ST.3 Reproduction N5 (MO)

Question 1

What are body cells?

Answer 1

Body cells are diploid multicellular organisms and are haploid in gametes

Question 2

What does diploid mean?

Answer 2

Diploid means that each cell contains two sets of matching chromosomes

Question 3

What does haploid mean?

Answer 3

Haploid means that each cell contains one set of chromosomes

Question 4

What are gametes?

Answer 4

Gametes are sex cells and can be either male or female

Question 5

In plants, what organs produce gametes?

Answer 5

The organs that produce gametes in plants are anthers and ovaries. Anthers produce pollen grains containing the male gamete. Ovaries contain ovules which contain the female gamete

Question 6

In animals, what organs produce gametes?

Answer 6

The organs that produce gametes in animals are testes and ovaries. Testes produce the male gamete, sperm. Ovaries produce the female gamete, ova (egg)

Question 7

Describe female and male gametes

Answer 7

Sperm are very small and motile. Ova are large because they contain a food store and can not move by themselves

Question 8

What is fertilisation?

Answer 8

Fertilisation is the fusion of the nuclei of the two haploid gametes to produce a diploid zygote, which divides to form an embryo