Advertisements
Advertisements
प्रश्न
Distinguish between self-pollination and cross-pollination.
Advertisements
उत्तर
In self-pollination, only one or two flowers borne on the same plant are involved, whereas in cross-pollination two flowers borne on two plants of same species are involved.
APPEARS IN
संबंधित प्रश्न
How does fertilisation occur in flowers? Name the parts of the flower that develop into (i) seed, and (ii) fruit after fertilisation.
(i) Name the part marked 'A' in the diagram.
(ii) How dose 'A' reachese part 'B'?
(iii) State the importance of the part 'C'.
(iv) What happens to the part marked 'D' after fertilisation is over?
Name and differentiate between the two modes of pollination in flowering plants.
Name the parts labelled as A, B, C and D in the diagram given below:
The fusion of male and female gametes is termed as ______.
Fill in the following blank with suitable word :
The ovule becomes a .......... after fertilisation.
What is made in anther of a flower?
Explain the terms 'cross-pollination'?
Name the part of a seed which grows into shoot.
What is meant by 'unisexual flowers' and 'bisexual flowers'? Give two examples of each.
(a) Draw a neat diagram of a flower showing its various parts. In this diagram mark stem, receptacle, sepals, petals, stamen and carpel.
(b) What name is given to (i) all the petals of a flower, and (ii) all the sepals of a flower?
(c) What are (i) stamen, and (ii) carpel, in a flower?
(d) What is the other name of carpel of a flower?
(e) What is the name of yellow powdery substance present in the anther of a flower?
Which among the following statements are true for unisexual flowers?
(i) They possess both stamen and pistil
(ii) They possess either stamen or pistil
(iii) They exhibit cross pollination
(iv) Unisexual flower possessing only stamens cannot produce fruits
(a) (i) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (i), (iii) and (iv)
Fill in the blanks:
A carpel consists of ________ , ________ and ________.
Fill in the blanks:
A stamen consists of ______ and ________.
State whether the following statement is true (T) or false (F):
Stamens make egg cells.
Mention the function of Stigma.
What part is played by stamens and carpels in reproduction?
Draw a diagram of the longitudinal section of a flower exhibiting germination of pollen on stigma and label (i) ovary, (ii) male germ-cell, (iii) female germ-cell and (iv) ovule on it.
Distinguish between unisexual and bisexual flowers giving one example of each. Draw a diagram showing process of germination of pollen grains on stigma and label the following parts:
(a) Female germ cell
(b) Male germ cell
(c) Ovary
Draw a diagram of the longitudinal section of a flower and label on it sepal, petal, ovary and stigma.
Fill in the blank by selecting suitable word:
Transfer of pollen grains from the anther to the stigma is known as______________.
Mention pollination types.
Differentiate between self-pollination and cross-pollination.
Pollen tube reaches the embryo sac via style.
Pollen grains from anther are transferred to the stigma.
What does germination mean?
Write the functions of sepals
The male reproductive part of a flower is ______.
In which part of the flower germination of pollen grains takes place?
Pineapple fruit develops from ______.
Conidia are formed endogenously while zoospores are formed endogenously.
In human beings, fertilization occurs in the ______
In a bisexual flower inspite of the young stamens being removed artificially, the flower produces fruit. Provide a suitable explanation for the above situation.
What is puberty?
The pollen tube usually enters the embryo sac ______.
Explain the post fertilization changes that occur in the ovary of a flower.
Given below is a diagram of a germinating seed. Label the parts that:
- gives rise to future shoot.
- gives rise to future root system.
- stores food.
