Viruses are regarded as non-living because they

A. can niether reproduce asexually nor sexually

B. cannot survive in their respective enviroments

C. do not possess characteristics that can be transmitted from one generation to the next

D. can neither respire nor excrete

Which of the following pairs are fully adapted to terrestrial life?

A. Ferns and algae

B. Ferns and mosses

C. Bryophytes and flowering plants

D. Flowering plants and conifers

Which of these animals is radially symmetrical?

A. squid

B. Hydra

C. Snail

D. Cockroach

Which of the following has cones?

A. Angiosperms

B. Gymnosperms

C. Pteridophyte

D. Bryophyte

For effective functioning of a bird's quill feather, hooks fit on the ridge of the

A. Vane

B. rachis

C. barbules

D. barbs

Which of the following is NOT true of spirogyra?

A. Reproduces by conjugation

B. Reproduces by fragmentation

C. Consist of branched filaments

D. Consist of unbranched filaments

Which of the following lacks chaetae, tentacles and antennae?

A. Snail

B. Crab

C. Millipede

D. Earthworm

Incomplete metamorphosis occurs in the

A. butterfly

B. grasshopper

C. mosquito

D. housefly

Fishes are cold blooded because their body temperature is

A. constantly low

B. constantly high

C. dependent on that of their surroundings

D. regulated at will

When the original king and queen of termites die, they are replaced by

A. the king and queen of another colony

B. some adult reproductives from the same colony

C. some adult workers which are specially fed breed

D. developing nymphs nurtured as secondary reproductives