Biology
Mamta is curious to study different kinds of pollination among flowers present in her garden. She has performed artificial pollination in the following ways :
P. Pollination within a flower.
Q. Pollination between flowers of same plant.
R. Pollination between two flowers of two different plants of same species.
S. Pollination between two flowers of two different plants of the different species.
Which of the ways given above explains 'cross-pollination'?
- Only R
- Only P, Q and S
- Only P, R and S
- Only P and S
Answer
Only R
Reason — Cross-Pollination occurs between two flowers on different plants of the same species.
Pollination within a flower is called self-pollination. Pollination between flowers of the same plant is also called self-pollination. Pollination between flowers of different species is not cross-pollination within the same species and normally does not result in fertilisation.
Related Questions
Sanjay, a research scholar wants to develop a desired variety of Guava in his orchard. Which of the following methods of vegetative propagation will be the most suitable for him?
- Cutting
- Grafting
- Layering
- Micropropagation
Flowers borne on the shoot system of a plant serve as reproductive part. Which of the following reasons supports this statement ?
P. Flowers bear stamens and carpels.
Q. Flowers make the plant attractive.
R. Flowers produce fruits with seeds.- Only P
- Only Q
- Only P and R
- Only Q and R
Cross-pollination is considered better than self-pollination because it produces healthier and more viable seeds. But it cannot occur by itself. Cross-pollination occurs with the help of certain agents like wind, water, insects, etc. Which of the following features of flowers are not suitable for insect-pollination ?
P. Flowers are usually small and of dull colours.
Q. Flowers are not scented and do not produce nectar.
R. Flowers produce sticky pollen grains.- Only Q
- Only Q and R
- Only P and R
- Only P and Q
Assertion (A): Carrot is a biennial plant which stores food material in its roots in the first year.
Reason (R): This food is utilized in the second year to produce flowers and viable seeds, i.e. to reproduce sexually.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.