3.1

Question 1

What is food security

Answer 1

Everyone must have a sufficient quantity, sufficient quality, sufficient access to food

Question 2

How can science contribute to food security?

Answer 2

Selective breeding
Genetic modification
Biodegradable pesticides

Question 3

What are the Factors affecting plant growth

Answer 3

Fertiliser levels pests
Soil type. Disease
Drainage. Competition
Tempature
Rainfall
Light avilibilty

Question 4

How much of light energy in leaves is absorbed and in what section?

Answer 4

83% is absorbed
12% is reflected
5% is transmitted

Question 5

What is a pigment.

Answer 5

Substance that absorbs or reflects light

Question 6

What do chlorophyll A and B absorb?

Answer 6

Blue and red light

Question 7

What is the purpose of accessory pigments

Answer 7

They absorb energy from other regions of the spectrum and pass it onto chlorophyll, which allows the plant to use a wide range of wavelengths for photosynthesis

Question 8

What is the absorption spectrum

Answer 8

Each wavelength of light

Question 9

What is the action spectrum

Answer 9

Different wavelengths of light being used for photosynthesis

Question 10

Where does the Calvin cycle take place?

Answer 10

Stoma of the chloroplast

Question 11

Where does the electron transport chain take place

Answer 11

Grana of the chloroplast

Question 12

What can the glucose produced by the Calvin cycle be used for?

Answer 12

Synthesised into starch and cellulose
Passed onto biosynthetic pathways

Question 13

What is the purpose of RUBP in the Calvin cycle

Answer 13

Allows the cycle to continue and makes G3P