O Level Science Weekly Quiz

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

In order to soften the leaf

To remove cholorophyll

In order to kill the leaf

Because the leaf becomes brittle and needs to be softened

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

Pure alcohol

Iodine crystals

Benedict’s solution

Methylated Spirit

3. Select the features that make leaves suited for Photosythnesis

They have a transparent epidermis

They have thick cuticles

They are green in colour

They are broad

They contain chlorophyll

They can respire

They are not thin

They have stomata

4. Which one is the byproduct of photosythensis

Stomata

Oxygen

Water

Carbon dioxide

5. 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

6. What is the original colour of iodine solution?

Redish brown

Colourless

Green

Blue black

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

Photosythensis

Transipiration

Dislocation

Translocation

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

Little pores on the underside of leaves

Little holes found on its stem

Holes that are used to transport water up the tree

None of the above

9. Where do cerials store the starch?

In their flowers

Within their seeds

In their tussels

In tubers

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

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

Boiling the leaf in water in order to soften it

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

It acts as a control

It absorbs oxygen

It acts as a base

It absorbs carbon dioxide

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