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Which of the following is a characteristic feature of sponges?
- a)Tissue level of organization
- b)Presence of Ostia
- c)Extracellular digestion
- d)Indirect development
Correct answer is option 'B'. Can you explain this answer?
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Which of the following is a characteristic feature of sponges?a)Tissue...
The characteristic feature of sponges (phylum Porifera) among the options provided is the presence of Ostia. Ostia are tiny pores or openings on the body of a sponge that allow water to enter its central cavity, called the spongocoel. These ostia are responsible for the filtration of water, which is a vital process for sponges to obtain food and oxygen.
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Which of the following is a characteristic feature of sponges?a)Tissue...
Tissue level of organization
Sponges are unique among animals in that they lack true tissues, organs, and organ systems. Instead, they have a cellular level of organization, where cells are loosely aggregated to form a simple body structure. This means that sponges do not have specialized tissues performing specific functions like in other animals.
Presence of Ostia
One of the characteristic features of sponges is the presence of small pores called ostia on their body surface. These ostia allow water to enter the sponge and flow through its body cavity, where food particles and oxygen are filtered out. The ostia are essential for the sponge's feeding and respiration processes.
Extracellular digestion
Sponges exhibit intracellular digestion, where food particles are engulfed by specialized cells called choanocytes and digested within the cell. This is in contrast to extracellular digestion, where food is broken down outside the cells. Sponges rely on choanocytes to capture and digest food particles, highlighting their unique feeding strategy.
Indirect development
Sponges typically undergo indirect development, where they have a larval stage that undergoes metamorphosis to become an adult sponge. This larval stage allows for dispersal to new habitats before settling and growing into the sessile adult form. Indirect development is a common feature among many marine invertebrates, including sponges.
Sponges are unique among animals in that they lack true tissues, organs, and organ systems. Instead, they have a cellular level of organization, where cells are loosely aggregated to form a simple body structure. This means that sponges do not have specialized tissues performing specific functions like in other animals.
Presence of Ostia
One of the characteristic features of sponges is the presence of small pores called ostia on their body surface. These ostia allow water to enter the sponge and flow through its body cavity, where food particles and oxygen are filtered out. The ostia are essential for the sponge's feeding and respiration processes.
Extracellular digestion
Sponges exhibit intracellular digestion, where food particles are engulfed by specialized cells called choanocytes and digested within the cell. This is in contrast to extracellular digestion, where food is broken down outside the cells. Sponges rely on choanocytes to capture and digest food particles, highlighting their unique feeding strategy.
Indirect development
Sponges typically undergo indirect development, where they have a larval stage that undergoes metamorphosis to become an adult sponge. This larval stage allows for dispersal to new habitats before settling and growing into the sessile adult form. Indirect development is a common feature among many marine invertebrates, including sponges.
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Which of the following is a characteristic feature of sponges?a)Tissue level of organizationb)Presence of Ostiac)Extracellular digestiond)Indirect developmentCorrect answer is option 'B'. Can you explain this answer?
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