LIFE PROCESSES

1. How many pairs of salivary glands are found in humans?

• 2

• 3

• 6

• 4

The diagram shows the arrangement of cells inside the leaf of a green plant. (No cell contents are shown). Which cells normally contain chloroplasts

• 1 and 2

• 1 and 4

• 2 and 3

• d) 2 and 4

1. Which of the following structures is involved in gaseous exchange in woody stem of a plant?

• Stomata

• (a) Lenticel

• (c) Guard cell

1. Villi present on the internal wall of intestine help in the

• (a) emulsification of fats

• (a) breakdown of proteins

• absorption of digested food

• (a) digestion of carbohydrates

1. The diagram represents a section through the small intestine.

What is the role of the structure labelled X ?

• (a) They help to move the food along

• (a) They help to move the food along

• (a) They protect against bacteria

• (a) They move mucus over the surface

1. In which order do these events occur in human nutrition?

• (a) Digestion " ingestion " absorption " assimilation

• (a) Digestion " ingestion " assimilation " absorption

• (a) Ingestion " digestion " absorption " assimilation

• (a) Ingestion " digestion " assimilation " absorption

1. The diagram shows the human gut. Which numbered structures secrete digestive enzymes?

• ) 1, 2, 3 and 4

• 1, 2, 3 and 6

• ) 2, 3, 4 and 5

• (d) 2, 3, 5 and 6

Digestion of food in human starts from:

• Duodenum

• (b) Small intestine

• (c) Mouth

• (d) Large intestine

1. Assertion : in the daytime, CO₂ generated during respiration is used up for photosynthesis.

Reason : There is no CO₂ release during day.

• (a) Both A and R are true and R is the correct explanation of A.

• Both A and R are true but R is not the correct explanation of A.

• (a) A is true but R is false.

• (a) Both Assertion and Reason are false.

1. Assertion : Raw materials needed for photosynthesis are carbon dioxide, water and minerals.

Reason : Nutrients provide energy to an organism.

• (a) Both A and R are true and R is the correct explanation of A

• Both A and R are true but R is not the correct explanation of A

• (a) A is true but R is false.

• (a) A is false but R is true.

• (a) Both Assertion and Reason are false.