The carnassial teeth of a carnivorous animal consist of the

A. last upper premolar and the first lower molar

B. last upper molar and the last lower molar

C. first upper premolar and the lower molar

D. first upper molar and the first lower molar

Birds which are large with long straight pointed beaks, long necks and long legs are likely to be

A. insect eaters

B. fish catchers

C. nectar feeders

D. fruit eaters

A feature of the caste system of bees and termites ia that

A. the workers are sterile

B. the kings are bigger than the queens

C. only the worker perform duties

D. nuptial flight is performed by all members

The structure that is common in the embryos of mammals, amphibians, birds, fishes and reptiles and which is an evidence of their common ancestry is the

A. eye

B. chorion

C. allantois

D. gill-silts

Animals aestivate when the environment in which they live becomes

A. hot and dry

B. cold and wet

C. warm and humid

D. windy and snowy

Examples of organisms in which extracellular digestion occurs are?

A. fungus, loranthus and housefly

B. rhizopus, sponges and earthworm

C. roundworm, tapeworm and hydra

D. rhizopus, housefly and hydra

The mammalian erythrocytes differ from the leucocytes at maturity because the erythrocytes are

A. discoid and nucleated

B. discoid and enucleated

C. amoeboid and nucleated

D. amoeboid and enucleated

The presence of endoskeleton is characteristic of

A. invertebrata

B. vertebrata

C. insecta

D. coelenterata

The capture and digestion of insects by a pitcher plant is a special form of nutrition termed

A. autotrophic

B. heterotrophic

C. chemosynthetic

D. saprophytic

Which of the following statement is correct about the experiment?

A. The flask must be of the conical type

B. Caustic soda can be replaced with distilled water

C. The enclosed leaf will lose its green colour

D. The leaves outside the flask serve as control