Question

Entry of pollen tube through chalaza end is
a. Syngamy
b. Porogamy
c. Misogamy
d. Basigamy

Answer 1

Hint: Diploid zygote is the result of male and female fusion of the syngamy. Micro Pyle helps to enter the pollen tube in the ovule by using the process porogamy. And in the nucleus or integuments entry of the pollen tube in the ovule by using the technique misogamy. Entry of the pollen tube in the ovule by the process chalaza known as chalazogamy and basigamy.

Complete answer:
Pollen development and maturation due to the end of meiosis in the microscope in which mother cells mark a turning point in microsporogenesis. Given the result of 4 microspores each with its own callose envelope. QUARTET is the gene that’s responsible for the gene separation of the macrospores from the tetrad in the Arabidopsis. But sometimes mutations occurred in the macrospores in the tetrads.

There are two types of cells present in the mitotic division in the pollen grains:
- Vegetative cells that developed into the pollen tube and obtained most cytoplasmic organelles.
- Generative cell that produced small sperm, cytoplasm partitioned in the mitotic division, and lacks mitochondria and chloroplasts present in it.

Hence, the correct answer is option (D).

Note: Embryo sac helps to enter the pollen into the ovule from the micropylar end. With the help of filiform apparatus pollen tube passes either between the egg cells and the synergrid part that is present in it. Misogamy is the process in which pollen tubes enter in the ovule through the integuments and commonly seen in the plants such as Populous and Cucurbita.