Question

CASE STUDY In angiosperms,the pollen grainsare being transferred  from theanther to the stigma and is termed pollination.This phenomenon was first discovered byCamerarius(1694)in the end of seventeenth century.Pollen grains are immobile.They cannot reachthe stigma by themselves.An external agent is required for this.
a.Which of the following statements is correct regarding P,Qand R?

A PQR introduces genetic variability in the offspring of sexually reproducing plants X and Y.

BWind serves as a agent for process Q if plants X and Y belong to salvia.

C X and Y plant flowers needs to produce nectar and odour for completion of process P and Q if they are entomophilous

D If plants belong to genus Cannabis then their flower needs to produce sticky and heavy pollens for accomplishment of process Q.

Answer 1

B Wind serves as a agent for process Q if plants X and Y belong to salvia.

Answer 2

The correct answer is option (c).

• In the given diagram, P, Q, R represents the process of Geitonomy (self pollination) and Autogamy (self pollination), respectively.
• The pollinating agents are required to complete the process P and Q but to complete the process R, no agent is required.
• Among P, Q and R, only Q is responsible for introducing genetic variability as there is cross pollination between different plants of same species.
• The insect pollinated plant is Salvia and the wind pollinated plant is Cannabis.