10 Grade 1st semester review

Which of the structures from the alimentary canal absorbs most of the water ingested?

• Stomach

• Large Intestine

• Oesophagus

• Small Intestine

A decrease in which of the following factors would normally cause the

transpiration rate to increase?

• Stomatal density

• Light intensity

• Temperature

• Humidity

What is the effect on a plant of not having any root hairs?

• The plant absorbs less water from the soil. 

• The plant absorbs more water from the soil.

• The plant loses water to the soil.

• The plant loses mineral ions to the soil.

Which of the following is the role of root hairs in absorption? 

• To increase the surface area, maximising the rate of absorption of water

  and ions by osmosis.

• To increase the surface area, maximising the rate of absorption of water by

  osmosis and ions by active transport. 

• To decrease the surface area, maximising the rate of absorption of water

  and ions by osmosis.

• To decrease the surface area, maximising the rate of absorption of water by

  osmosis and ions by active transport.

Which is NOT correct about the leaf cuticle?

• It is a protective layer and it helps to reduce water loss from the leaf.

• It increases the surface area for faster diffusion of carbon dioxide into the

  leaf.

• It is transparent for light to enter palisade mesophyll cells.

• It is a waxy material produced by the epidermis cells.

Which of the following statements describing the function of hydrochloric acid

is correct? 

• Breaking down starch into maltose

• Breaking down lipids into glycerol and fatty acids

• Chemical digestion of proteins

• Creating best pH conditions for optimum activity of stomach enzymes

For which food, chemical digestion happens both in the mouth and in the duodenum?

• Glucose

• Protein

• Starch

• Fat

Which of the following enzymes digests starch?

• Amylase

• Protease

• Lipase

• Maltase

Which of the following is an example of chemical digestion?

• Breakdown of hard food into smaller pieces by chewing

• Emulsication of fats in the small intestine by bile 

• Breakdown of starch in the mouth by amylase

• Mixing the food with water in the stomach

What is the function of chlorophyll?

• To absorb sunlight 

• To synthesize carbohydrates from oxygen and water

• To store energy for the plants

• To fix carbon dioxide gas from the air