O Level Science Weekly Quiz

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

None of the above

Holes that are used to transport water up the tree

Little pores on the underside of leaves

Little holes found on its stem

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

It absorbs oxygen

It acts as a control

It absorbs carbon dioxide

It acts as a base

3. Which one is the byproduct of photosythensis

Oxygen

Stomata

Water

Carbon dioxide

4. 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

Boiling the leaf in water in order to soften it

Adding iodine drops in water towards the end of the experiment

Boiling the leaf in iodine

5. Where do cerials store the starch?

In tubers

Within their seeds

In their tussels

In their flowers

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

In order to kill the leaf

Because the leaf becomes brittle and needs to be softened

In order to soften the leaf

To remove cholorophyll

7. Select the features that make leaves suited for Photosythnesis

They are not thin

They can respire

They contain chlorophyll

They are green in colour

They have stomata

They are broad

They have thick cuticles

They have a transparent epidermis

8. 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

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

Pure alcohol

Methylated Spirit

Iodine crystals

Benedict’s solution

10. 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

11. What is the original colour of iodine solution?

Green

Blue black

Redish brown

Colourless

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