BIO 101 | Study Mode

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Question 351
A
Ventral central Leech nervous system
B
Pharyngeal gill slits Chamaeleon absent in embryo
C
Ventral heart Scorpion
D
Post-anal tail Octopus.
Explanation
The animals mentioned in the options are invertebrates. These invertebrates have central nervous system and dorsal heart. They lack pharyngeal slits and post anal tail.

Correct option: A
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Question 352
A
(ii), (iii) and (iv)
B
(b) only (i) and (iv)
C
only (i) and (ii)
D
(i), (iii) and (iv).
Explanation
Reptiles have two auricles and a partly divided ventricle except crocodiles which have four-chambered heart. Obelia shows metagenesis i.e. alternation of generations which may be defined as a phenomenon in which diploid asexual phase alternates with haploid sexual phase. Lemur has a thecodent teeth i.e., the teeth are embedded in the sockets of the jaw bone.

Correct option: D

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