Megasporophylls which are arranged spirally and acropetaly on the cent...
The correct answer is option 'C', which states that there are 2 megasporangia on the dorsal surface of the megasporophylls in the female cone of Pinus. Let's understand why this is the correct answer.
Megasporophylls are modified leaves that bear megasporangia, which are structures that produce megaspores. These megasporophylls are arranged spirally and acropetaly on the central axis of the female cone of Pinus. The arrangement of megasporangia on the megasporophylls determines the number and position of these structures.
Now, let's break down the given options and analyze each one:
a) 4 megasporangia on the dorsal surface: This option states that there are four megasporangia on the dorsal surface of the megasporophylls. However, this is incorrect. The correct number of megasporangia on the dorsal surface is 2, not 4.
b) 2 megasporangia on the ventral surface: This option states that there are two megasporangia on the ventral surface of the megasporophylls. However, this is also incorrect. The megasporangia are located on the dorsal surface, not the ventral surface.
c) 2 megasporangia on the dorsal surface: This option states that there are two megasporangia on the dorsal surface of the megasporophylls. This is the correct answer. The megasporangia are indeed located on the dorsal surface of the megasporophylls in Pinus.
d) 4 megasporangia on the ventral surface: This option states that there are four megasporangia on the ventral surface of the megasporophylls. However, this is incorrect. The megasporangia are not present on the ventral surface.
In conclusion, the correct answer is option 'C', which states that there are 2 megasporangia on the dorsal surface of the megasporophylls in the female cone of Pinus.
Megasporophylls which are arranged spirally and acropetaly on the cent...
Pinus is a monoecious plant that carry both male and female cone on the same plant but on different branches. The male cone (staminate / microsporangiate strobilus) bears spirally arranged microsporophyll on the central axis. Each microsporophyll carries two (2) megasporangia on dorsal surface...
So, correct answer is option (C)...
$$Hope it's help... $$
To make sure you are not studying endlessly, EduRev has designed NEET study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in NEET.