This process is called intracellular digestion. Intracellular & Extracellular Digestion - Video & Lesson ... Sponges are not equipped with a digestive system. sponges This is the intracellular digestion wherein organisms phagocytize food particles. A higher rate of intracellular digestion is thus only made possible by a rise in cell numbers, which has led to an enlarged surface area of bilaterian gut regions with intracellular digestion. Lacking a true digestive system, sponges depend on the intracellular digestive processes of their choanocytes for their energy intake. In intracellular digestion, digestion happens contained in the cells. Polyp – It is a sessile and cylindrical form like Hydra, Adamsia, etc. 4 Sponges have an endoskeleton that functions to maintain their shape. Bath sponge belongs to the class 2. Digestion in sponges is | Biology Questions Sponges and Cnidarians Amoebocytes take up nutrients repackaged in food vacuoles of the choanocytes and deliver them to other cells within the sponge. Sponges appear to represent an early stage of multicellularity in the animal clade. Although they have specialized cells for particular functions, they lack true tissues in which specialized cells are organized into functional groups. Sponges are similar to what might have been the ancestor of animals: colonial, flagellated protists. The mesohyl is a gelatinous extracellular matrix with support proteins (collagen and/or spongin), support particles (spicules-hard support proteins made of calcium carbonate or silica), and ameobocytes. Food is taken into the gastrovascular cavity, enzymes are secreted into the cavity, and the cells lining the cavity absorb the nutrient products of the extracellular digestive process. Key Areas Covered 1. (ii) Intracellular digestion is limited by lysosome availability. Example … Extracellular Phototropic Digestion is a process in which saprobionts feed by secreting enzymes through the cell membrane onto the food. St. Francis Xavier University Digestion Protists and sponges employ intracellular digestion—they do not have a gut. Sponges have just a few specialized cells and no digestive system. Video Solution: The digestion of food in sponges is. (9) Cephalopoda present only pinocytosis. Digestion is intracellular. Fertilisation is external. Intracellular digestion Invertebrate feeding and digestion • Invertebrates can either have intracellular or extracellular digestion: – Intracellular meaning that food is digested within each individual cell of the organism. Food enters in coelenteron, also termed gastrovascular cavity. Intracellular digestion . Digestion in hydra is first extracellular, then intracellular. The enzymes catalyze the digestion of the food ie diffusion, transport, osmotrophy or phagocytosis.Since digestion occurs outside the cell, it is said to be extracellular. The spatial constraints of surface enlargement are overcome by extracellular digestion. Cnidarians exhibit two basic body forms called polyp and medusa (Figure 4.6). . _____ 2)Water in sponges circulates inward via pores into a cavity called the _____ and exits through the opening called the _____. Sponges do not have a digestive system. Intracellular digestion. Sponges do not have a digestive system. sponges; cnidarians; flatworms (planarian) annelids (earthworm) vertebrates; 2. Parazoa includes 3. Ans----> a. B. Examiners report. Figure 1. 1. 1) Name the flagellated cell in phylum Porifera that propels water through the body of the sponge. Phylum Aschelminthes1.6 8. whereas, the In starfish, digestion takes place outside the body with the help of digestive enzymes. In intracellular digestion, digestion occurs inside the cells. Intracellular digestion can also defined as the process in which animals that lack a digestive tract bring food items into the cell due to the reason of digestion for nutritional needs. They have either a cavity, a tube, or a food canal which receives the ingested food. The limit of this type of digestion is that food particles must be smaller than individual cells. In intracellular digestion, digestion occurs inside the cells. Extracellular bacterial pathogens do not invade cells instead, they proliferate in the extracellular environment which is enriched with body fluids. Expert AG Home ... 10.Digestion in sponges is. The pyloric caeca contain many phagocytes which probably take … The staggering potential of living tissues for auto-regeneration may be restricted/impaired by an age-related decline in the number and quality of host stem cell/progenitor populations, by the innately low regenerative capacity of certain tissues or by the negative effect of inflammation on wound repair [].In an effort to compensate for such … Digestion is both extracellular and intracellular. Cnidarians perform extracellular digestion, with digestion completed by intracellular digestive processes. Ultrastructure of the sponge embryo suggests direct transmission through … What is characteristic of poriferan digestion? Two different types of digestion exist: (1) Intracellular (2) Extracellular. Hydra is a member of Phylum Cnidaria, included under a group of organisms called COELENTERATA . Digestive enzymes (biological catalysts), which mix with the food in the gut, reduce the size of the food particles. Assertion: In ctenophores, digestion is chiefly extracellular. The former is a sessile and cylindrical form like Hydra, Adamsia, etc. Lacking a true digestive system, sponges depend on the intracellular digestive processes of their choanocytes for their energy intake. ~Information can be transmitted from these extracellular structures to the cytoplasm. Markscheme. 