Reproduction In Plants Flashcards
Asexual reproduction in plants
By taking cutting plants can reproduce asexually
Runners are asexually reproduced
Reproduction in plants
Asexual or sexually
After pollination a pollen tube grows from ovary to ovules (carries male nucleus) fertilisation is the fusing of the gametes
Sex organs of plants
Flowers
Male gamete
Pollen
Pollen formed where
In the anthers of the stamens
Female gametes
Ovules
Where are ovules formed
In the ovaries
How are gametes formed
By meiosis
Plants, insect -stamens
Inside petals
Insects must come in contact with them
Plant, insect- stigma
Sticky, so pollen grains attach
Plant, insect- petals
Large
Bright coloured to attract insects
Plants, insect- nectaries
Present to attract insects
Plant, insect- pollen grains
Large and sticky to stick to stick to insects
Plant, wind- stamens
Outside petals
So wind can blow pollen away
Plant, wind- stigma
Outside
To catch pollen blowing in the wind
Plant, wind- petals
Small and green
Plant, wind- nectaries
Absent
Plant, wind- pollen grains
Small
Smooth and light to carry in the wind
Plant fertilisation
The nucleus of the pollen must fuse with the nucleus of the ovule
(Pollen tube grows front he pollen grain into the ovary in the ovule)
Male nucleus travels down this
Zygote formed, turns into a seed
A seed contains
Embryo plant Root (radicle) Shoot (plumule) Seed leaves (cotyledons) Seed coat (testa)
Germination requires warmth
For maximum enzyme efficiency
Germination requires water
To soften the testa and for chemical reactions
Germinating requires oxygen
For respiration, to provide energy
