FORESTRY
PLANT AND WOOD ANATOMY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
The pollen tube nucleus and two male gametes
|
|
|
The generative nucleus and two male gametes
|
|
|
The pollen tube nucleus and the generative nucleus
|
|
|
The pollen tube nucleus and the microspore
|
Detailed explanation-1: -Upon germination, the tube cell forms the pollen tube through which the generative cell migrates to enter the ovary. During its transit inside the pollen tube, the generative cell divides to form two male gametes (sperm cells). Upon maturity, the microsporangia burst, releasing the pollen grains from the anther.
Detailed explanation-2: -The anther usually contains four pollen sacs which are responsible for producing pollen grains. Each pollen grain is a single cell containing two male gametes. Once mature, the anther splits open and pollen is released.
Detailed explanation-3: -0nce on the stigma, pollen may “germinate, ‘’ which means that a “pollen tube” forms on the sticky surface of the stigma and grows down into the ovule of the plant.