Reproduction in Plants

Question 1

Position of stamens in insect-pollinated flowers

Answer 1

Enclosed within flower so that insects must make contact

Question 2

Position of stamen in wind-pollinated flowers

Answer 2

Exposed so wind can easily blow pollen away

Question 3

Position of stigma in insect-pollinated flowers

Answer 3

Enclosed within the flower so that insects must make contact

Question 4

Position of stigma in wind-pollinated flowers

Answer 4

Exposed to catch pollen blowing in the wind

Question 5

Type of stigma in insect-pollinated flowers

Answer 5

Sticky so pollen grains attach from insects

Question 6

Type of stigma in wind-pollinated flowers

Answer 6

Feathery to catch pollen grains blowing in the wind

Question 7

Size of petals in insect-pollinated flowers

Answer 7

Large to attract insects

Question 8

Size of petals in wind-pollinated flowers

Answer 8

Small

Question 9

Colour of petals in insect-pollinated flowers

Answer 9

Brightly coloured to attract insects

Question 10

Colour of petals in wind-pollinated flowers

Answer 10

Not brightly coloured, usually green

Question 11

Nectarines in insect-pollinated flowers

Answer 11

Present - They produce nectar, a sweet lipid containing sugars as a “reward” for insects

Question 12

Nectarines in wind-pollinated flowers

Answer 12

Absent

Question 13

Pollen grains in insect-pollinated flowers

Answer 13

Larger, sticky grains or grains with hooks to stick to insects’ bodies

Question 14

Pollen grains in wind-pollinated flowers

Answer 14

Smaller, smooth, inflated grains to carry in the wind

Question 15

The growth of the pollen tube and fertilisation results in seed and fruit formation with what changes?

Answer 15

• The zygote develops into an embryonic plant with a small root (radical) and shoot (plumule)
• Other contents of the ovule develop into a food store for the young plant when it germinates
• The ovule wall becomes the seed coat or testa
• The ovary wall become the fruit coat (this can take many forms depending upon the fruit)

Question 16

Describe an experiment to investigate the conditions required for germination

Answer 16

1. Place a small seed e.g. peas or mustard on wet cotton wool in a test tube at room temperature; 2. Vary a condition for each additional test tube; 3. Leave for a few days then observe results

Question 17

Where are the food reserves in a seed?

Answer 17

The cotyledon

Question 18

What does natural asexual plant reproduction involve?

Answer 18

Part of the plant growing then breaking away from the parent plant before developing into a new plant e.g. runners, bulbs and tubers

Question 19

What does artificial asexual plant reproduction involve?

Answer 19

Using cuttings, which are part of a healthy plant’s stem that is planted where it will grow roots and develop into a new plant