35. The food is broken down into simpler substances in digestive system and the nutrients are absorbed by the cells. 2. Intracellular digestion takes place in unicellular organisms such as protozoans while extracellular digestion occurs in animals and fungi. A large quantity of food is absorbed by a sponge, and it can use several litres of water a day. Digestion – both extracellular and intracellular. This type of digestion, which occurs in the cavity outside the gastrodermis cells, is called extracellular digestion. 1. Intracellular digestion occurs in both choanocytes and thesocytes. What is autophagic intracellular digestion? Loricifera: extracellular digestion is likely, considering the presence of gland and zymogen cells; intracellular digestion is unstudied. In the digestive system, food is broken down into simpler compounds, and nutrients are absorbed by the cells. 2. Digestion is extracellular and intracellular; Corals have calcium carbonate skeleton; A polyp is a sessile and cylindrical form, e.g Hydra, Adamsia; Medusa is an umbrella-shaped free-swimming form, e.g. The process of digestion that takes place within the cell is referred to as intracellular digestion. Food is taken into the gastrovascular cavity , enzymes are secreted into the cavity, and the cells lining the cavity absorb the nutrient products of the extracellular digestive process. Lacking a true digestive system, sponges depend on the intracellular digestive processes of their choanocytes for their energy intake. The limit of this type of digestion is that food particles must be smaller than individual cells. Sponges, Cnidarians and Platyhelminthes BIOL 1407 Invertebrates Animals without backbones Most animals Sponges Porifera ≠ clade Two possible phyla: Silicea (most sponges) Calcarea Photo Credit: BIOL 1407 Student Characteristics of Sponges Cellular organization Radial or no symmetry Photo Credit: BIOL 1407 Student Characteristics of Sponges Filter feeders Aquatic Sessile Photo … … In extracellular digestion , the breakdown of food materials into small molecules occurs outside the cell in the lumen of the alimentary canal or on the decaying organic materials. The enzymes catalyze the digestion of thefood into molecules small enough to be taken up by passivediffusion, transport, or phagocytosis. Intracellular digestion, extra cellular digestion and feeding strategy adopted by animals Intracellular digestion: In simple animals (protitsts and sponges) some cells take in whole food particles directly from the environment by diffusion, active transport and endocytosis and break them down with enzymes to obtain nutrients. Their digestive system starts in the mouth where it then leads to the pharynx and then into a temporary space that take in food particles by phagocytosis. This process is known as intracellular digestion. Trypsin and chymotrypsin are associated with extracellular proteolytic activity in adults, but the activity of cathepsins reflects total acid proteolytic activity in juveniles. Chou JC, Lieu FK, Ho DM, et al. Sponges are different from other animals since they present only intracellular digestion. CaM is a calcium-binding protein formed by 148 amino acid residues with a weight of 16.7 kDa. Answer:(a) intracellular. Intracellular and Extracellular Digestion As discussed above, unicellular organisms and animals with simple digestive systems tend to utilize intracellular digestion or … 2019;19(15):1305–1317. In many freshwater habitats, green algae form intracellular symbioses with a variety of heterotrophic host taxa including several species of freshwater sponge. Animals : Features & Basis of Classification1.2 Body Plan1.3 Notochord1.4 2. Class Turbellaria is free-living, aquatic, carnivorous, and has an incomplete digestive tract. D. A bacterium. This is intracellular digestion. The development of an anus and complete digestive tract first occurred in the: A) sponges. → They are lined by choanocytes (collar cells). Digestion in Echinodermata: In echinoderms the digestion is extracellular as well as intracellular. Figure 1. As water enters a sponge, Page 2 it carries tiny organisms such as bacteria and protists. Thanks, You will receive a call shortly. Digestive enzymes are secreted by the surrounding cytoplasm into the food vacuole. Academia.edu is a platform for academics to share research papers. Bioluminescence (the property of a living organism to emit light) is well-marked in ctenophores. Digestive enzymes are secreted by the surrounding cytoplasm into the food vacuole. Intracellular digestion refers to the digestive phenomenon that occurs inside the cell as a result of phagocytosis and is typical in simple organisms. Is digestion in a sponge extracellular or intracellular? @alwaysclau: “It’s quite an experience hearing the sound of your voice carrying out to a over 100 first year…” In extracellular digestion, digestion occurs outside the cells. • Examples: Sponges – Extracellular means that digestion occurs inside a digestive tract or cavity, then absorbed into the body. A) Comparing digestion between sponges and cnidarians, what are the benefits of developing extracellular digestion in a gastrovascular cavity for the evolution of larger animals? 