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Exine of pollen grains is made up of: 

Let A be a matrix such that A³ = 0. Then (I – A)⁻¹ is equal to: 

The entry of pollen tube through integuments is called: 

Synergids help in: 

Endosperm in angiosperms is formed as a result of: 

Which one of the following is the most resistant biological material? 

Let A and B be square matrices of same order such that AB = BA. Then which of the following is true? 

Double fertilization is: 

If A is a 2×2 matrix such that A² = I, then which of the following is always true? 

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