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प्रश्न
Explain the importance of the reproduction process.
उत्तर
Importance of reproduction:
- It helps in the process of evolution.
- It also helps in existence/survival of a species of an organism.
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संबंधित प्रश्न
Differentiate between 'stem tuber' and 'tuberous root'.
A student has to focus his compound microscope to observe a prepared slide showing different stages of binary fission in Amoeba. The steps he is likely to follow are listed below in a haphazard manner:
I. Adjust the diaphragm and the mirror of the microscope so that sufficient light may enter to illuminate the slide.
II. Fix the slide on the stage carefully.
III. Adjust the microscope to high power and focus.
IV. Adjust the microscope to low power and focus.
The correct sequence of the above steps to observe the slide under the microscope is
(A) I, II, IV, III
(B) II, I, IV, III
(C) II, IV, I, III
(D) I, IV, II, III
State whether the following statement is true or false :
Spores produced by the bread mould plant are actually its seeds.
Fill in the following blank with suitable word :
Vegetative reproduction of potato plants is done by using ............
The yeast cells fail to multiply in water but they multiply rapidly in sugar solution. Give one reason for it.
What is meant by multiple fission? Name one organism which reproduces by the process of multiple fission.
State two advantages of grafting method of artificial propagation of plants.
What is the difference between the cuttings method and grafting method for the artificial propagation of plants?
The unicellular organism which reproduces by budding is :
(a) Spirogyra
(b) Hydra
(c) Planaria
(d) Yeast
A feature of reproduction that is common to Amoeba, Yeast and Bacterium is that :
(a) they are all multicellular
(b) they are all unicellular
(c) they reproduce only sexually
(d) they reproduce asexually
Vegetative propagation refers to the formation of new plants from the following existing organs of the old plants :
(a) stems, roots and flowers
(b) stems, roots and leaves
(c) stems, flowers and fruits
(d) stems, leaves and flowers
The two organisms which can regenerate fully from their cut body parts are :
(a) Paramecium and Hydra
(b) Hydra and Amoeba
(c) Planaria and Leishmania
(d) Hydra and Planaria
A tiny animal having tentacles which reproduces by growing buds on the sides of its body is :
(a) Planaria
(b) Yeast
(c) Amoeba
(d) Hydra
Write a short note on Micro propagation.
Write a short note on Vegetative reproduction.
Mention the common method of reproduction in Dahlia.
Describe the various methods of vegetative reproduction.
A student after observing a slide showing different stages of binary fission in Amoeba draws the following diagrams. However these diagrams are not in proper sequence:
The correct sequence is:
(A) I, V, IV, III, II
(B) I, III, IV, V, II
(C) I, V, III, IV, II
(D) I, IV, V, III, II
What is fragmentation in organisms?
What is regeneration in organism?
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
Gemmule formation takes place in ________.
Choose the correct alternative and rewrite the following:
Ramesh observed a slide of Amoeba with elongated nuclei. It would represent _______________.
Why is chemical communication better than electrical impulses as a means of communication between cells in a multi-cellular organism?
Give the name of the plant that reproduces vegetatively by: Grafting
The form of vegetative reproduction of plants where seeds are formed without fusion of gametes is called
Find an odd one out.
What determines whether the two organisms of a species will be exactly similar or not?
Distinguish between the following.
Binary fission and Multiple fission
Asexual reproduction takes place through budding in ______.
Offspring formed by the asexual method of reproduction have greater similarities among themselves because ______
(i) asexual reproduction involves only one parent
(ii) asexual reproduction does not involve gametes
(iii) asexual reproduction occurs before sexual reproduction
(iv) asexual reproduction occurs after sexual reproduction
In Spirogyra, asexual reproduction takes place by
In the diagram given in Figure 12.2 label the parts marked (a), (b) and (c).
Rajesh observed a patch of greenish black powdery mass on a stale piece of bread.
Name the organism responsible for this and its specific mode of asexual reproduction.
Mustard was growing in two fields- A and B. While Field A produced brown coloured seeds, field B produced yellow coloured seeds.
It was observed that in field A, the offsprings showed only the parental trait for consecutive generations, whereas in field B, majority of the offsprings showed a variation in the progeny.
What are the probable reasons for these?
Methods of asexual reproduction in lower organisms include ______
In the figure given below the plant bears two different types of flowers marked ‘A’ and ‘B’. Identify the types of flowers and state the type of pollination that will occur in them.
