Which of the following characteristic features always holds true for the corresponding group of animals?

  • Viviparous Mamalia
  • Posess a mouth with an upper and lower jaw Chordata
  • 3-chmbered heart with one incompletely divided ventricle Reptilia
  • Cartiliginous- endoskeleton Chondrichthyes

C.

3-chmbered heart with one incompletely divided ventricle Reptilia

Except for crocodilians, which have a four-chambered heart, all reptiles have a three-chambered heart consisting of two atria and one ventricle. The chamber called the right atrium receives deoxygenated, or 'spent' blood returning from the body tissues.

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Which of the following features is not present in Periplaneta americana?

  • Indeterminate and radical cleavage during embryonic development

  • Exoskeleton composed of N-acetylglucosamine

  • Metamerically segmented body

  • Metamerically segmented body


A.

Indeterminate and radical cleavage during embryonic development

Cockroach has determinate cleavage during emembryonic development and it develops into nymph, which is a fully developed cockroach.

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The eyes of Octopus and eyes of cat show different patterns of structure, yet they perform a similar function. This is an example of 

  • homologous organs that have evolved due to convergent evolution

  • homologous organs that have evolved due to divergent evolution

  • analogous organs that have evolved due to convergent evolution

  • analogous organs that have evolved due to convergent evolution


C.

analogous organs that have evolved due to convergent evolution

The analogous organs are not anatomically similar structures through they perform similar structure though they perform similar functions, Hence, analogous structures are a result of convergent evolution different structures evolving for the same function and hence, having similarity.
Homologous organs developed along different due to adaptations to different needs. This is divergent evolution and the structures are homologous.

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Which of the following features is not present in the phylum-Arthropoda?

  • Metameric segmentation

  • Parapodia

  • Jointed appendages

  • Jointed appendages


B.

Parapodia

Parapodia are present in annelids.

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Which one of the following characteristics is not shared by birds and mammals?

  • Breathing using lungs

  • Viviparity

  • Warm-blooded nature

  • Warm-blooded nature


B.

Viviparity

Mammals are viviparous while birds are oviparous. 

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