sexual reproduction in the plant

Question 1

development of gametes of the pollen grain

Answer 1

pollen mother cell in the anther meiosis
4 haploid cells
pollen grain

Question 2

development of the embryo sac

Answer 2

embryo sac mother cell in the ovule meiosis
4 haploid cells
mature embryo sac

Question 3

pollination

Answer 3

transfer of pollen from anther to stigma

Question 4

self pollination

Answer 4

pollen grains are transferred onto the stigma of the sae flower

Question 5

cross pollination

Answer 5

pollen grains are transferred onto the stigma of a flower on another plant of the same species carried out the insects and wind

Question 6

fertilisation

Answer 6

1.pollen grain germinates to form pollen tube
2.polle tube grows down the style ad enters ovule via microphyle
3.nucelus divides by mitosis to form two haploid male gamete nuclei
4.two male gamete nuclei move down the pollen tube into the ovule
5.one male gamete nucleus fuses with egg cell
6. one male gamete nucelus fuses with 2 polar nuclei

Question 7

seed formation

Answer 7

-After fertilisation the zygote forms a seed embryo
-The endosperm nucleus forms endosperm
-The ovule develops into a seed integuments form the testa

Question 8

Endospermic seeds

Answer 8

food is stored in the endosperm e.g wheat

Question 9

Non - endospermic seeds

Answer 9

food is stored in the cotyledons
e.g broad bean

Question 10

Fruit formation

Answer 10

Fruit - mature ovary containing seed
Functions of fruit - to protect seeds
Importance of seed dispersal - allows plant to colonise in new areas

Question 11

Seed dispersal

Answer 11

wind dispersal
animal dispersal

Question 12

Dormancy

Answer 12

will not occur even if conditions are suitable

Question 13

advantages of seed dormancy

Answer 13

to prevent germination at the wrong time of the year

Question 14

Germination

Answer 14

embryo seeds begins to grow again