Biology · May / June 2022 · Paper 41 · Question 6

P – testis ;

S – zygote ;

Q – meiosis ;

R – fertilisation ;

T – mitosis ;

U – implantation ;

idea of maintenance of the same number of chromosomes (from generation to generation) / so (diploid) number of chromosomes does not double at fertilisation (described) ;

to prevent more than one sperm fertilising the egg / stops other sperm entering ;

1

diffusion / exchange ;

2

amino / fatty ;

3&4 ;; max. two from:

glucose

(named) vitamins

(named) minerals / ions / salts

glycerol

fatty acids

amino acids

5

passive ;

6

antigens ;

7

pathogen / (micro)organism ;