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Practice each question, then open the answer or worked solution.
Find out incorrect sentence
Answer is (d) Monerans have a well-defined nucleus
Explanation:
Monerans include single-celled prokaryotes, actinomycetes and photosynthetic blue-green algae. Monerans don’t have well-defined nuclei and cell organelles.
Which among the following has specialised tissue for the conduction of water?
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)
Answer is (c) (iii) and (iv)
Explanation:
Thallophytes and Bryophytes don’t have specialized tissues for water conduction, whereas Pteridophytes and Gymnosperms have specialized tissues for the conduction of water.
Which among the following produces seeds?
Answer is (d) Gymnosperms
Explanation:
Gymnosperms are flowerless plants that produce seeds. But the seeds are not covered within an ovary and are hence called “naked seeds”.
Which one is a true fish?
Answer is (c) Dogfish
Explanation:
Jellyfish is a coelenterate, starfish belongs to Echinodermata, and silverfish is an Arthropod.
Which among the following is exclusively marine?
Answer is (b) Echinodermata
Explanation:
Echinodermata is exclusively found in the marine environment, whereas Porifera, Molluscs and Pisces can be found in both marine and freshwater.
Which among the following has an open circulatory system?
(a) (i) and (ii)
(b) (iii) and (iv)
(c) (i) and (iii)
(d) (ii) and (iv)
Answer is (a) (i) and (ii)
Explanation:
Annelida and Coelenterata have a closed circulatory system, whereas Arthropods and Mollusca have an open circulatory system.
In which group of animals is the coelom filled with blood?
Answer is (a) Arthropoda
Explanation:
Annelida, Nematoda and Echinodermata don’t have blood, and Arthropods’ coelom is filled with blood.
Elephantiasis is caused by
Answer is (a) Wuchereria
Explanation:
Wuchereria is a human parasite which causes Elephantiasis. Elephantiasis is spread through mosquitos.
Pinworm is a common intestinal parasite and causes enterobiasis
Planarians are non-parasitic flatworms
Liver flukes are flatworms that cause liver rot in Humans.
Which one is the most striking or (common) character of the vertebrates?
Answer is (a) Presence of notochord
Explanation:
The presence of triploblastic condition, presence of gill pouches, and presence of coelom are found in both vertebrates and invertebrates, but Notochord is exclusively present in invertebrates.
Which among the following have scales?
(a) (i) and (iii)
(b) (iii) and (iv)
(c) (ii) and (iii)
(d) (i) and (ii)
Answer is (c) (ii) and (iii)
Explanation:
Amphibians and mammals don’t have scales on their body, whereas Pisces and reptiles have scales on their body.