1. Which characteristic of living organisms is correctly matched to the description?

• A

• B

• C

• D

2. The diagram shows a cell starting to plasmolyse.

In which direction is osmosis occurring?

• X to Y

• Y to X

• Y to Z

• Z to Y

3. Which chemical element is found in proteins, but not in carbohydrates or fats?

• carbon

• hydrogen

• oxygen

• nitrogen

4. Which statement about enzyme action is correct?

• The active site of the enzyme is complementary to the product and a substrate is formed.

• The active site of the substrate is complementary to the enzyme and a product is formed.

• The active site of the product is complementary to the enzyme and a substrate is formed.

• The active site of the enzyme is complementary to the substrate and a product is formed.

5. Which two arrows represent photosynthesis?

• 1 and 3

• 1 and 4

• 2 and 3

• 2 and 4

6. What is deficient in the diet when growing bones become soft and deformed?

• iron

• protein

• vitamin C

• vitamin D

7. The diagram shows a section through the heart.

When ventricles contract, which valves open and which valves close?

• open-1 and 3, close-2 and 4

• open-1 and 4, close-2 and 3

• open-2 and 3, close-1 and 4

• open-2 and 4, close-1 and 3

8. Hydrogencarbonate indicator changes colour with different concentrations of carbon dioxide.

A pond contains both plants and animals. Samples of pond water are taken during a sunny day and again during the night. Each sample is tested with hydrogencarbonate indicator.

What would be the results of these tests?

• day sample-purple, night sample-yellow

• day sample-red, night sample-purple

• day sample-red, night sample-red

• day sample-yellow, night sample-purple

9. What occurs when our eyes look from a near object in dim light to a distant object in bright light?

• Pupils constrict and lenses become thinner.

• Pupils constrict and lenses become fatter.

• Pupils dilate and lenses become thinner.

• Pupils dilate and lenses become fatter.

10. The diagram shows a section through an insect-pollinated flower.

When pollination occurs, where must the pollen grains reach?

• A

• B

• C

• D