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

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

• Breathing using lungs

• Viviparity

• Warm-blooded nature

• Warm-blooded nature

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

• Metameric segmentation

• Parapodia

• Jointed appendages

• Jointed appendages

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

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

A senentary sea anemone gets attached to the shell lining of hermit crab. The association is 

• ectoparasitism

• symbiosis

• commensalism

• commensalism

A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is:

• Eptatretus

• Myxine

• Neomyxine

• Neomyxine

8.

The chitinous exoskeleton of arthropods is formed by the polymerisation of

• Keratin sulphate and chondraitin sulphate

• D-glucosamine

• N-acetyl glucosamine

• N-acetyl glucosamine

Metagenesis refers to

• Presence of different morphic forms

• Alternation of generation between asexual and sexual phases of an organism

• Occurrence of a drastic change in form during post-embyonic development

• Occurrence of a drastic change in form during post-embyonic development

Five Kingdom system of classification suggested by RH Whittaker is not based on

• presence or absence of a well-defined nucleus

• mode of reproduction

• Mode of nutrition

• Mode of nutrition