In the internal structure of plants, a wide pith in the centre is common to

A. dicot stems and monocot stems

B. dicot stem and monocot roots

C. dicot roots and monocot roots

D. dicot roots and monocot stems

The gall bladder of mammal has a duct connected to the

A. liver

B. duodenum

C. small intestine

D. pancreas

All living cells require water because it

A. is a medium for all metabolic reactions

B. is a medium that neutralizes the acids in cells

C. is the main source of energy for the cell

D. prevents the development of dieseases in cells

The breakdown of fats and oils into simpler absorbable compounds is catalyzed by the group of enzymes called

A. lipases

B. hydrolases

C. amylases

D. peptidases

Yam is used in this set-up because it

A. is a permeable to the salt solution

B. is a plant material

C. acts as a storage organ

D. acts as a semi-permeable membrane

Which of the following results is to be expected if the set up is left for several hours?

A. decrease in the size of the yam

B. movement of the salt solution into the water

C. decrease in the volume of water inside the yam

D. movement of water from the salt solution into the yam

The surface of an alveolus in a mammal is well supplied with tiny blood vessels known as

A. arterioles

B. venules

C. arteries

D. capillaries

The anaerobic fermentation of a glucose molecule yields

A. 38 ATP molecules

B. 2 ATP molecules and alcohol

C. pyruvic acid and alcohol

D. water and carbon (IV) oxide

The opening of the stoma is controlled by the

A. presence of a pore

B. increase in solute concentration in the guard cells

C. presence of guard cells

D. decrease in solute concentration in the guard cells

The sweat gland is the structure labelled

A. I

B. II

C. III

D. IV