13.2.2 Extracellular digestion (extra = outside) Digestion occurs outside the cell. In extracellular digestion, digestion occurs outside the cells. This happens because the food ingested by these beings is made, initially in the light of the tube, thus being extracellular. 2021;264(Pt 1):128604. They do not have a digestive system nor do they release digestive enzymes in the spongocoel to cause the extracellular break down of nutrients. The digestion occurs outside the cell in the cavity of alimentary canal. In sponges, cells take in whole food particles inside directly from the environment by various processes like diffusion, active transport, endocytosis. Once the food reaches inside, it breaks down with enzymes to obtain nutrients. This process is known as intracellular digestion. This type of digestion also occurs in Cnidarians, protists etc. Sponges accomplish digestion by digesting food particles within specialized cells, a process known as intracellular digestion. All free-living unicellular animals carry out intracellular digestion. Let’s first dissect the ‘anatomy’ of our word “intracellular.” The prefix intra means “on the inside” or “within,” and the suffix cellular literally refers to our cells. The remaining speci- Fig. Intracellular In sponges, cells take in whole food particles inside directly from the environment by various processes like diffusion, active transport, endocytosis. Alimentary canal and digestive system is complete, digestive glands are present and digestion is extracellular. d.first extracellular then intracellular. Digestion takes place in specialized compartments for all of the following reasons except that A) the animalʹs body must be protected from its own digestive enzymes. Food is taken into the gastrovascular cavity, enzymes are secreted right into the cavity, and also the cell lining the cavity absorb the nutrient products of the extracellular digestive process. (10) Extracellular digestiondom-inates in most annelids, but intracellular digestion plays a role in leeches. (10) Extracellular digestiondom-inates in most annelids, but intracellular digestion plays a role in leeches. What is Intracellular Digestion In some of the simplest forms of life (protists and sponges), cells take in food and break it down via enzymes within the cell. Bacterial cells are about one-tenth the size of eukaryotic cells and are typically 0.5–5.0 micrometres in length. Solution: Digestive tract in Ctenophores consists of mouth, pharynx or stomodaeum, stomach or infundibulum, anal canals and two anal pores. Chemosphere. It takes place inside the cells. Fertilisation is external [fertilization occurs outside the body] with indirect development [zygote → larvae → animal]. Sponges are very efficient at removing food particles from water. A sponge. Contents1 Animal Kingdom Class 11 Notes Biology Chapter 41.1 1. Sponges are very efficient at removing food particles from water. Sponges are different from other animals in that they can only use intracellular digestion. Moreover, is digestion in sponges intracellular or extracellular? The limit of this type of digestion is that food particles must be smaller than individual cells. The digestion of food occurs within the cell. a.only intracellular. Curr Top Med Chem. b.first intracellular and then extracellular. Sexes are not separate and reproduction takes place only by sexual means. The cell body of the choanocyte is embedded in mesohyl but protruding into the spongocoel is a mesh-like collar surrounding a single flagellum. However, a few species are visible to the unaided eye—for example, Thiomargarita namibiensis is up to half a millimetre long and Epulopiscium fishelsoni reaches 0.7 mm. ... Porifera Ctenophora They are asymmetrical. Gas exchange, circulation, and excretion occur by diffusion between cells and the water. Digestion is both extracellular and intracellular. just extracellular digestion: 3. Acid phosphatase and cathepsins are found in lysosomes and have an important role in intracellular digestion (Boucaud-Camou et al., 1985; Perrin et al., 2004). Cladorhiza sp. STAT3: a potential drug target for tumor and inflammation. Softer sponges have … Hu YS, Han X, Liu XH. This protein plays multifunctional roles in the translation of intracellular messages (Klee and Vanaman, 1982). The extracellular digestion allows food