Photosynthesis & Leaf Structure (CIE IGCSE Biology: Co-ordinated Sciences (Double Award))

Extended Tier Only

Which row of the table below shows the correct effects of deficiencies of essential minerals for plant growth?

	effect of magnesium ion deficiency	effect of nitrate ion deficiency
A	yellow leaves	stunted growth
B	stunted growth	long roots
C	small leaves	yellow leaves
D	stunted growth	yellow leaves

Extended Tier Only

Which of the following best describes the role of chlorophyll in photosynthesis?

Extended Tier Only

The average number of chloroplasts found in four different types of cell from the leaf of a plant are shown in the bar chart below.

What are the names of the four types of cell?

	1	2	3	4
A	spongy mesophyll cell	epidermal cell	palisade mesophyll cell	guard cell
B	palisade mesophyll cell	guard cell	spongy mesophyll cell	epidermal cell
C	epidermal cell	spongy mesophyll cell	palisade mesophyll cell	guard cell
D	palisade mesophyll cell	spongy mesophyll cell	guard cell	epidermal cell

A student sets up an experiment to measure the rate of oxygen production of an aquatic plant when it is photosynthesising.

The student repeated the experiment several times to calculate the average amount of oxygen collected.

Which two factors should be kept constant during the student’s experiment?

Extended Tier Only

Which of the following correctly identifies some of the molecules produced from the glucose synthesised by photosynthesis?

	1	2	3
A	cellulose for storage	fats and oils for  energy storage	starch to build cell walls
B	cellulose to build cell walls	fats and oils for energy storage	starch for storage
C	sucrose to be transported around the plant	fats and oils for energy storage	cellulose for storage
D	sucrose to be transported around the plant	starch to build cell walls	cellulose for storage

Extended Tier Only

Two test tubes are set up with two similar leaves inside them, as shown in the diagram below.

One test tube is exposed to light, while the other is kept in the dark.

 

The test tubes are left for 4 hours.

What colour will the hydrogencarbonate indicator solution be in each test tube?

	dark	light
A	purple	yellow
B	colourless	yellow
C	purple	colourless
D	yellow	purple

A student sets up a photosynthesis experiment.

A plant with striped leaves (similar to the one shown below) was kept in bright light for four hours. 

A leaf was removed from the plant and treated with ethanol in hot water to remove chlorophyll before iodine was used to test for starch.

Which diagram shows the result of the test?

Extended Tier Only 

The following could be used to write a balanced symbol equation for photosynthesis.

1. 6CO₂ + 6H₂O
2. CO₂ + 6H₂O
3. Light and chlorophyll
4. C₆H₁₂O₆ + 6O₂
5. 6C₆H₁₂O₆ + 6O₂

Which of the following represents the correct balanced chemical equation for photosynthesis?

The diagram below shows a cross-section through a leaf as seen under a microscope.

In which part of the leaf would the concentration of carbon dioxide be lowest on a warm, sunny day?