Expain what happens when : (a) Testosterone is released in males . (b) Pollen grain falls on the stigma of the flower . (c) Egg fuses with sperm cell . (d) Planaria is cut into many pieces . (e) Buds are formed in the notches of the Bryophyllum leaf .
Answers
b. pollen pistil interactions take place .And pollination take place
c. diploid zygote is formed
d. regeneration take place
e. buds can form new plant on exposure to water and soil
Explaination of what happens when : (a) Testosterone is released in males . (b) Pollen grain falls on the stigma of the flower . (c) Egg fuses with sperm cell . (d) Planaria is cut into many pieces . (e) Buds are formed in the notches of the Bryophyllum leaf .
Explanation:
1. Testosterone is released in males
The testosterone hormone helps in producing sperms .
It helps in development of secondary sexual characters in males like beard , mustache etc
2. Pollen grain falls on the stigma of the flower
When pollen grain falls on stigma , it absorbs certain nutrients , swells up and due to which its exine ruptures and intine protrudes to form pollen tube that grows day by day and enters embryo sac through micropyle .
3. Egg fuses with sperm cell
Egg fuses with sperm to form zygote that is diploid .This zygote transforms into embryo which further grows in to foetus .
4.Planaria is cut into many pieces
Planaria when cut in to pieces : then under favorable condition each part grows into a new planaria .
5.Buds are formed in the notches of the Bryophyllum leaf .
When the buds of bryophyllum falls on the ground , they take up all required nutrients , water , sunlight etc (all fav. conditions )an grows into new bryophyllum .