that was eaten previously to keep on being digested while more food is eaten. Collar cells on the inside of the central cavity trap these food particles and digest them. Cnidarians perform extracellular digestion, with digestion completed by intracellular digestive processes. The guide clearly states that the cell wall is an extracellular structure; therefore candidates could not have confused the intracellular space with it. Digestion in Leucosolenia and other sponges is only extracellular only intracellular first extracellular, then intracellular first intracellular, then extracellular Switch Flag Bookmark 6. The limit of this type of digestion is that food particles must be … Cnidarians perform extracellular digestion, with digestion completed by intracellular digestive processes. The chunks get digested within the food vacuoles. Digestion occurs outside the cell. Digestion = chemical breakdown of matter into components that the body can use. In these animals, heart is situated at the ventral side of the body, just beneath the alimentary canal, and blood flows from anterior to posterior side in dorsal blood vessel. Sponges are completely different from different animals in that they’ll solely use intracellular digestion. intracellular digestion. What is Extracellular Digestion. Extracellular digestion refers to a form of digestion where the breakdown of materials into smaller components takes place outside the cell. Thus, the hydrolytic enzymes are secreted on the food materials via the cell membrane. In animals, extracellular digestion occurs inside the lumen of the alimentary canal. Intracellular digestion. A fern. • On the other hand, extracellular digestion occurs outside the cell. Most multicellular organisms practice this. Intracellular vs. Extracellular Digestion Some of the simplest forms of life (protists and sponges) have no gut and thus carry out intracellular digestion. As water enters a sponge, Page 2 it carries tiny organisms such as bacteria and protists. 1. Cellular mechanisms of extracellular and intracellular digestion. MAUDE - … They are radially symmetrical. Digestive systems and extracellular digestion are key animal features, but their emergence during early animal evolution is currently poorly understood. Gas exchange, circulation, and excretion occur by diffusion between cells and the water. ... digestion of cnidarians … Once the food reaches inside, it breaks down with enzymes to obtain nutrients. In protists and sponges, cells take in food and break it down via enzymes within the cell. Ultrastructural evidence is presented for intracellular specimens from the Manon cruise were either pre- phagocytic digestion of the bacteria by the sponge and served for cytology or frozen. Similar intracellular digestion occurs in sponges, some coelentrates, ctenophores and turbellarians. The digestion in Ctenophores is both extracellular and intracellular. Thereof, the place does digestion happen in sponges? Lipase can be achieved from several sources, animal, vegetable, and microbiological. Digestion is extracellular and intracellular. Then there comes another kind of digestion, known as extracellular digestion. Done by sponges whereas, the The digestion mixtures were applied to Glutathione Sepharose or loaded to a HisTrap excel column to remove released GTS-tag or His 6-tag, and the flow-through fractions containing the target proteins were collected. We would like to show you a description here but the site won’t allow us. The water-current system, therefore, is efficient, in spite of the lack of a nervous coordinating centre. Tiny food particles are taken into the cell directly from the environment by diffusion or endocytosis. Sponges do not have a digestive system. Cnidarians do extracellular digestion, v digestion perfect by intracellular digestive processes. ~All extracellular structures form barriers to separate adjacent cells. Phylum Mollusca Animal Kingdom Class 11 Biology Notes Chapter 4 Pdf free download was designed by expert teachers from the latest edition of NCERT books to get good marks in […] Ultrastructural evidence of intracellular digestion of the symbionts and the stable C and N values suggest that the sponge obtains a significant portion of its nutrition from the symbionts. Digestion is extracellular and intracellular . It takes place either in the lumen of the digestive system, in a gastric cavity … What is intracellular process? Collar cells on the inside of the central cavity trap these food particles and digest them. C) molluscs. ... extracellular digestion. Is there an excretory system in sponges? The enzymes catalyze the digestion of thefood into molecules small enough to be taken up by passivediffusion, transport, or phagocytosis. These sponges perform important ecological roles in their habitats, and the poriferan:green algae partnerships offers unique opportunities to study the evolutionary origins and ecological persistence of endosymbioses. In many forms there is a combination of the two processes (extracellular and intracellular). c.only