B15 Sexual reproduction in plants

Question 1

Pollination

Answer 1

the transfer of pollen grains from the male part of the plant (anther of stamen) to the female part of the plant (stigma)

Question 2

Male gamete in plants

Answer 2

pollen

Question 3

Function of petals

Answer 3

Brightly colored to attract insects

Question 4

Function of stamen

Answer 4

The anther and filament of the plant. Long so that it is close to the stigma, and easily accessible to the insect. There are many anthers to increase the chances of insects carrying across pollen grains.

Question 5

Function of carpel

Answer 5

The stigma, style and ovary of the plant. It is long and close to the stamen; there is only one carpel in each flower

Question 6

Function of sepal

Answer 6

To protect the flower when it’s breeding

Question 7

Function of nectary

Answer 7

To attract insects

Question 8

The stages leading up to fertilization in plants

Answer 8

1) The forms a pollen tube
2) The pollen tube grows down the style by digesting the tissues of the style with enzymes
3) As the pollen tube grows it carries the pollen tube nucleus with it
4) When it reaches the ovary it enters the ovule through the micropyle

Question 9

Why are there 2 nuclei in a plant

Answer 9

1 is for stored food, 1 is for fusing with egg nucleus

Question 10

Micropyle

Answer 10

A small hole that allows pollen tube to enter down into the pollen tube nucleus