Proembryo of Pinus is(1) Two tiered
(2) Three tiered
(3) Four tiered
(4) Five tiered
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it's 3) Four tiered.
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Answer:
(3) Four tiered
Explanation:
The pro embryo of Pinus has four distinct tiers, they are- embryonal tier, suspensor tier, rosette tier and open tier. The zygote of Pinus undergoes a series of mitotic divisions. The lower most tiers is the embryonal tier which is far away from the micropylar end.
Next to this tier is the suspension tier and the third from the below is the rosette tier. The fourth and the upper most tier is formed by free nuclei known as open tier and it does takes part in embryo development.
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