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प्रश्न
How is plant hybridisation carried out?
उत्तर
Plant hybridisation is a time consuming process and is carried out between two plants of different species or between two varieties of the same species.
Two parent plants are selected of which one parent has the desired characters. On the female plant, emasculation is carried out i.e. stamens are removed to prevent undesirable fertilization. Then pollen of the male plant is collected and artificially brushed on stigma of emasculated flower. The emasculated flower is kept bagged before and after fertilization to prevent any unwanted cross pollination. After pollination, fertilization takes place and seeds of desired variety are produced.
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संबंधित प्रश्न
Describe the cuttings method for the artificial propagation of plants. Illustrate your answer with the help of labelled diagrams.
What is vegetative reproduction?
State whether the following statement is true (T) or false (F):
Reproduction by spores is a method of asexual reproduction.
Mention the common method of reproduction in Bougainvillea.
From the following diagrams, select the correct ones showing stages of binary fission in Amoeba:
(A) I, II, III
(B) IV, II, III
(C) V, II, III
(D) IV, I, III
A yeast cell in which budding occurs was seen to have:
(1) one bud cell
(2) two bud cell
(3) three bud cell
(4) a chain of bud cells
Which of the following is not a type of asexual reproduction in multicellular organisms?
A piece of wet bread or bhakri kept in a humid place for 2-3 days, then
- What will you observe?
- State the scientific name of the living organism and write its characteristics.
In the following Question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: Amoeba reproduced by fission.
Reason: All unicellular organisms are reproduced by the asexual method.
In an asexually reproducing species, if a trait X exists in 5% of a population and trait Y exists in 70% of the same population, which of the two trait is likely to have arisen earlier? Give reason.
