Homework Practice

Printable assignment

Nutrition in Plants: Food-Making Basics

Food-Making Basics

Question 1mcq

Which statement best describes autotrophic nutrition in green plants?

A.Plants make their own food from simple substances using light energy.

B.Plants obtain ready-made food from animals only.

C.Plants absorb cooked food from soil.

D.Plants do not need any source of energy.

Question 2mcq

A plant kept in darkness for several days remains alive for some time but grows weak. Which idea explains this best?

A.It can continue photosynthesis normally without light.

B.It may use stored food for a while, but cannot keep making food without light.

C.It becomes heterotrophic like an animal immediately.

D.It absorbs sunlight from soil instead of air.

Question 3mcq

In an experiment, iodine turns a leaf blue-black after the leaf was kept in sunlight. What does this mainly show?

A.The leaf contains only water.

B.The leaf has no chlorophyll.

C.The leaf contains starch made during photosynthesis.

D.The leaf has absorbed iodine as food.

Question 4mcq

A student covers part of a leaf with black paper and leaves the plant in sunlight. After the starch test, only the uncovered part turns blue-black. What is the best conclusion?

A.Carbon dioxide is not needed by plants.

B.Water destroys starch in leaves.

C.Black paper adds starch to leaves.

D.Light is needed for photosynthesis.

Question 5mcq

Which word equation correctly summarizes photosynthesis?

A.Carbon dioxide + water

\xrightarrow{light, chlorophyll}

glucose + oxygen

B.Oxygen + glucose

\xrightarrow{darkness}

carbon dioxide + water

C.Water + minerals

\xrightarrow{soil}

oxygen + protein only

D.Carbon dioxide + oxygen

\xrightarrow{roots}

water + starch

Question 6mcq

A student says, 'Oxygen is a raw material for photosynthesis because plants release it.' What is the error?

A.Oxygen is never involved with plants.

B.Oxygen is a product, not a raw material, of photosynthesis.

C.Carbon dioxide is the product released by photosynthesis.

D.Sunlight is produced by chlorophyll.

Question 7mcq

Why are leaves often called the food factories of plants?

A.They absorb all minerals directly from air.

B.They digest insects in every plant.

C.They contain chlorophyll and are well placed to capture light for photosynthesis.

D.They store all waste products permanently.

Question 8mcq

A variegated leaf has green and white patches. After starch testing, which part is most likely to turn blue-black?

A.Only the white part because it reflects light.

B.Both parts equally because colour does not matter.

C.Neither part because leaves cannot make starch.

D.The green part because it contains chlorophyll.

Question 9mcq

Which pair lists two raw materials used in photosynthesis?

A.Carbon dioxide and water

B.Oxygen and glucose

C.Chlorophyll and starch

D.Sunlight and iodine

Question 10mcq

Why do stomata matter in photosynthesis?

A.They pump food from the leaf into the soil.

B.They allow gases such as carbon dioxide to enter and oxygen to leave the leaf.

C.They turn water directly into chlorophyll.

D.They absorb sunlight better than chlorophyll.