QUESTION BANK

CLASS VII SCIENCE

CHAPTER X: LIFE PROCESSES IN PLANTS

Direct Questions Assertion / Reason Correct / Incorrect HOTS Challenging

DIRECT QUESTIONS

The process by which green plants prepare their own food is called:

A. Respiration

B. Photosynthesis

C. Transpiration

D. Absorption

Answer: B. Photosynthesis

Which of the following is an autotroph?

A. Mushroom

B. Human

C. Green plant

D. Cuscuta (Dodder)

Answer: C. Green plant

The tiny pores present on the surface of leaves for gas exchange are called:

A. Chlorophyll

B. Stomata

C. Guard cells

D. Vessels

Answer: B. Stomata

Which pigment gives green color to the leaves?

A. Hemoglobin

B. Chlorophyll

C. Anthocyanin

D. Xanthophyll

Answer: B. Chlorophyll

Plants take in carbon dioxide from the air through:

A. Roots

B. Stems

C. Stomata

D. Flowers

Answer: C. Stomata

The raw materials required for photosynthesis are:

A. Carbon dioxide and Water

B. Oxygen and Water

C. Nitrogen and Water

D. Carbon dioxide and Oxygen

Answer: A. Carbon dioxide and Water

Solar energy is captured by the leaves with the help of:

A. Chlorophyll

B. Guard cells

C. Xylem

D. Phloem

Answer: A. Chlorophyll

During photosynthesis, plants release:

A. Carbon dioxide

B. Nitrogen

C. Oxygen

D. Hydrogen

Answer: C. Oxygen

The food prepared by plants is stored in the form of:

A. Glucose

B. Starch

C. Proteins

D. Fats

Answer: B. Starch

Which of the following is a parasite plant?

A. Pitcher plant

B. Cuscuta

C. Algae

D. Lichen

Answer: B. Cuscuta

Insectivorous plants grow in soil that is deficient in:

A. Calcium

B. Nitrogen

C. Phosphorus

D. Magnesium

Answer: B. Nitrogen

The relationship in which two organisms live together and share shelter and nutrients is:

A. Parasitism

B. Saprotrophism

C. Symbiosis

D. Autotrophism

Answer: C. Symbiosis

Lichens are an association between:

A. An alga and a fungus

B. A fungus and a bacterium

C. An alga and a bacterium

D. Two different fungi

Answer: A. An alga and a fungus

Fungi that grow on dead and decaying matter are called:

A. Parasites

B. Saprotrophs

C. Autotrophs

D. Insectivores

Answer: B. Saprotrophs

The ultimate source of energy for all living organisms is:

A. Plants

B. Water

C. Sun

D. Oxygen

Answer: C. Sun

Which part of the plant is called the "food factory"?

A. Root

B. Stem

C. Leaf

D. Flower

Answer: C. Leaf

Water and minerals are transported to the leaves by:

A. Stomata

B. Chlorophyll

C. Vessels (Xylem)

D. Phloem

Answer: C. Vessels (Xylem)

The synthesis of food in plants occurs in the presence of:

A. Only Water

B. Only Sun

C. Chlorophyll and Sunlight

D. Only Carbon dioxide

Answer: C. Chlorophyll and Sunlight

Pitcher plant is an example of:

A. Parasite

B. Saprotroph

C. Insectivorous plant

D. Symbiotic plant

Answer: C. Insectivorous plant

Rhizobium bacteria are found in the root nodules of:

A. Cereal plants

B. Leguminous plants

C. Aquatic plants

D. Desert plants

Answer: B. Leguminous plants

Which of the following is a product of photosynthesis?

A. Solar energy

B. Carbohydrate

C. Carbon dioxide

D. Nitrogen

Answer: B. Carbohydrate

Green patches in ponds or stagnant water bodies are:

A. Fungi

B. Algae

C. Lichens

D. Bacteria

Answer: B. Algae

What is the role of Rhizobium in soil?

A. It produces chlorophyll.

B. It converts atmospheric nitrogen into a soluble form.

C. It absorbs carbon dioxide.

D. It helps in transpiration.

Answer: B. It converts atmospheric nitrogen into a soluble form.

Mushroom is an example of:

A. Autotroph

B. Parasite

C. Saprotroph

D. Insectivore

Answer: C. Saprotroph

Which of the following tests is used to detect the presence of starch in leaves?

A. Iodine test

B. Litmus test

C. Acid-base test

D. Flame test

Answer: A. Iodine test

ASSERTION AND REASON

A. Both A and R are true and R is the correct explanation of A.

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

C. A is true but R is false.

D. A is false but R is true.

Assertion (A): Photosynthesis is essential for life on Earth.

Reason (R): It provides food and oxygen to almost all living organisms.

Answer: A. Both A and R are true and R is the correct explanation of A.

