In the tapeworm the suckers on the scolex are used for

A. sucking the blood of the host

B. holding fast to the host

C. reproduction

D. locomotion

A feature which adapts birds to flight is the possession of

A. scaly legs

B. light bones

C. two walking legs

D. a pointed beak

The nephridia in the earthworm form part of the

A. reproductive system

B. respiratory system

C. circulatory system

D. excretory system

Which of the following disease is rarely spread by a housefly?

A. Yellow fever

B. Dysentry

C. Typhoid fever

D. Poliomyelitis

Which type of the following cells is thin-walled and living at maturity?

A. Collenchyma

B. Sieve tube

C. xylem vessel

D. sclerenchyma

The mode of nutrition in which digestion is extracellular is

A. holophytic

B. parasitic

C. holozoic

D. saprophytic

The first step in the process of photosynthesis is the

A. activation of the chlorophyll

B. photolysis of water

C. reduction of carbondioxide

D. formation of sugar

Which of the following food substance will produce a brick-red colour when warmed with Benedict's solution?

A. Glucose

B. Starch

C. Egg white

D. Maltose

The organ which secretes digestive enzymes as well as hormones is the

A. liver

B. salivary gland

C. pancreas

D. spleen

The vilius in the small intestine is significant because it

A. increase the surface area for absorption

B. increase the surface area for digestion

C. assists in mixing digested food

D. assists in filtering undigested food