B1 2012

Question 1

Describe algae’s part in the carbon cycle?

Answer 1

Photosynthesise (absorb CO2), eaten by animals which respire and release CO2. Then decayed by microorganisms.

Question 2

Why is respiration faster in the tropical rainforest?

Answer 2

Warmer, moist conditions, a lot of material to decay, a lot of microorganisms.

Question 3

Why do shoots bend towards the light?

Answer 3

Auxin, more on dark side, causes growth on dark side.

Question 4

What releases antibodies?

Answer 4

White blood cells.

Question 5

How did scientists produce the genetically modified fish?

Answer 5

Genes cut out, using enzymes and are transferred to fish at early stage of development.

Question 6

How did beak sizes change?

Answer 6

1. Mutation of beak sizes.
2. Birds with larger beaks better adapted for feeding.
3. Birds with larger beaks survived.
4. Birds with larger beaks breed and allele for large beak passed onto their offspring.