CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon


Question

Female gametophyte of a typical dicot at the time of fertilization is 


A
8 celled
loader
B
7 celled
loader
C
6 celled
loader
D
4 celled
loader

Solution

The correct option is B 7 celled
In dicots, at the time of fertilization the female gametophyte develops from a single megaspore. This megaspore undergoes three successive mitotic divisions to form eight nucleated embryo sac. Two nuclei are formed in the first mitotic division in the megaspore. The two nuclei move to opposite poles. These nuclei divide and re-divide at their ends to form eight nucleated stage. Each end has four nuclei. Three nuclei differentiate into two synergids and one egg cell at the micropylar end. At the chalazal end, three nuclei differentiate as antipodal cells. The remaining two cells, one of the micropylar end and other at the chalazal end migrate towards the center and fuse. Hence, female gametophyte of angiosperm is 7 celled and 8 nucleated structure. 
Thus, the correct answer is option B.

642867_55168_ans.png

Biology

Suggest Corrections
thumbs-up
 
0


similar_icon
Similar questions
View More


similar_icon
People also searched for
View More



footer-image