IGCSE co-ord science multi Nov 21

The list shows some requirements of living things:

1.light

2. 2. carbon dioxide

3. 3.water

4. 4. mineral ions.

5. What do plants need to make glucose?

• A) 1 and 2 only

• B) 2 and 3 only

• C) 3 and 4

• D) 1, 2, and 3

Which structure is only found in plant cells?

• A) cell membrane

• B) cytoplasm

• C) nucleus

• D) vacuole

Which molecule contains carbon?

• A) ammonia

• B) fat

• C) sulfuric acid

• D) water

An investigation was carried out to see the effect of pH on the activity of an enzyme found in the human alimentary canal. The graph shows the results obtained. What is the enzyme?

• A. a protease found in the mouth

• B. a protease found in the stomach

• C. an amylase found in the mouth

• D. an amylase found in the stomach

What will cause plant leaves to turn yellow?

• a lack of magnesium in the soil

• a lack of starch in the leaves

• a reduction in the rate of photosynthesis

• a reduction in the rate of respiration

Which nutrient is well provided by citrus fruits such as oranges and lemons?

• carbohydrate

• protein

• vitamin C

• vitamin D

Which row shows the state of the heart valves whilst the atria are contracting and the ventricles are relaxing?

• A

• B

• C

• D

Which diagram shows the rate and depth of breathing of a person before and during exercise?

• Diagram A

• Diagram B

• Diagram C

• Diagram D

A person touches a hot object with their hand. They quickly pull their hand away. Which statement is correct?

• The effector is their hand.

• The effector is the hot object.

• The receptor is in the muscles of their arm.

• The receptor is in the skin of their hand.

What is a characteristic of an insect-pollinated flower compared with a wind-pollinated flower?

• anthers inside flower / anthers outside flower

• petals small / petals large

• smooth pollen / sticky pollen

• stigma outside flower / stigma inside flower