IGCSE Biology plant nutrition and Gas exchange in plants

Question 1

What effect does increasing light have on photosynthesis?

Accepted Answer

Increases it to a maximum

Question 2

In the hydrogen carbonate experiment, which is not an example of a control variable?

Accepted Answer

Amount of light

Question 3

What is the purpose of the boiling water in the testing leaves for starch practical?

Accepted Answer

Stop chemical reactions

Question 4

What is the purpose of the cold water in the testing leaves for starch practical?

Accepted Answer

Soften the leaf

Question 5

In bright light hydrogen carbonate indictor with a leaf Present goes...

Accepted Answer

Purple

Question 6

The stomata are found in....

Accepted Answer

The Lower epidermis

Question 7

Which is a reactant in photosynthesis?

Accepted Answer

Carbon dioxide

Question 8

Which of these is glucose not used for in the plant?

Accepted Answer

Lactose

Question 9

The cells containing chloroplast are found in....

Accepted Answer

Palisade layer

Question 10

In the dark hydrogen carbonate indictor with a leaf Present goes...

Accepted Answer

Yellow

Question 11

The function of the cuticle is to....act as a barrier to microorganisms and...

Accepted Answer

Prevent water loss by evaporation

Question 12

Which is a reactant in photosynthesis?

Accepted Answer

Water

Question 13

What is the purpose of the ethanol in the testing leaves for starch practical?

Accepted Answer

Decolourise the leaf

Question 14

Nitrates in plants are used for?

Accepted Answer

Making amino acids, proteins, chlorophyll and DNA

Question 15

Water and mineral ions are supplied to the leaf by..

Accepted Answer

The xylem

Question 16

Elodea are an aquatic plant that are used to show that...

Accepted Answer

Oxygen is produced

Question 17

The function of the guard cells is to...

Accepted Answer

Open or close the stomata

Question 18

What is the reagent we use to test for starch?

Accepted Answer

Iodine

Question 19

In the bell jar demonstration, what is the purpose of the soda lime?

Accepted Answer

Absorb carbon dioxide

Question 20

What number do we add to balance the photosynthesis equation and how many times?

Accepted Answer

6,3

Questions 20