Q7. Regarding Porifera, which statements are correct? (i) They have cellular level of organisation. (ii) They have choanocytes or collar cells. (iii) They reproduce only asexually.
Correct Answer: (a)
Porifera have cellular level of organisation and choanocytes, but they reproduce both sexually and asexually.
Q8. The excretory organ in aschelminthes is:
Correct Answer: (c)
Aschelminthes have an excretory tube for excretion.
Q9. Assertion: Platyhelminthes are acoelomates.
Reason: They lack a body cavity between the gut and body wall.
Correct Answer: (a)
Platyhelminthes lack a body cavity, making them acoelomates.
Q10. The exoskeleton in arthropods is made up of:
Correct Answer: (b)
The exoskeleton in arthropods is made up of chitin.
Q11. The circulatory system in arthropods is:
Correct Answer: (a)
Arthropods have an open circulatory system.
Q12. Match the phylum with their support structure:
Q13. Regarding Platyhelminthes, which statements are correct? (i) They have flame cells. (ii) They are acoelomates. (iii) They have a complete digestive system.
Correct Answer: (a)
Platyhelminthes have flame cells and are acoelomates, but their digestive system is incomplete.
Q14. Match the phylum with their level of organisation:
Q15. Assertion: Hemichordates have a proboscis gland.
Reason: The proboscis gland is the excretory organ.
Correct Answer: (a)
Hemichordates have a proboscis gland as their excretory organ.
Q16. The respiratory organ in molluscs is:
Correct Answer: (a)
Molluscs have gills for respiration.
Q17. Assertion: Hemichordates have a stomochord.
Reason: The stomochord is a structure similar to notochord.
Correct Answer: (a)
Hemichordates have a stomochord, which is similar to the notochord.
Q18. Assertion: Arthropods have chitinous exoskeleton.
Reason: The exoskeleton is made up of chitin and provides protection.
Correct Answer: (a)
Arthropods have a chitinous exoskeleton for protection.
Q19. In sponges, cells are arranged as loose cell aggregates. This organisation is called:
Correct Answer: (b)
Sponges (Porifera) show cellular level of organisation, where cells form loose aggregates with minimal division of labour.
Q20. The excretory organ in hemichordates is:
Correct Answer: (c)
The proboscis gland is the excretory organ in hemichordates.
Q21. The excretory organ in molluscs is:
Correct Answer: (c)
Molluscs have kidneys for excretion.
Q22. Assertion: Cnidarians show tissue level of organisation.
Reason: In cnidarians, cells performing the same function are arranged into tissues.
Correct Answer: (a)
Cnidarians have cells arranged into tissues, which is tissue level of organisation.
Q23. The respiratory organ in insects is:
Correct Answer: (c)
Insects have tracheae for respiration.
Q24. Animals such as Platyhelminthes that lack a body cavity are referred to as:
Correct Answer: (c)
Platyhelminthes are acoelomates because they lack any coelomic space between gut and body wall.
Q25. Cnidoblasts containing nematocysts are used for defence and prey capture in:
Correct Answer: (b)
Cnidoblasts (stinging cells) are diagnostic of phylum Coelenterata (Cnidaria) and occur on tentacles and body.
Q26. Regarding Echinodermata, which statements are correct? (i) They have a water vascular system. (ii) They have a complete digestive system. (iii) They have a kidney.
Correct Answer: (a)
Echinoderms have a water vascular system and a complete digestive system, but not a kidney.
Q27. Regarding Arthropoda, which statements are correct? (i) They have jointed appendages. (ii) They have an open circulatory system. (iii) They have a water vascular system.
Correct Answer: (a)
Arthropods have jointed appendages and an open circulatory system, but not a water vascular system.
Q28. Regarding Annelida, which statements are correct? (i) They have nephridia. (ii) They have a closed circulatory system. (iii) They have a complete digestive system.
Correct Answer: (d)
Annelids have nephridia, a closed circulatory system, and a complete digestive system.
Q29. Regarding Chordata, which statements are correct? (i) They have a notochord. (ii) They have a dorsal hollow nerve cord. (iii) They have a complete digestive system.
Correct Answer: (d)
Chordates have a notochord, a dorsal hollow nerve cord, and a complete digestive system.
Q30. Assertion: Arthropods have compound eyes.
Reason: Compound eyes are made up of many ommatidia.
Correct Answer: (a)
Arthropods have compound eyes made up of many ommatidia.
Q31. Animals with ectoderm and endoderm only, and an intervening mesoglea, are termed:
Correct Answer: (b)
Coelenterates and ctenophores are diploblastic with ectoderm, endoderm and an acellular mesoglea in between.
Q32. Match the phylum with their diagnostic structures:
Q34. Regarding Porifera, which statements are correct? (i) They have choanocytes. (ii) They have a water transport system. (iii) They have a complete digestive system.