Assertion (A): Cuscuta is an autotroph.

Reason (R): It does not have chlorophyll and takes ready-made food from the host plant.

Answer: D. A is false but R is true.

Assertion (A): Leguminous plants do not require nitrogenous fertilizers.

Reason (R): Rhizobium bacteria in their roots fix atmospheric nitrogen.

Answer: A. Both A and R are true and R is the correct explanation of A.

Assertion (A): Leaves other than green also perform photosynthesis.

Reason (R): They contain chlorophyll but it is masked by other pigments.

Answer: A. Both A and R are true and R is the correct explanation of A.

Assertion (A): In lichens, the alga provides shelter to the fungus.

Reason (R): The alga prepares food by photosynthesis.

Answer: D. A is false but R is true (The fungus provides shelter).

CORRECT / INCORRECT STATEMENTS

Which of the following statements is INCORRECT?

A. Solar energy is converted into chemical energy during photosynthesis.

B. Carbon dioxide is released during photosynthesis.

C. Plants which synthesize their food themselves are called autotrophs.

D. Oxygen is produced during photosynthesis.

Answer: B. Carbon dioxide is released during photosynthesis.

Identify the CORRECT statement:

A. Saprotrophs have chlorophyll.

B. Pitcher plant is completely heterotrophic.

C. Algae are autotrophic organisms.

D. Respiration in plants occurs only at night.

Answer: C. Algae are autotrophic organisms.

Which of the following about stomata is CORRECT?

A. They are surrounded by guard cells.

B. They are present only on the upper surface of leaves.

C. They help in the absorption of minerals.

D. They do not allow water vapor to escape.

Answer: A. They are surrounded by guard cells.

Find the INCORRECT statement:

A. Rhizobium can make its own food.

B. Legumes provide food and shelter to Rhizobium.

C. Fungi can be both useful and harmful.

D. Starch is a type of carbohydrate.

Answer: A. Rhizobium can make its own food.

HOTS (HIGHER ORDER THINKING SKILLS)

Why does the color of a leaf kept in the dark for 72 hours not turn blue-black with iodine?

A. The chlorophyll is destroyed.

B. The starch has been used up by the plant and no new starch was made.

C. The leaf has died.

D. Iodine does not react in the dark.

Answer: B. The starch has been used up by the plant and no new starch was made.

Why do insectivorous plants trap insects if they are green and can perform photosynthesis?

A. To get energy.

B. To obtain nitrogen which is missing in the soil they grow in.

C. To protect themselves from being eaten.

D. Because they cannot absorb water.

Answer: B. To obtain nitrogen which is missing in the soil they grow in.

How do desert plants perform photosynthesis if they have scales or spines instead of leaves?

A. They do not perform photosynthesis.

B. Photosynthesis is carried out by the green stems.

C. They absorb food from other plants.

D. They only perform it during the rain.

Answer: B. Photosynthesis is carried out by the green stems.

Farmers often grow leguminous crops in rotation with other crops. Why?

A. To make the soil colorful.

B. To naturally replenish the nitrogen content of the soil.

C. To kill pests.

D. To use less water.

Answer: B. To naturally replenish the nitrogen content of the soil.

If all green plants disappear from Earth, what will happen?

A. Oxygen levels will increase.

B. Life will not be possible as there will be no food or oxygen.

C. Only animals that eat meat will survive.

D. The Earth will become very cold.

Answer: B. Life will not be possible as there will be no food or oxygen.

CHALLENGING QUESTIONS

Which of the following organisms can prepare food using chemical energy (chemosynthesis) instead of light?

A. Algae

B. Certain bacteria

C. Fungi

D. All plants

Answer: B. Certain bacteria

The chemical equation for photosynthesis is:

A. $6CO₂ + 6H₂O \rightarrow C₆H₁₂O₆ + 6O₂$

B. $C₆H₁₂O₆ + 6O₂ \rightarrow 6CO₂ + 6H₂O$

C. $6CO₂ + 6O₂ \rightarrow C₆H₁₂O₆ + 6H₂O$

D. $6H₂O + 6O₂ \rightarrow C₆H₁₂O₆ + 6CO₂$

Answer: A. $6CO₂ + 6H₂O \rightarrow C₆H₁₂O₆ + 6O₂$

Which of the following is a micronutrient for plants?

A. Nitrogen

B. Potassium

C. Iron

D. Phosphorus

Answer: C. Iron

The association of fungus with the roots of higher plants is called:

A. Lichen

B. Mycorrhiza

C. Rumen

D. Nodules

Answer: B. Mycorrhiza

In the absence of photosynthesis, which gas will decrease significantly in the atmosphere?

A. Carbon dioxide

B. Nitrogen

C. Oxygen

D. Argon

Answer: C. Oxygen