POLLINATION & GERMINATION

Question 1

Name the male reproductive part of a flower

Answer 1

stamen

Question 2

name 2 parts of the stamen and their functions?

Answer 2

anther = produces pollen (male gametes)

filament = holds up anther

Question 3

Name the female reproductive part of a flower

Answer 3

carpel

Question 4

name 3 parts of the carpel and their functions?

Answer 4

1. stigma = sticky to catch pollen (male gametes)
2. style = holds up stigma
3. ovary = contains ovules (female gametes)

Question 5

describe the features of insect pollinated plants

Answer 5

1. brightly coloured petals
2. sweet smelling petals
3. sticky or spikey pollen
4. anthers/stigmas held firmly inside flowers
5. sticky stigma

Question 6

describe the features of wind pollinated plants

Answer 6

1. small petals
2. dull/brown coloured petals
3. lots of pollen (it’ll be blown about)
4. light pollen
5. stigma/anthers are loose and dangle outside flowers

Question 7

what happens during plant fertilisation?

Answer 7

1. pollen lands on a stigma (icarried by insect/wind)
2. pollen tube grows down the style to the ovary
3. nucleus of pollen travels the pollen tube to the ovary
4. nucleus of pollen joins with nucleus of ovule inside the ovary
5. seed is formed

Question 8

after fertilisation, what happens to the ovary?

Answer 8

ovary develops into a fruit

(ovules - female gametes - become seeds)

Question 9

describe the structure of a seed

Answer 9

• seed coat = tough & protective
• embryo = young root/shoot that develops into a plant
• food store = starch to feed young plant until it photosynthesises to make its own food/energy

Question 10

what happens during germination?

Answer 10

seed starts to grow

Question 11

name 3 things a seed needs to germinate

Answer 11

1. water = seed swells up and embryo grows
2. O₂ = used in respiration (creates energy for germination)
3. warmth = speeds up reactions = speeds up germination

Question 12

what is speed dispersal and how does it happen?

Answer 12

seeds are carried away from parent plant

1. wind = seeds are light with parachutes/wings to be blown elsewhere
2. animal = seeds inside fruits that animals eat and poo out elsewhere
3. animal = seeds are hooked and stick to fur and dropped elsewhere
4. water = seeds of plants near rivers/seas are washed up elswhere
5. explosive = seeds inside fruits that burst open when ripe, throwing them elsewhere