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Question

Read the following statements:

i) Spider and mosquito possess compound eye
ii) Jelly fishes possess cnidoblasts but comb-jellies lack them.
iii) Aphids increase crop yield
iv) All animals having true coelom are characterized by the presence of bilateral symmetry usually , tube -within-tube body plan, presence of mesoderm and true segmentation
v) The animals of the phylum porifera have originated from colonial protozoans.
Which of the above statements are correct?


A
i, ii, v
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B
iii, iv, v
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C
iii, ii
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D
ii, iii
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Solution

The correct option is A i, ii, v
Correct statements are - 

i) Spider and mosquito possess compound eye. The eyes of most insects, which are composed of many light sensitive elements, each having its own reflective system and each forming a portion of an image.

ii) Jelly fishes possess cnidoblasts but comb-jellies lack them. Because cnidoblasts is the feature of coelenterata (cnidaria) and comb-jellies comes under phylum etenophora.

iii) Colonial protozoans live together. This colony may consist of many individual protists of the same species. The animals of the phylum porifera have originated from colonial protozoans.

Biology

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