Sexual Reproduction in Flowering Plants

Question 1

role of ANTHER?

Answer 1

Anter + filament = male part of plant called Stamen

Stamen produces and releases pollen

Question 2

What is the role of the stigma?

Answer 2

stigma + style and ovary = carpel - female part

Stimga receives pollen

Question 3

with what does each male gamete fuse in the embryo sac ?

Answer 3

one male gamete fuses wityh haploid egg cell to form diploid zygote.
2nd male gamete fuses with the two haploid polar nuclei to form a triploid nucleus

Question 4

as the seeds forms following fertilisation , a food store develops in one of two structures. Name one.

Answer 4

endosperm

Question 5

what is the product of each fusion ?

Answer 5

The diploid zygote and the triploid endosperm nucleus.

Question 6

Name site of production of pollen grain.

Answer 6

Anther

Question 7

Name the structure on which pollen lands to complete pollination.

Answer 7

Stigma

Question 8

Many species of plant have mechanisms that prevent self-pollination. Suggest how plants benefit from it.

Answer 8

Prevents inbreading

Question 9

Which part of a flower usually develops into a fruit.

Answer 9

Ovary

Question 10

Decribe events that follow the arrival of a pollen grain at the anther up to including fertilisation.

Answer 10

Pollen grain germinates
Grows through style
Generative nucleus divides by mitosis to form 2 male gametes.
Entry intro embryo sac
One fertilises the egg cell / on fertilises polar nuclei

Question 11

Give a role of sepals.

Answer 11

Protects flower when its a bud

Photosynthesis

Question 12

Describe the development of pollen grains from microspore mother cells.

Answer 12

Pollen mother cell divides by meiosis
4 haploid (n) pollen grains are produced
Each haploid pollen grain nucleus divides by mitosis to produce 2 nuclei 
-> tube and generative nucleus
Pollen grain matures

Question 13

What is meant by the term fertilization?

Answer 13

Fusion of gametes.

Formation of zygote

Question 14

What is meant by the dormacy of seeds?

Answer 14

Period of reduced metabolism

Period of no growth

Question 15

Give one way in which dormacy of seeds is of benefit to plants.

Answer 15

Survival
Germination delayed until conditions suitable for growth
Greater time for embryo development

Question 16

Suggest one way in which a knowledge of dormacy is useful to farmers and gardeners.

Answer 16

Optimum storage conditions
Maximise growing season
Seed treatment before sowing

Question 17

Why is water important in the process of germination?

Answer 17

For enzyme action
Transport of materials
Bursting testa

Question 18

Why is suitable temperature important for germination?

Answer 18

Enzyme activity

Question 19

Why is oxygen important in process of germination?

Answer 19

Needed for aerobic respiration

Question 20

Which part of embryo in germinating seed gives rise to following .
The ROOT
The SHOOT

Answer 20

Root - radicle

shoot - plumull

Question 21

What is meant by germination?

Answer 21

Growth of seed

Question 22

Why is digestion necessary in a germinating seed ?

Answer 22

To make food soluble or make food transportable

Question 23

From what structure in the carpel does the seed develop?

Answer 23

Ovule

Question 24

State two locations of the seed where food may be stored.

Answer 24

Cotyledon/ endosperm

Question 25

The embryo plant within the seed has a number of parts. List two and give role.

Answer 25

Radicle - develops root

Plumule - develops shoot

Question 26

Suggest two advantages of dormacy.

Answer 26

Survival/ increased dispersal

Question 27

Describe one method that is used to produce seedless fruits.

Answer 27

Spray them with axon

Question 28

Give brief account of the role of PETAL.

Answer 28

brightly coloured / attracts insects