Raw Materials
Name one raw material needed for photosynthesis
Water.
What gives leaves their green colour?
Chlorophyll.
What is photosynthesis?
The process by which green plants make food using sunlight, CO₂ and water.
What is the source of energy for photosynthesis?
Sunlight.
Would a plant kept in complete darkness photosynthesise normally?
No.
From where do plants get carbon dioxide?
From the air.
Where is chlorophyll mainly found?
In chloroplasts of plant cells.
What is the food made during photosynthesis?
Glucose.
What are the three main requirements for photosynthesis?
Sunlight, chlorophyll, carbon dioxide and water.
What happens if a leaf has no chlorophyll?
It cannot photosynthesise normally.
How does water reach the leaves?
Through the xylem.
Why is chlorophyll important?
It absorbs light energy for photosynthesis.
What gas is taken in during photosynthesis?
Carbon dioxide.
What happens to water during photosynthesis?
It provides hydrogen and oxygen; oxygen is released.
Why are leaves called the food factories of plants?
They contain chlorophyll and carry out photosynthesis.
Through which structures does CO₂ enter the leaf?
Stomata.
Which colours of light are absorbed most effectively by chlorophyll?
Mainly red and blue light.
What gas is released during photosynthesis?
Oxygen
What happens to glucose produced by the plant?
It may be used for energy or converted into starch and stored.
If stomata are closed for a long time, what happens to photosynthesis?
CO₂ entry decreases, so photosynthesis decreases.
Why are stomata important for photosynthesis?
They allow CO₂ to enter and oxygen to exit.
Why do we see most leaves as green?
Chlorophyll reflects green light more than it absorbs it.
Why is photosynthesis important for living organisms?
It produces food and releases oxygen.
Write the word equation for photosynthesis.
Carbon dioxide + Water → Glucose + Oxygen, in the presence of sunlight and chlorophyll.
A plant receives sunlight and water but very little CO₂. What will happen?
Photosynthesis will be limited because CO₂ is a necessary raw material.