Unit 1 MCQ Revision Test

Which substances do plants use for photosynthesis?

• Water, oxygen, and energy

• Water, carbon dioxide, and sunlight

• Carbon dioxide, nitrogen, and energy

• Oxygen, glucose, and water

What is the role of chlorophyll in photosynthesis?

• It absorbs carbon dioxide from the air

• It captures sunlight to provide energy for the reaction

• It helps plants absorb water from the soil

• It produces oxygen for the plant

Which equation correctly represents photosynthesis?

• Oxygen + glucose → water + carbon dioxide

• Carbon dioxide + oxygen → glucose + water

• Water + carbon dioxide → glucose + oxygen

• Water + oxygen → carbon dioxide + glucose

Where does photosynthesis mainly take place in a plant?

• Roots

• Stem

• Leaves

• Flowers

What are the products of photosynthesis?

• Water and carbon dioxide

• Oxygen and glucose

• Oxygen and nitrogen

• Glucose and carbon dioxide

Why is photosynthesis important for most living organisms?

• It provides food and oxygen

• It removes nitrogen from the air

• It produces carbon dioxide for plants

• It helps animals breathe carbon dioxide

How do animals obtain energy from plants?

• By absorbing sunlight

• By breathing in oxygen

• By eating plants or other animals that have eaten plants

• By performing photosynthesis

How does oxygen enter the Earth's atmosphere?

• It is released as a waste product of photosynthesis

• It is produced by animals during respiration

• It comes from the breakdown of glucose in plants

• It is formed when carbon dioxide is absorbed by the soil

What type of energy is stored in glucose produced by photosynthesis?

• Heat energy

• Chemical energy

• Light energy

• Mechanical energy

Which layer of the leaf contains the most chloroplasts?

• Upper epidermis

• Spongy layer

• Palisade layer

• Lower epidermis