Which of the following groups has a closed circulatory system?
Annelids, such as earthworms, have a closed circulatory system where blood flows inside vessels.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Mollusca and Echinodermata
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Which of the following is a characteristic feature of phylum Mollusca?
Molluscs possess a radula, a file-like rasping organ used for feeding.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Mollusca and Echinodermata
Which of the following structures is responsible for osmoregulation in crustaceans?
Green glands (also called antennal glands) in crustaceans help regulate salt and water balance.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Arthropoda
Which of the following characteristics is incorrect about mammals?
Mammals are warm-blooded (endothermic), not cold-blooded (ectothermic).
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Arthropoda
Which of the following statements about amphibians is correct?
Amphibians have a three-chambered heart, consisting of two atria and one ventricle.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Arthropoda