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NEET • BIOLOGY • ANIMAL KINGDOM
Animal kingdom practice · Easy
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61
Easy
61 of 63
Understanding
+4 | -1
Statement I : Sponges exhibit cellular level of organization
Statement II : Division of labour occurs among the cells
Statement II : Division of labour occurs among the cells
View answer and explanation
Correct option: B
Both SI & SII are correct
Option B (Both SI & SII are correct) is correct because sponges have cellular level organization and exhibit division of labor among their cells.
Solution approach
- Correct Answer + Core Reason: Both SI & SII are correct. Sponges have cellular organization and division of labor.
Step-by-Step Solution:
Step 1: Analyze Statement I: Sponges exhibit cellular level of organization. This is true; sponges are at the cellular level of organization.
Step 2: Analyze Statement II: Division of labour occurs among the cells. This is also true; different cells in sponges perform different functions.
Step 3: Therefore, both statements are correct.
Why other options are wrong:
- Option A: Both statements are correct, so this is incorrect.
- Option C: Statement II is correct, so this is incorrect.
- Option D: Statement I is correct, so this is incorrect.
Key Concepts:
- Cellular level of organization
- Division of labor
- Sponge characteristics
Memory Aids:
- Sponges = Cellular + Division of Labor
Quick Tips:
- Remember that sponges are the simplest animals and have a cellular level of organization.
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Easy
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Remembering
+4 | -1
Which of the following are also known as collar cells?
View answer and explanation
Correct option: A
Choanocytes
Option A (Choanocytes) is correct because choanocytes, also known as collar cells, are flagellated cells lining the interior of sponges that create water currents and capture food particles.
Solution approach
- Correct Answer + Core Reason: Choanocytes. They are flagellated collar cells that line the interior of sponges.
Step-by-Step Solution:
Step 1: Define each cell type in sponges.
Step 2: Choanocytes - Flagellated collar cells that line the interior of sponges and create water currents.
Step 3: Pinocytes - Flattened cells that form the outer layer of sponges.
Step 4: Thesocytes - Storage cells for reserve food.
Step 5: Cnidoblast - Cells that produce cnidocytes (stinging cells), found in Cnidarians, not sponges.
Step 6: Choanocytes are also known as collar cells.
Why other options are wrong:
- Option B: Pinocytes - These cells form the outer layer of the sponge.
- Option C: Thesocytes - These cells store food reserves.
- Option D: Cnidoblast - These cells are found in Cnidarians, not sponges.
Key Concepts:
- Sponge Cell Types
- Choanocytes (Collar Cells)
Memory Aids:
- Choanocytes: Think of "choana" (funnel) referring to the collar shape.
Quick Tips:
- Remember the specific function of each cell type in sponges.
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Easy
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Understanding
+4 | -1
From the following statements select the wrong one.
View answer and explanation
Correct option: C
Animals belonging to phylum-Porifera are exclusively marine
Option C (Animals belonging to phylum-Porifera are exclusively marine) is correct because while most Porifera are marine, some species inhabit freshwater environments.
Solution approach
- Correct Answer + Core Reason: Animals belonging to phylum-Porifera are exclusively marine. Some sponges live in freshwater.
Step-by-Step Solution:
Step 1: Recall the characteristics of each statement.
Step 2: Millipedes have two pairs of legs per segment.
Step 3: Prawns have two pairs of antennae.
Step 4: Nematocysts are characteristic of Cnidaria.
Step 5: Most sponges are marine, but some live in freshwater.
Step 6: Therefore, the wrong statement is that animals belonging to phylum-Porifera are exclusively marine.
Why other options are wrong:
- Option A: Millipedes do have two pairs of appendages per segment.
- Option B: Prawns do have two pairs of antennae.
- Option D: Nematocysts are indeed characteristic of Cnidaria.
Key Concepts:
- Porifera habitat
- Millipede anatomy
- Prawn anatomy
- Nematocysts
Memory Aids:
- Remember that not all sponges are marine.
Quick Tips:
- Pay attention to words like \"exclusively\" or \"always,\" as they often indicate incorrect statements.
Revision notes and key takeaways
Review ANIMAL KINGDOM in your textbook or class notes, then use this set to check your understanding.
Showing 61-63 of 63 questions