extracellular. Extracellular digestion takes place outside the cell. D) cnidarians. Extracellular digestion is a process in whichsaprobionts feed by secreting enzymes through the cell membraneonto the food. Large bush of cladorhizid sponges, approximately 40 cm high, observed from the submersible 'Nautile' at Coelenteron is the body cavity of diploblastic organism hydra. The spatial constraints of surface enlargement are overcome by extracellular digestion. Cells then engulf the partly digested food, and an intracellular process similar to that of sponges completes digestion. The possession of a gut allows extracellular digestion of … Digestion is extracellular and intracellular. ~Extracellular structures store energy in the form of polysaccharides for subsequent metabolism by the cell. The main difference between intracellular and extracellular digestion is that intracellular digestion occurs inside the food vacuoles within the cell whereas extracellular digestion occurs outside the cell in the lumen of the alimentary canal or on the decaying organic materials. 16:This about sponges is true (a) one mouth, innumerable exits (b) innumerable mouths, one exit (c) large spacious stomach (d) spicules are composed of … The digestion occurs outside the cell in the cavity of alimentary canal. All animals (excluding sponges) carry out extracellular digestion. Since there are mouth and anal pores present, the digestive tract is complete. B. Extracellular digestion. Physiological Processes in Sponges Lacking a true digestive system, sponges depend on the intracellular digestive processes of their choanocytes for their energy intake. 2. Skeleton – Some of the cnidarians – corals have a skeleton composed of calcium carbonate. Are sponges intracellular or extracellular? Buffering processes may include an uptake through the microsomal Ca 2+ , mitochondrial uniporter, or the Mg 2+ -ATPase [ 14 ]. Digestion is the process of breaking down food into nutrients. It occurs due to the expulsion of enzymes to the extracellular medium, followed by the absorption of the transported material. An intracellular decrease can be seen due to buffering processes. Extracellular = outside the cell. Vibrio cholerae) but adhere to epithelial surfaces and cause disease by secreting potent toxins. Basic body forms – Cnidarians exhibit two basic body forms called polyp and medusa. 3. The disintegrated smaller chunks of food are now engulfed by nutritive-muscle cells by means of pseudopodia. A sponge body is an assembly of cells embedded in an extracellular matrix and supported by a skeleton of minute needlelike spicules and protein. In nuclidae the digestion is entirely extracellular and is carried out with the help of digestive enzymes (Owen, 1956). Cnidarians exhibit two basic body forms called polyp and medusa (Figure 4.6). This is intracellular digestion. C) specialization of the sites of digestion promotes efficiency. Digestive enzymes are poured over the food, and the - Intracellular digestion. Digestion starts inside this cavity but only incomplete breakdown of food takes place here. Intracellular digestion Intracellular digestion. C. A flatworm. 4. Reason: Digestive tract is incomplete in ctenophores. The enzymes catalyze the digestion of the food ie diffusion, transport, osmotrophy or phagocytosis.Since digestion occurs outside the cell, it is said to be extracellular. Bacillus anthracis is a Gram-positive and rod-shaped bacterium that causes anthrax, a deadly disease to livestock and, occasionally, to humans.It is the only permanent pathogen within the genus Bacillus.Its infection is a type of zoonosis, as it is transmitted from animals to humans. Step by step video, text & image solution for " The digestion of food in sponges is " by Biology experts to help you in doubts & scoring excellent marks in Class … Leveret is young one of eagle hawk deer None of these Answer 7. What digestion takes place in porifera? Most common method of reproduction in sponges is 4. Do sponges have an incomplete digestive system? Three main types of digestion are recognized: extracellular, intracellular, and membrane mediated (see Figure 1). 1. B) the environment of digestion must protect the food. Extracellular Digestion. 2. Academia.edu is a platform for academics to share research papers. Extracellular digestion refers to special molecules breaking down food for molecules outside the cell, contrasted by intracellular digestion which happens inside the cell. It takes place either in the lumen of the digestive system, in a gastric cavity … The process of digestion that takes place outside the cell in the cavity of the alimentary canal is called intercellular digestion. - Extracellular digestion. Digestion in sponges is (a) intracellular (b) intercellular (c) both a and b (d) extracellular. Moulting in snakes is done by shedding comified cells stratified germinativum epidermis dermis D) all of the above (a-c). Digestion takes place inside the cells in intracellular digestion. They have either a cavity, a tube, or a food canal which receives the ingested