seeds and germination

Question 1

what are the two types of seed

Answer 1

1) monocotyledon

2) dicotyledon

Question 2

what are the conditions needed for germination

Answer 2

1) water
2) oxygen
3) temperature

Question 3

why is water important for seed germination

Answer 3

nutrients in dry tissue need to be rehydrated and the water cracks the seed coat allowing roots to grow

Question 4

why is oxygen important in seed germination

Answer 4

for aerobic respiration as large amounts of ATP are needed for growth

Question 5

why is temperature important for seed germination

Answer 5

provides optimum temp for enzyme activity

Question 6

what is Gibberellin

Answer 6

a plant growth hormone

Question 7

outline the role of gibberellin in germination

Answer 7

1) water is imbibed through a micropyle causing the cotyledon to swell and the Testa to split increasing oxygen for aerobic respiration
2) the water activates the gene for gibberellin synthesis
3) gibberellin diffuses to the aleurone layer which contains proteins and induces the synthesis of amylase
4) amylase breakdowns starch into maltose in the endosperm
5) the maltose is used by the embryo in aerobic respiration when converted into glucose which is used for the growth of the radicle and plumule