Revision : Nutrition

Organisms which prepare food for themselves using simple naturally available raw materials are referred to as

• heterotrophs

• autotrophs

• parasites

• saprophytes.

In the absence of which of the following, will photosynthesis not occur in leaves?

• Guard cells

• Chlorophyll

• Vacuole

• Space between cells

Which of the following statements is/are correct?

(i) All green plants can prepare their own food.

(ii) Most animals are autotrophs.

(iii) Carbon dioxide is not required for photosynthesis.

(iv) Oxygen is liberated during photosynthesis.

Choose the correct answer from the options below.

• (i) and (iv)

• (ii) only

• (ii) and (iii)

• (i) and (ii)

Pitcher plant traps insects because it

• is a heterotroph

• grows in soils which lack in nitrogen

• does not have chlorophyll

• has a digestive system like human beings.

The term that is used for the mode of nutrition in yeast, mushroom and bread mould is

• autotrophic

• insectivorous

• saprophytic

• parasitic.

When we observe the lower surface of a leaf through a magnifying lens we see numerous small openings. Which of the following is the term given to such openings?

• Stomata

• Lamina

• Midrib

• Veins

Two organisms are good friends and live together. One provides shelter, water and nutrients while the other prepares and provides food. Such an association of organisms is termed as

• saprophyte

• parasite

• autotroph

• symbiosis.

Hydrochloric acid is secreted by

• linings of small intestine

• inner lining of stomach

• pancreas

• lining of liver

Which of the following pair of teeth differ in structure but are similar in function?

• Canines and incisors

• Molars and premolars

• Incisors and molars

• Premolars and canines

The swallowed food moves downwards in the alimentary canal because of

• force provided by the muscular tongue

• the flow of water taken with the food

• gravitational pull

• the contraction of muscles in the wall of foodpipe