Biology · May / June 2020 · Paper 41 · Question 4

Sorghum ;

feathery stigma / stigma with large surface area ;

stigma / anthers, hang outside the flower(s) ;

C ovary (wall) ;

D ovule ;

E style ;

meiosis / reduction division ;

haploid ;

fuses / joins / combines ;

diploid ;

fertilisation ;

zygote ;

mitosis ;

any five from:

(gives) genetic variation / diversity ;

ref to, alleles / genes / DNA, from different, plants / parents ;

allows mutations to be, expressed / AW ;

allows adaptation to, new conditions / changed environment / AW ;

(new species) can evolve / allows natural selection to occur ;

pollen exchanged between individuals / cross pollination ;

seeds are dispersed ;

can colonise new areas / AW ;

less competition (with parent plant / among offspring) ;

seeds may be dormant ;

survival through, harsh / adverse, conditions ;

AVP ;

any three from:

protein synthesis ;

transport in the phloem ;

cell division / mitosis / meiosis ;

active transport / absorption of ions (from the soil) ;

growth ;

movement / muscular contraction ;

sensitivity ;

nerve impulses ;

AVP ;;;