Assertion Xenogamy involves transfer of pollen grains from the flower of one plant to the stigma of another plant.
Reason This is the only type of pollination which brings genetically different types of pollen grains to the stigma.
The correct answer is:
Important Questions on Sexual Reproduction in Flowering Plants
Assertion (A): In some plants the generative cell divides and forms the two male gametes during pollen tube growth in stigma.
Reason(R): In plants which shed pollen in three cell stage, the pollen tube will have two male gametes from the beginning.
The correct option among the following is:
(A) Disassociation of microspore as pollen grains
(B) Anther maturation and dehydration
(C) Pollen mother cell undergoes meiotic division
(D) Microspore tetrad
Match the following lists.
| List I | List II |
| A) Animals attracted to flowers by | I) Ophiophily |
| B) Beetles flies are attracted by | II) Safe space to lay eggs by insects |
| C) Pollination by squirrels | III) Colour |
| D) Pollination by snakes | IV) Foul odours |
| E) Amorphophallus | V) Therophily |
The correct match is:
Reason (R) : In Fig plants, pollination takes place by Blastophaga.
The correct option among the following is:
Commelina produces flowers which are open and are similar to flowers of other species with exposed anthers and stigma are called ______.
A typical angiospermic embryo sac, at maturity, contains ________ nuclei and _______ cells.
A) Anther and stigma are placed at different positions.
B) Pollen release and stigma receptivity are not synchronised.
C) Production of unisexual flowers.
D) Pollen release and stigma receptivity are synchronised.
