Question

In Aristolochia elegans the pollen tetrads are of
(1) two types
(2) three types
(3) four types
(4) five types

Answer 1

Here is your answer.

In Aristolochia elegans the pollen tetrads are of five types.
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Answer 2

In 'Aristolachia elegans', the pollen tetrads are of five types.  

EXPLANATION:

Pollen grains are produced within the anther. Pollen grains don't remain united at 'maturity' and dissociate into a 'single pollen grain' called 'monad'. Sometimes, dyads, octads and polyads are also formed.

Tetrads are formed when four pollen grains unite. The tetrads may be arranged in different ways depending on how the pollen grains arrange themselves and unite with each other.