sexual reproduction in flowers

Question 1

name the parts that make up the male part of the flower ( stamen )

Answer 1

anther and filament

Question 2

name the parts that make up the female part of the flower ( carpel )

Answer 2

stigma, style and ovary

Question 3

describe the features of a wind pollinated flower

Answer 3

• feathery stigma ( to catch the pollen)
• anther and stigma are located outside the flower ( wind is able to take pollen away)
• petals are small and less colourful ( no need to attract insects )
• pollen is small, light and smooth ( easily carried by wind )
• no scent or nectaries

Question 4

describe features of an insect pollinated flower

Answer 4

• sticky stigma
• anther and stigma located inside the flower ( insect is able to deposit pollen )
• petals are large and bright ( to attract insects )
• pollen grains are heavy and sticky ( easily picked up by insects )
  nectaries produce nectar ( to attract insects )

Question 5

describe the events that occur in fertilisation

Answer 5

• pollen sticks to stigma
• a pollen tube is created in the style by digestive enzymes
• pollen nucleus travels town pollen tube, towards the ovary
• the nucleus travels through the micropyle into the ovule and meets the ovum ( egg )
• the pollen and ovum form a zygote ( seed )

Question 6

describe ( and draw ) a diagram of a seed

Answer 6

• plumule ( embryo shoot )
• radicle ( embryo root )
• starch reserve
• ovule wall = seed coat ( testa )
• ovary wall = fruit coat

Question 7

what are the conditions needed for germination

Answer 7

water - to activate enzymes for reactions
warm temperature - optimum temperature for enzyme reactions
oxygen - aerobic respirations

Question 8

why is water needed for germination

Answer 8

activates enzymes which breaks down food reserves of starch into glucose which can be used to release energy via respiration