Answer :

(a)


• Fertilization is a distinctive feature of the angiosperm life cycle. Out of 2 sperm, one fertilizes the egg to form the zygote.


• The other sperm combines with the secondary nucleus to form a triploid (3n) nucleus called the primary endosperm nucleus (PEN) in the large central cell of the embryo sac.


• The union of two male gametes with different nuclei of the embryo sac is termed double fertilization.


• The fertilized egg becomes the zygote and develops into an embryo. The primary endosperm nucleus after division gives endosperm.


• The endosperm is rich in nutrients, which it provides to the developing embryo.


• In case of coconut, endosperm is the most important economic part that provides a refreshing health drink during the immature stage and edible oil during the mature stage.


(b)


• Pollen banks are used to store pollen grains for a short as well as very long period of time at different conditions.


• Pollen grains are stored through cryopreservation techniques.


• The most important application of pollen bank is that it preserves the biodiversity in the form of valuable genetic resources. The preserved pollen grains can then be used for crop breeding programmes.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

In the given diagBiology - Exemplar

Vivipary automatiBiology - Exemplar

(a) Trace tBiology - Board Papers

List the changes Biology - Exemplar