Unit 2 : Multi-cellular Organisms - Sexual Reproduction

Question 1

What do all living things produce ?

Answer 1

Offspring similar to themselves.

Question 2

In humans, what are the 2 gametes ?

Answer 2

Sperm and egg.

Question 3

How many chromosomes do human gametes contain ?

Answer 3

23 = haploid

Question 4

How many chromosomes do normal body cells contain ?

Answer 4

46 = diploid

Question 5

What are the features of an egg ? (5)

Answer 5

Large in size. 1 produced per month. Unable to move. Has a large food store. Produce in the ovaries.

Question 6

What are the feature of a sperm ? (5)

Answer 6

Microscopic. Half a billion produced. Can swim. Has no food store. Produced in the testes.

Question 7

Where does fertilisation take place in humans ?

Answer 7

In the oviduct.

Question 8

What does the fertilisation of the human male nucleus & female nucleus produce ?

Answer 8

zygote

Question 9

What is the function of the urethra ?

Answer 9

Carries sperm out of the body.

Question 10

What is the function of the sperm duct ?

Answer 10

Carries sperm from the testes.

Question 11

What is the function of the glands ?

Answer 11

Adds fluid to the sperm.

Question 12

What is the function of the scrotum ?

Answer 12

Protects the testes.

Question 13

What is the function of the oviduct ?

Answer 13

Carry egg to the uterus.

Question 14

What is the function of petals on a flower ?

Answer 14

Attracts insects and other pollinators.

Question 15

What is the function of the sepals ?

Answer 15

Protects the flower bud.

Question 16

What is the function of the nectary ?

Answer 16

Produces nectar.

Question 17

What is the male part of a flower called & what structures are within it ?

Answer 17

Stamen = Anther + filament.

Question 18

What is the function of the anther ?

Answer 18

Makes pollen grain.

Question 19

What is the function of the filament ?

Answer 19

Provides support for the anther.

Question 20

What is the female part of a flower called & what structures are within it?

Answer 20

Carpel = ovary + style + stigma

Question 21

What is the function of the stigma ?

Answer 21

Traps pollen grain

Question 22

What is the function of the style ?

Answer 22

Pollen tube travels through here.

Question 23

What is the function of the ovary ?

Answer 23

Produces ovules.

Question 24

What are the two process involved in sexual reproduction in plants ?

Answer 24

Pollination and fertilisation.

Question 25

What are the two types of pollination ?

Answer 25

Cross- pollination & self- pollination

Question 26

What is cross- pollination ?

Answer 26

The transfer of pollen from the anther of one flower to the stigma of another flower.

Question 27

What is self- pollination ?

Answer 27

This is when the pollen from the anther of a flower is transferred to the stigma of the same flower.

Question 28

How can pollination carried out ?

Answer 28

By insects or wind.

Question 29

Describe the stages of fertilisation ?

Answer 29

The pollen grain germinates on the stigma. The pollen grain grows a pollen tube down through the style towards the ovule. The male gamete (nucleus) travels down the pollen tube to the ovule. The male nucleus fuses with the female nucleus inside the ovule. This is fertilisation. The fertilised ovule becomes a seed and the whole ovary swells up to form a fruit.