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प्रश्न
Mention pollination types.
Explain the different types of pollination.
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उत्तर
- Self-pollination: It is the transfer of pollen grains from the anther to the stigma of the same flower or another flower on the same plant.
- Cross-pollination: It is the transfer of pollen grains from the anther to the stigma of the flower present on two different plants.
APPEARS IN
संबंधित प्रश्न
Match the following:
| Column A | Column B |
| (i) Stigma | (a) Neuron |
| (ii) Pepsin | (b) Carpel |
| (iii) Dendrites | (c) Protein |
| (d) Stamen |
(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:
A flower may have either male or female reproductive parts. Such a flower is called ______.
Explain what you understand by sexual reproduction.
Fill in the following blank with suitable word :
Pollen grains contain ............ gametes of a plant.
Fill in the following blank with suitable word :
The name of the structure in the flower in which the male gamete is formed is...........
Explain the terms 'cross-pollination'?
Give some examples of different modes of fertilisation in nature?
In tobacco plant, the male gametes have 24 chromosomes.
What is the number of chromosomes in the zygote?
What is pollination? How does pollination occur?
Which of the following statements are true for sexual reproduction in flowering plants?
(i) it requires two types of gametes
(ii) fertilisation is a compulsory event
(iii) it always results in the formation of zygote
(iv) offsprings formed are clones
(a) (i) and (iv)
(b) (i), (ii) and (iv)
(c) (i), (ii) and (iii)
(d) (ii), (iii) and (iv)
Fill in the blank by selecting suitable word:
A flower bearing only male or female parts is known as __________ flower.
Multiple choice question. Tick (✓) the correct choice:
The male gamete is present inside the which germinates.
- the style
- the stigma
- the anther
- the ovary
Fill in the blanks:
A stamen consists of ______ and ________.
Fill in the blank:
Seeds are formed from________.
State whether the following statement is true (T) or false (F):
Stamens make egg cells.
State whether the following statement is true (T) or false (F):
Flowers which possess stamens and carpel are called unisexual.
Mention the function of Stigma.
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.
A student is asked to study the different parts of an embryo of pea seeds. Given below are the essential steps for the experiment :
(I) Soak the pea seeds in plain water and keep them overnight.
(II) Cut open the soaked seed and observe its different parts.
(III) Take some pea seeds in a petri dish.
(IV) Drain the excess water. Cover the seeds with a wet cotton cloth and leave them as it is for a day.
The correct sequence of these steps is
(A) III, I, IV, II
(B) III, IV, I, II
(C) III, I, II, IV
(D) III, II, I, IV
Write the names of male and female reproductive parts of a flower.
Give scientific reason.
Fertilization in plants is called double fertilization.
The anther wall consists of four wall layers where ______
The ovule of an angiosperm is technically equivalent to ______
Which of the following are the chemical components of the wall of pollen tube?
Generally, in a pollen tube, which of the following moves to the tip of the tube?
The 3-celled egg apparatus at the micropylar end comprises of ______
What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its roots tip cells?
Variations occur as a result of ______
Complete the table
| Carly x | ______ | ______ |
| ______ | petal | attract insects |
| Androecium | ______ | Male reproductive part |
| ______ | ______ | Female reproductive part. |
Trace the path a male gamete takes to fertilise a female gamete after being released from the penis.
Name the reproductive parts of an angiosperm. Where are these parts located? Explain the structure of its male reproductive part.
What is puberty?
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.
State the post-fertilisation changes that lead to fruit formation in plants.
