Photosynthesis Revision Notes

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Questions and Answers

What is the primary role of chlorophyll in the process of photosynthesis?

To transport water from the roots to the leaves

To absorb light energy and convert it into chemical energy (correct)

To produce oxygen as a byproduct

To facilitate gas exchange through stomata

Which of the following is NOT a requirement for photosynthesis to occur?

Light energy

Carbon dioxide

Water

Oxygen (correct)

What is the equation for photosynthesis?

Light energy + CO₂ + H₂O → C₆H₁₂O₆ (glucose) + O₂ (oxygen) (correct)

Light energy + CO₂ + O₂ → C₆H₁₂O₆ (glucose) + H₂O

Light energy + CO₂ → C₆H₁₂O₆ (glucose) + O₂ (oxygen)

Light energy + H₂O + O₂ → C₆H₁₂O₆ (glucose) + CO₂

What happens to excess glucose produced during photosynthesis?

It is stored in the roots, stems, and seeds as starch Signup and view all the answers

Why do plants stop making food at night when it is dark?

Because photosynthesis requires light energy to produce food Signup and view all the answers

What is the primary reason for the presence of starch in the part of the leaf exposed to light?

The leaf is converting glucose into starch Signup and view all the answers

What is the most likely reason why the rate of photosynthesis would decrease in an experiment using a water plant and a lamp?

The carbon dioxide in the water has been depleted Signup and view all the answers

Which of the following is not a requirement for photosynthesis?

Oxygen Signup and view all the answers

What is the role of stomata in the process of photosynthesis?

To facilitate gas exchange Signup and view all the answers

What is the equation for photosynthesis?

6CO2 + 6H2O → C6H12O6 + 6O2 Signup and view all the answers

Plants release carbon dioxide as a byproduct of photosynthesis.

False Signup and view all the answers

Chlorophyll is the green substance in plants that traps light energy.

True Signup and view all the answers

Stomata are primarily responsible for the transport of water within the plant.

False (Stomata are for gas exchange, roots and xylem transport water) Signup and view all the answers

Animals and plants both obtain their energy directly from the food they eat.

False (Plants make their own food through photosynthesis) Signup and view all the answers

Photosynthesis only occurs during the day when there is light.

True Signup and view all the answers

What are the tiny openings on leaves called?

Stomata Signup and view all the answers

What is the equation for photosynthesis?

Light energy + CO₂ + H₂O → sugar + O₂ (oxygen) Signup and view all the answers

Where is excess glucose stored in plants?

Excess glucose is converted to starch and stored in different parts of the plant, such as roots, stems, and seeds. Signup and view all the answers

Explain the role of stomata in photosynthesis.

Stomata are tiny openings on the leaves that allow carbon dioxide to enter and oxygen to exit, facilitating gas exchange necessary for photosynthesis. Signup and view all the answers

How is water transported to the leaves of the plant?

Water is absorbed by the roots and transported to the leaves through the xylem vessels. Signup and view all the answers

Study Notes

Photosynthesis

Key Concepts

Photosynthesis is the process by which plants make food using light, water, and carbon dioxide, producing sugar (glucose) and oxygen.
Chlorophyll is a green substance in plants that traps light energy.
Stomata are tiny openings on leaves for gas exchange (carbon dioxide in, oxygen out).

Process Overview

Light energy is absorbed by chlorophyll in the leaves.
Carbon dioxide enters through stomata, while water is absorbed by roots and transported to the leaves.
Light energy is used to convert CO₂ and H₂O into glucose and O₂.
Excess glucose is converted to starch and stored in roots, stems, and seeds (e.g., potatoes, rice, corn).

Requirements

Light energy is required for photosynthesis.
Carbon dioxide is obtained from the air through stomata.
Water is absorbed by roots and transported to the leaves.

Equation for Photosynthesis

Light energy + CO₂ + H₂O → C₆H₁₂O₆ (glucose) + O₂ (oxygen)

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Description

Review key concepts of photosynthesis, including the process, chlorophyll, and stomata. Prepare for your exam with these concise revision notes and practice questions.