Thrombocytes are blood cells responsible for initiating

A. phagocytosis of bacteria

B. synthesis of ribosomes

C. clotting of the blood

D. immunity to certain infectious diseases

E. removal of carbondioxide from tissues.

When gametes from pure breeding parents with contrasting features such as tallness and shortness are
involved in monohybrid cross, the offspring in the first filial generation are usually

A. pure breed

B. heterozygous dominant

C. homozygous recessive

D. mutants

E. co-dominant

A pair of genes which controls a trait is described as

A. dominant

B. recessive

C. allele

D. variant

E. hybrid

The genetic make-up of an organism is described as its

A. phenotype

B. genotype

C. character

D. chromosome

E. allele

The precondition for transfusion of blood to an accident victim is

A. seeking the consent to his parents

B. ascertaining the religious belief of the victim

C. cross-matching the blood group of the donor with that of the accident victim

D. curing the donor of any disease traced in his blood

E. rewarding the donor with food and money.

Adaptive radiation as illustrated by the variety of forms in insects can be regarded as

A. behavioral modification

B. a case of rapid population growth

C. a physiological process

D. an evidence of evolution

E. a population control mechanism

Which of the following statements about the modifications of pentadactyl fore-limb is not correct?

A. Wings are modified for flying in birds

B. Flippers are modified for grasping in sharks

C. Legs are modified for walking and running in antelopes

D. Arms are adapted for grasping and holding in human beings

E. Flippers are modified for swimming in whales

The process by which plants and animals are modified in structure, physiology and behaviour in order to survive is known as

A. evolution

B. adaptation

C. succession

D. aggregation

E. hibernation

What is the significance of the bee dance to other bees?

A. Warning signal

B. Presence of food

C. Mating signal by the male

D. Soaring the enemies away

E. Time for nuptial flight

Which of the following statements is not associated with the theory of natural selection?

A. There is a struggle for existence

B. There is competition among the offsprings

C. The weaker offsprings are eliminated

D. Food and other needs are abundant

E. Nature selects those that survive to reproduce their kind