Sexual Reproduction In Plants

Question 1

Describe what happens to pollen in diagram 1 and 2

Answer 1

. Pollen is deposited on insect
. Pollen is transferred to stigma

Question 2

Explain how there is effective transfer between the 2 flowers of the same species (1)

Answer 2

Anther and stigma touch same part of bee

Question 3

How can self pollination be avoided (1)

Answer 3

Anther and stigma mature at different times

Question 4

Function of generative male nucleus (1)

Answer 4

. Fertilisation
. It is the gamete

Question 5

Function of the tube nucleus (1)

Answer 5

. Control the growth of the pollen tube

Question 6

Explain why the grains more correctly described as a fruit rather than a seed (2)

Answer 6

. Fruits retain ovary wall
. Seed would only have a testa

Question 7

What the main disadvantage of self pollination (1)

Answer 7

. Lack of / less genetic variation

Question 8

State how the production of pollen grain has enabled flowering plants to adapt to terrestrial life (3)

Answer 8

. Pollen tube delivers male gametes to egg / pollen grain transferred by wind
. Stop risk of dehydration of gametes
. Tough exine

Question 9

Where is embryo plants from

Answer 9

Zygote