For chemical defence against herbivores, Calotropis has :
Consider the following tissues in the stelar region of a stem showing secondary growth.
(A) Primary xylem
(B) Secondary xylem
(C) Primary phloem
(D) Secondary phloem
Arrange these in the correct sequence of their position from pith towards corts.
Which out of the following statements is incorrect?
In angiosperms the correct sequence of events in formation of female gametophyte in the ovule is :
(A) 3 successive free nuclear divisions functional megaspore.
(B) Degeneration of 3 megaspores.
(C) Meiotic division in megaspore mother cell.
(D) Migration of 3 nuclei towards each pole.
(E) Formation of wall resulting in seven celled embryosac.
Choose the correct answer from the options given below :
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