Sporopollenin can protect pollen grains from adverse environmental conditions and also maintain their viability over several years.
Technically stamens are called microsporophyll. True or false?
- one or two
- two or three
- only two
Match the following
Column -I Column- II
(i) Exine (a) Sporopollenin absent
(ii) Intine (b) Tube cell
(iii) Germ pore (c) Thin continuous layer
(iv) Vegetative cell (d) Fertile cell
(v) Generative cell (e) Thick porous layer
(i) -(e), (ii) - (c). (iii) -(a), (iv) -(d) , (v)- (b)
(i) -(e), (ii) -(c), (iii)-(a), (iv) -(b) , (v) -(d)
(i) -(e), (ii) -(d), (iii)- (c), (iv) -(b) , (v) -(a)
(i) -(a), (ii) -(b) , (iii)-(c), (iv) -(d), (v) - (e)
Parthenium came to India as a seed contaminant along with
None of the above
Regarding assertion and reason, select the right option.
Assertion (A): Pollen grains have a tough outer covering.
Reason (R): Pollen grains differs in size, shape, colour and design.
Both A and R are correct and R explains A
Both A and R are correct and R does not explain A
A is correct and R is incorrect
A and R are incorrect
Which of the following statements are correct with respect to pollen grains?
- Each microspore develops into pollen grains.
- Pollen grains represent male gametophytes.
- Pollen grains are generally spherical in shape.
- Pollen grains are viable even after fossilisation.
(i), (ii) & (iii)
(ii) & (iv)
(i) & (iii)
(ii) & (iii)
- endothecium of anther
- tapetum of anther
- intine of pollen grain
- exine of pollen grain
- In vitro fertilization
- Breeding programmes
- Supplementing food
- Ex-situ conservation