O Level Science Weekly Quiz

1. Where do cerials store the starch?

In tubers

Within their seeds

In their flowers

In their tussels

2. 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

Observing colour changes after iodine is put on the leaf

Adding iodine drops in water towards the end of the experiment

Boiling the leaf in iodine

3. Which one the following statements is not true?

Plants require oxygen in order to live

Plants require water in order to live

Plants require magnesium in order to live

4. What is the original colour of iodine solution?

Blue black

Green

Redish brown

Colourless

5. Select the features that make leaves suited for Photosythnesis

They are broad

They have stomata

They can respire

They have thick cuticles

They are green in colour

They are not thin

They have a transparent epidermis

They contain chlorophyll

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

Iodine crystals

Pure alcohol

Methylated Spirit

Benedict’s solution

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

In order to soften the leaf

In order to kill the leaf

Because the leaf becomes brittle and needs to be softened

To remove cholorophyll

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

None of the above

Little holes found on its stem

Little pores on the underside of leaves

Holes that are used to transport water up the tree

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

Dislocation

Translocation

Photosythensis

Transipiration

10. Which one is the byproduct of photosythensis

Water

Carbon dioxide

Stomata

Oxygen

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

It acts as a base

It absorbs oxygen

It absorbs carbon dioxide

It acts as a control

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