A) rosette tier
B) suspensor tier
C) embryonal tier
D) free-nuclear tier
Correct Answer: A
Solution :
The zygote of Pinus immediately germinates. It undergoes a series of mitotic divisions, still enclosed within the ovule, to form a relatively elaborated 16 celled proembryo. The four lowermost cells farthest from the micropylar end constitute the embryonal tier each of these may develop into an embryo. The cells next above the embryonal tier constitute suspensor tier the third tier from below is called the rosette tier. The fourth uppermost tier is formed by four free nuclei known as free nuclei tier, which takes no part in the development of embryo.
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