food. extracellular digestion the breakdown of food in compartments that are continuous with the outside of the animals's body, devour much larger pieces of food advanced extracellular digestion (above sponges) gastrovascular cavity, functions in digestion as well as in the distibution of nutrients throughout the body alimentary canal Their digestive system is intracellular, meaning that their digestive system occurs inside a cell. Although the process is called intracellular digestion, the food material is actually separated from the rest of the cellular material by a membrane which it can cross after digestion. The digested food diffuses into the cytoplasm. → Food gathering, respiratory exchange and removal of wastes occurs through water canal system. (ii) Intracellular digestion is limited by lysosome availability. Figure: Digestion in amoeba. Extracellular Phototropic Digestion is a process in which saprobionts feed by secreting enzymes through the cell membrane onto the food. Intracellular digestion. It takes place outside the cells, within the digestive tube. Extracellular digestion. The uses of microbial lipase market is estimated to be USD 425.0 Million in 2018 and it is projected to reach USD 590.2 Million by 2023, growing at a CAGR of 6.8% from 2018. Digestion in sponges is September 27, 2021 by LiveMCQs Digestion in sponges is (A) intracellular (B) intercellular (C) both a and b (D) extracellular Answer: intracellular Animal Kingdom NEET Questions And Answers –Set-8 1. Extracellular bacteria. Some of the cnidarians, e.g., corals have a skeleton composed of calcium carbonate. The food is damaged down into easier substances in digestive system and the vitamins are absorbed by the cells. This partly digested material is then engulfed (phagocytized) by cells or absorbed; digestion is then completed within the gut cells. - Intracellular- food is broken down when it is in the cell (engulfed by phagocytosis), nutrients are absorbed. Non-Chordata1.5 5. Aurelia (jellyfish) In some coelenterates, e.g. Regulation of extracellular and intracellular prolactin on cell proliferation and survival rate through GHR/JAK2/STAT3 pathway in NSCLC. Alginate is a popular hydrogel used in bioprinting processes due its biocompatibility, various choices of crosslinking and bioprinting methods, low price, and ease of use in the creation of 3D structures (Ozbolat and Hospodiuk, 2016).It is a polysaccharide made of alternating β-d-mannuronate (M) and its C-5 epimer α-l-guluronate (G) units (Jungst et al., 2016). The limit of this type of digestion is that food particles must be smaller than individual cells. Digestion begins when the enzymes break down food inside the cavity in an extracellular (outside the cell) process. Intracellular = inside the cell. 14. In contrast, in extracellular digestion, the breakdown of food via enzymes usually occurs within a special organ or cavity. 7. What digestion takes place in porifera? Extracellular digestion takes place outside of the cells. Digestion intracellular. . Filter feeding or filtering food particles from water is how they get food. The cell engulfs food in the phagocyte and liquids in the pinocyte. Sponges eat plankton, bacteria, and detritus (remains of living things in water). Intracellular digestion. Be able to explain the advantages of a 1-way digestive tract. (9) Cephalopoda present only pinocytosis. 1. B) A) Explain how bilateral symmetry contributed to motion, predation, cephalization (the evolution of a head and brain) and increased the diversity of animals. The food is broken down into simpler substances in digestive system and the nutrients are absorbed by the cells. C) intracellular digestion. Loricifera: extracellular digestion is likely, considering the presence of gland and zymogen cells; intracellular digestion is unstudied. They have one of two types. Some of the cnidarians, e.g., corals have a skeleton composed of calcium carbonate. Food vacuoles contain hydrolytic enzymes that break down food. The food is broken down into simpler substances in digestive system and the nutrients are absorbed by the cells. Since there are mouth and anal pores present, the digestive tract is complete. When considering the evolutionary origins of the digestive system, the ventral epithelial cells of Placozoa that phagocytose microorganisms trapped in the cleft between the animal and the substrate, may present an anatomical scenario from which more complex digestive systems evolved (Smith and … Extracellular and intracellular digestion The cnidarians and in most flatworms there is a particular case, that is, the two processes. Intracellular 1 In extracellular digestion, digestion occurs outside the cells. The food is broken down into simpler substances in... 2 In intracellular digestion, digestion occurs inside the cells. 3 Sponges do not have a digestive system. The food is directly ingested by them with the help of choanocytes which is then... More ... Show Answer. In intracellular digestion, digestion occurs inside the cells. 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