FERTILISATION AND GERMINATION IN PLANTS

Question 1

FERTILISATION IS THE (…)

Answer 1

FUSION OF GAMETES

Question 2

HOW DOES FERTILISATION WORK IN PLANTS

Answer 2

1) A POLLEN GRAIN LANDS ON THE STIGMA
2) A POLLEN TUBE GROWS OUT OF THE POLLEN GRAIN. AND DOWN THROUGH THE STYLE TO THE OVARY AND INTO THE OVULE
3) A NUCLEUS FROM THE MALE GAMETE MOVES DOWN THE TUBE TO JOIN WITH THE FEMALE GAMETE IN THE OVULE
4) THE TWO NUCLEI FUSE (FERTILISE) TOGETHER TO MAKE A ZYGOTE
5) ZYGOTE DIVIDES BY MITOSIS TO FORM AN EMBRYO
6) EACH FERTILISED FEMALE GAMETE FORMS A SEED AND THE OVARY DEVELOPS INTO A FRUIT AROUND THE SEED

Question 3

GERMINATION IS WHEN (…)

Answer 3

SEED START TO GROW

Question 4

HOW DOES GERMINATION IN PLANTS WORK

Answer 4

SEEDS NEED THE RIGHT CONDITIONS TO START GERMINATING, THOSE ARE:

1) WATER- TO ACTIVATE THE ENZYME THAT BREAK DOWN THE FOOD RESERVES IN THE SEED
2) OXYGEN- FOR RESPIRATION, WHICH TRANSFERS ENERGY FROM FOOD FOR GROWTH
3) A SUITABLE TEMPERATURE- FOR ENZYMES INSIDE THE SEED TO WORK

Question 5

GRMINATING SEEDS GET ENERGY FROM FOOD STORES…

Answer 5

BECAUSE A DEVELOPED SEED CONTAINS AN EMBRYO AND A STORE OF FOOD RESERVE WRAPPED IN A HARD SEED COAT

WHEN A SEED STARTS TO GERMINATE IT GETS GLUCOSE FOPR RESPIRATION, FROM ITS OWN FOOD STORE

THIS TRANSFES THE ENERGY IT NEEDS TO GROW