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प्रश्न
Distinguish between self-pollination and cross-pollination.
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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.
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संबंधित प्रश्न
A student identified the various parts of an embryo of a gram seed and listed them as given below :
(I) Testa
(II) Plumule
(III) Radicle
(IV) Cotyledon
(V) Tegmen
Out of these the actual parts of the embryo are :
(A) I, II, III
(B) II, III, IV
(C) III, IV, V
(D) II, IV, V
Mature ovary forms the ______.
Name the male part of the flower.
What are the reproductive organs in a flower?
What is the name of female part of a flower?
Fill in the following blank with suitable word :
The.......... at the base of the carpel contains egg cells.
Fill in the following blank with suitable word :
The term used to refer to the transfer of pollen from the stamen of one flower to the carpel of another flower of the same species is...........
Explain the terms 'self pollination'
Explain the term 'fertilisation'.
What type of plants reproduce by sexual reproduction method?
What is seed?
Name the part of a seed which contains stored food.
What is meant by ‘unisexual flowers’?
Which of the following statements are true for flowers?
(i) Flowers are always bisexual.
(ii) They contain sexual reproductive organs.
(iii) They are produced in all groups of plants.
(iv) after fertilization they give rise to fruits.
What is a flower ? Draw a neat labelled diagram showing the L.S. of a typical flower.
(a) Identify A, B and C in the given diagram and write their functions.
(b) Mention the role of gamete and zygote in sexually reproducing organisms.
List any two differences between pollination and fertilization.
Sketch the labelled diagram.
Flower with its sexual reproductive organs.
Fill in the blank by selecting suitable word:
Transfer of pollen grains from the anther to the stigma is known as______________.
Answer the following question.
List two agents of pollination?
Find the odd one out:
Bisexual : Hibiscus : : Unisexual : ___________
Accessory whorls : Calyx and corolla : : essential whorls : ______________
Write the events involved in the sexual reproduction of a flowering plant.
Discuss the first event and write the types.
Generally, in a pollen tube, which of the following moves to the tip of the tube?
How many middle layers are generally present in the wall of the anther lobes?
What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its roots tip cells?
In human beings, fertilization occurs in the ______
Variations occur as a result of ______
Which out of the following processes does not lead to the formation of clones.
Double fertilization means ______.
What is the function of calyx?
Name the reproductive parts of an angiosperm. Where are these parts located? Explain the structure of its male reproductive part.
In flowering plants, the pollen grains are transferred to stigma by pollination but the female germ cells are present in the ovary.
Explain with the help of a labelled diagram (only concerned parts), how the male germ cell reaches the ovary.
State the post-fertilisation changes that lead to fruit formation in plants.
In male reproductive whorl of a flower the archesporial cells are formed by ______.
The number of pollen sacs in a dithecous anther is ______.
