Sexual Reproduction in Flowering Plants — Class 12 Biology PYQs

Pollen grains of water pollinated species have special characteristics to protect them. Mention any two such characteristics.
[Max Marks: 1 | Sets: 57/1/2]

Give the reason for the failure of fertilisation in a flower when the pollen and the ovules of that flower mature at different times.
[Max Marks: 1 | Sets: 57/2/2]

Which one of the following plants can serve as a good material for studies on stages of reduction division ?
[Max Marks: 1 | Set: 57/1/3]

Embryo sac of a flowering plant represents :
[Max Marks: 1 | Sets: 57/2/1]

The diagram given below shows labelling of four parts of an anatropous ovule of an angiosperm as 'A', 'B', 'C' and 'D'.
[Image]
Choose the option that indicates the correct labelling of 'A', 'B', 'C' and 'D'.
A B C D
[Max Marks: 1 | Sets: 57/2/3]

Study the diagram of a microsporangium of an angiosperm given below and choose the option which correctly labels 'A', 'B', 'C' and 'D'.
[Image]
[Max Marks: 1 | Set: 57/1/2]

The diagram given below shows labelling of four parts of a dicot embryo during its development as P, Q, R and S.
[Image]
Choose the option that indicates correct labelling of 'P', 'Q', 'R' and 'S' of embryo in different stages of its development :
P Q R S
[Max Marks: 1 | Set: 57/1/1]

How many pollen grains and ovules are likely to be formed in the anther and the ovary of an angiosperm bearing 50 microspore mother cells and 50 megaspore mother cells respectively ?
[Max Marks: 1 | Set: 57/1/1]