Food supply

Question 1

What is food security?

Answer 1

Having access to food of sufficient quality in sufficient quantity.

Question 2

What is meant by sustainable food production?

Answer 2

Growing food without degrading natural resources on which agriculture depends.

Question 3

How can we improve crop production with limited area for crop growing?

Answer 3

• Growing higher yielding cultivars
• Protecting crops from weeds and pests
• Using fertilisers

Question 4

Why is farming livestock less efficient than farming crops?

Answer 4

90% of energy is lost at each trophic level

Question 5

What is an action spectrum?

Answer 5

Shows the rate of photosynthesis at different wavelengths of light.

Question 6

What is an absorption spectrum?

Answer 6

Shows which wavelengths of light have been absorbed by a plant.

Question 7

Which wavelengths of light are absorbed by chlorophyll?

Answer 7

Blue and Red

Question 8

Which wavelengths of light are absorbed by the carotenoids?

Answer 8

Green

Question 9

What is the advantage of having the carotenoid pigments?

Answer 9

It extends the range of wavelengths of light that can be absorbed by plants.

Question 10

What are the three fates of light when it strikes a leaf?

Answer 10

Absorbed, Reflected, Transmitted

TAR