Porifera — NEET Biology MCQs with Solutions
Free NEET Biology Porifera MCQs with step-by-step solutions (6 questions). Part of Animal Kingdom. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Porifera · easy · theory
Poriferans (sponges) are characterised by a water-transport (canal) system and special flagellated cells called:
A. Choanocytes (collar cells) ✓ Correct
B. Cnidoblasts
C. Nephridia
D. Flame cells
Solution: Choanocytes line the spongocoel/canals and drive the water current used for food, gas exchange and waste removal.
Q2 — Porifera · easy · theory
Sponges are supported by a skeleton of:
A. Cartilage
B. Chitin
C. Bone
D. Spicules or spongin fibres ✓ Correct
Solution: The sponge body is supported by calcareous/siliceous spicules or a network of spongin fibres.
Q3 — Porifera · medium · theory
The level of organisation in sponges is:
A. Cellular level ✓ Correct
B. Tissue level
C. Organ-system level
D. Organ level
Solution: Sponges show a cellular level of organisation with division of labour among cells, but no true tissues.
Q4 — Porifera · medium · theory
Water enters a sponge through minute pores called ______ and leaves through the ______:
A. Nephridiopores; mouth
B. Osculum; ostia
C. Ostia; osculum ✓ Correct
D. Blastopore; anus
Solution: Water enters via ostia into the spongocoel and exits via the osculum — the canal system.
Q5 — Porifera · hard · theory
Sponges are hermaphrodites and reproduce sexually by forming ______, and asexually by ______:
A. Conidia; sporulation
B. Seeds; budding
C. Larvae after internal fertilisation; fragmentation/gemmules ✓ Correct
D. External spores; binary fission only
Solution: Most sponges are bisexual with internal fertilisation and a larval stage; they also reproduce asexually by fragmentation/gemmules.
Q6 — Porifera · hard · theory
Examples Sycon, Spongilla and Euspongia belong to Porifera. Which statement is CORRECT?
A. They are mostly marine, asymmetrical or radially symmetrical, and sessile ✓ Correct
B. They are bilaterally symmetrical and free-swimming
C. They have a true coelom
D. They possess a nervous system
Solution: Sponges are mostly marine, sessile, and asymmetrical/radially symmetrical, lacking true tissues, coelom and nervous system.