A. As a senior biology student, you have been asked to demonstrate to the students of secondary level in your school, the procedure(s) that shall ensure cross-pollination in a hermaphrodite flower. List the different steps that you would suggest and provide reasons for each one of them.
B. Draw a diagram of a section of a megasporangium of an angiosperm and label funiculus, micropyle, embryosac, and nucellus.
Answers
Answer:
pollination:
types:
self pollination and cross pollination
Steps to ensure artificial pollination in a hermaphrodite flower include Emasculation, Bagging, Pollination and Bagging again.
Diagram with all the markings are attached below.
Explanation:
- Artificial pollination is essential for the hybridization of the plants.
- Artificial pollination include the four fundamental steps - Emasculation, Bagging, Pollination and Bagging again.
- In the Emasculation step, the flower in the bud stage is cut open to cut off the Androecium off the flower.
Then these flowers are covered with plastic or paper bags to avoid any unnecessary pollination called bagging.
Then the pollen from the desired plant is collected.
This pollen is then sprinkled over the bagged flowers after opening the bags.
Then these flowers are again bagged and wait until fruit developes.
Megasporanguim contains the structures like funiculus, nucellus, micropyle and embryo sac.
The funiculus holds the megasporanguim with placenta.
The nucellus is the packing parenchymatous cells of megasporanguim in which embryo sac is placed.
The embryo sac contains the main ovule.
The micropyle is the pore through which the pollen tube enters the embryo sac.
For more information about artificial pollination,
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