Correct Answer: (a)
Porifera have choanocytes and a water transport system, but not a complete digestive system.
Q35. Match the phylum in Column-I with their excretory organs in Column-II:
Q37. Regarding Echinodermata, which statements are correct? (i) They have a water vascular system. (ii) They have a complete digestive system. (iii) They have a kidney.
Correct Answer: (a)
Echinoderms have a water vascular system and a complete digestive system, but no kidney.
Q38. Regarding Coelenterata, which statements are correct? (i) They have cnidoblasts. (ii) They have a water vascular system. (iii) They have a complete digestive system.
Correct Answer: (a)
Coelenterata have cnidoblasts and an incomplete digestive system, but not a water vascular system.
Q39. Metameric segmentation in the body is first clearly observed in:
Correct Answer: (c)
Annelids show true metamerism, with external and internal segmentation into similar units.
Q40. Regarding Ctenophora, which statements are correct? (i) They have comb plates. (ii) They have a water vascular system. (iii) They have a complete digestive system.
Correct Answer: (b)
Ctenophora have comb plates.
Q41. The presence of a water vascular system is a characteristic feature of:
Correct Answer: (c)
Echinoderms possess a water vascular system which helps in locomotion, feeding, and respiration.
Q42. Assertion: Hemichordates are bilaterally symmetrical.
Reason: Their body can be divided into equal left and right halves by only one plane.
Correct Answer: (a)
Hemichordates are bilaterally symmetrical.
Q43. Assertion: Molluscs have a mantle cavity.
Reason: The cavity is formed by the mantle and contains gills.
Correct Answer: (a)
Molluscs have a mantle cavity formed by the mantle and containing gills.
Q44. Flame cells are found in:
Correct Answer: (b)
Flame cells are excretory organs in flatworms (Platyhelminthes).
Q46. Assertion: Aschelminthes have a complete digestive system.
Reason: Their alimentary canal has two openings, mouth and anus.
Correct Answer: (a)
Aschelminthes have a complete digestive system with two openings.
Q47. Regarding Hemichordata, which statements are correct? (i) They have a stomochord. (ii) They have a proboscis gland. (iii) They have a water vascular system.
Correct Answer: (a)
Hemichordates have a stomochord and a proboscis gland, but not a water vascular system.
Q49. Choanocytes or collar cells are characteristic of:
Correct Answer: (b)
Sponges possess choanocytes lining spongocoel and canals which drive water current and capture food.
Q50. Regarding Arthropoda, which statements are correct? (i) They have jointed appendages. (ii) They have an open circulatory system. (iii) They have a complete digestive system.
Correct Answer: (d)
Arthropods have jointed appendages, an open circulatory system, and a complete digestive system.
Q51. Regarding Ctenophora, which statements are correct? (i) They have comb plates. (ii) They have a water vascular system. (iii) They have a complete digestive system.
Correct Answer: (b)
Ctenophora have comb plates and a complete digestive system, but not a water vascular system.
Q52. Match the phylum in Column-I with their specialized cells/structures in Column-II:
Correct Answer: (c)
Chordates have kidneys for excretion.
Q54. Regarding Coelenterata, which statements are correct? (i) They have cnidoblasts. (ii) They have a complete digestive system. (iii) They have a water vascular system.
Correct Answer: (a)
Coelenterata have cnidoblasts, but their digestive system is incomplete and they do not have a water vascular system.
Q55. Assertion: Echinoderms have radial symmetry.
Reason: Their adult body can be divided into equal halves by any plane passing through the centre.
Correct Answer: (a)
Echinoderms have radial symmetry in adults.
Q56. Malpighian tubules are the excretory organs in:
Correct Answer: (b)
Malpighian tubules are the excretory organs in arthropods.
Q59. Regarding Hemichordata, which statements are correct? (i) They have a stomochord. (ii) They have a proboscis gland. (iii) They have a complete digestive system.
Correct Answer: (d)
Hemichordates have a stomochord, a proboscis gland, and a complete digestive system.
Q60. Regarding Mollusca, which statements are correct? (i) They have a mantle cavity. (ii) They have a kidney. (iii) They have a complete digestive system.
Correct Answer: (d)
Molluscs have a mantle cavity, a kidney, and a complete digestive system.
Q61. Regarding Annelida, which statements are correct? (i) They have nephridia. (ii) They have a closed circulatory system. (iii) They have a water vascular system.
Correct Answer: (a)
Annelids have nephridia and a closed circulatory system, but not a water vascular system.
Q62. Assertion: Cnidarians have a gastrovascular cavity.
Reason: The cavity is used for both digestion and circulation.
Correct Answer: (a)
Cnidarians have a gastrovascular cavity for digestion and circulation.
Q63. Comb plates used for locomotion are present in:
Correct Answer: (b)
Ctenophores bear eight rows of ciliated comb plates that help in swimming.
