O Level Science Weekly Quiz

1. Select the features that make leaves suited for Photosythnesis

They have stomata

They have a transparent epidermis

They contain chlorophyll

They are not thin

They have thick cuticles

They are green in colour

They are broad

They can respire

2. Which of the following materials are used in the test for starch in leaves?

Iodine crystals

Benedict’s solution

Pure alcohol

Methylated Spirit

3. Why are leaves boiled in alchohol during the test for starch?

Because the leaf becomes brittle and needs to be softened

In order to kill the leaf

In order to soften the leaf

To remove cholorophyll

4. Where do cerials store the starch?

In tubers

In their tussels

In their flowers

Within their seeds

5. Which of the following is not a step in the test for starch in leaves

Boiling the leaf in water in order to soften it

Boiling the leaf in iodine

Observing colour changes after iodine is put on the leaf

Adding iodine drops in water towards the end of the experiment

6. The process by which sugars are transported from the leaves through microscopic tubes to the other parts of the plant is known as

Transipiration

Translocation

Photosythensis

Dislocation

7. What is the original colour of iodine solution?

Redish brown

Green

Colourless

Blue black

8. Which one the following statements is not true?

Plants require oxygen in order to live

Plants require magnesium in order to live

Plants require water in order to live

Plants require oxygen in order to live

9. What the purpose of soda lime during the photosynthesis experiments?

It absorbs carbon dioxide

It acts as a control

It absorbs oxygen

It acts as a base

10. What part of the plant are known as stoma?

Little pores on the underside of leaves

None of the above

Holes that are used to transport water up the tree

Little holes found on its stem

11. Which one is the byproduct of photosythensis

Oxygen

Water

Carbon dioxide

Stomata

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