Q64. Assertion: Chordates have a dorsal hollow nerve cord.
Reason: The nerve cord is located on the dorsal side and is hollow.
Correct Answer: (a)
Chordates have a dorsal hollow nerve cord.
Q65. Assertion: Aschelminthes are pseudocoelomates.
Reason: Their body cavity is not lined by mesoderm.
Correct Answer: (a)
Aschelminthes are pseudocoelomates with a body cavity not lined by mesoderm.
Q66. Match the phylum in Column-I with their characteristic features in Column-II:
Q67. Assertion: Molluscs have a calcareous shell.
Reason: The shell is secreted by the mantle.
Correct Answer: (a)
Molluscs have a calcareous shell secreted by the mantle.
Q68. Assertion: Cnidarians have two body forms, polyp and medusa.
Reason: Polyps are sessile and medusae are free-swimming.
Correct Answer: (a)
Cnidarians have two body forms, polyp and medusa.
Q69. Regarding Coelenterata, which statements are correct? (i) They have tissue level of organisation. (ii) They have cnidoblasts. (iii) They have a complete digestive system.
Correct Answer: (a)
Coelenterata have tissue level of organisation and cnidoblasts, but their digestive system is incomplete.
Q70. Regarding Chordata, which statements are correct? (i) They have a notochord. (ii) They have a dorsal hollow nerve cord. (iii) They have a water vascular system.
Correct Answer: (a)
Chordates have a notochord and a dorsal hollow nerve cord, but not a water vascular system.
Q71. Regarding Aschelminthes, which statements are correct? (i) They have an excretory tube. (ii) They have a complete digestive system. (iii) They have a water vascular system.
Correct Answer: (a)
Aschelminthes have an excretory tube and a complete digestive system, but not a water vascular system.
Q72. Match the following features:
Column-I
Column-II
A. Annelida
1. Closed circulatory system
B. Arthropoda
2. Open circulatory system
C. Mollusca
3. Kidney
D. Echinodermata
4. Water vascular system
Correct Answer: (a)
Annelida: closed circulatory; Arthropoda: open circulatory; Mollusca: kidney; Echinodermata: water vascular system.
Q73. Assertion: Arthropods have jointed appendages.
Reason: Their appendages are segmented and jointed for locomotion.
Correct Answer: (a)
Arthropods have jointed appendages for locomotion.
Q74. Assertion: Echinoderms have calcareous ossicles.
Reason: The ossicles form the endoskeleton and provide support.
Correct Answer: (a)
Echinoderms have calcareous ossicles for support.
Correct Answer: (c)
Nephridia are the excretory organs in annelids.
Q81. Regarding Porifera, which statements are correct? (i) They have choanocytes. (ii) They have a complete digestive system. (iii) They have a water transport system.
Correct Answer: (b)
Porifera have choanocytes and a water transport system, but not a complete digestive system.
Q82. Assertion: Porifera show cellular level of organisation.
Reason: In sponges, cells are loosely aggregated with minimal division of labour.
Correct Answer: (a)
Sponges have loosely aggregated cells and show minimal division of labour, which is cellular level of organisation.
Q83. The excretory organ in echinoderms is:
Correct Answer: (d)
Echinoderms do not have a distinct excretory system.
Q84. Regarding Aschelminthes, which statements are correct? (i) They are pseudocoelomates. (ii) They have an excretory tube. (iii) They have a complete digestive system.
Correct Answer: (d)
Aschelminthes are pseudocoelomates, have an excretory tube, and a complete digestive system.
Q85. Regarding Platyhelminthes, which statements are correct? (i) They have flame cells. (ii) They have a complete digestive system. (iii) They have a water vascular system.
Correct Answer: (a)
Platyhelminthes have flame cells, but their digestive system is incomplete and they do not have a water vascular system.
Q86. Match the phylum with their representative animal:
Q93. Assertion: Arthropods have an open circulatory system.
Reason: Their blood is pumped out of the heart and bathes the cells directly.
Correct Answer: (a)
Arthropods have an open circulatory system with blood bathing the cells directly.
Q94. Regarding Ctenophora, which statements are correct? (i) They have comb plates. (ii) They are bioluminescent. (iii) They have a complete digestive system.
Correct Answer: (a)
Ctenophora have comb plates and are bioluminescent, but their digestive system is incomplete.
Q95. Regarding Mollusca, which statements are correct? (i) They have a mantle cavity. (ii) They have a kidney. (iii) They have a water vascular system.
Correct Answer: (a)
Molluscs have a mantle cavity and a kidney, but not a water vascular system.
Q96. The body cavity that is lined by mesoderm on all sides is called:
Correct Answer: (c)
True coelom is a mesoderm-lined body cavity, found in annelids, arthropods, molluscs, echinoderms, hemichordates and chordates.