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प्रश्न
What determines whether the two organisms of a species will be exactly similar or not?
उत्तर
The similarity or difference between the organisms of a species depends upon whether these individuals are formed by sexual reproduction or asexual reproduction.
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संबंधित प्रश्न
Vegetative propagation takes place with the help of leaves in _________ plant.
Name two simple organisms having the ability of regeneration.
When you study a slide showing different stages of budding in yeast, you observe the following stages:-
I. The bud may get separated from the parent body and develop into a new individual.
II. The body of the bud develops and gives rise to another baby bud.
III. A bud comes out in any direction from the body of the parent cell.
IV. Thus they may form a colony.
The proper sequence of the above stages is
(A) II, I, III, IV
(B) II, III, I, IV
(C) III, II, l, IV
(D) III, I, II, IV
A student is observing a permanent slide showing sequentially the different stages of asexual reproduction taking place in yeast. Name this process and draw diagrams, of what he observes, in a proper sequence.
Name the type of asexual reproduction in which two individuals are formed from a single parent and the parental identity is lost. Draw the initial and the final stages of this type of reproduction. State the event with which this reproduction starts.
Write two differences between binary fission and multiple fission in a tabular form.
Name the process by which an Amoeba reproduces. Draw the various stages of its reproduction in a proper sequence.
Name two plants which can be grown from their broken stems.
What is the name of asexual reproduction method in Leishmania?
Name the natural method by which strawberry plants are propagated.
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.
Define 'stock' and 'scion'.
Name two fruit trees which are usually propagated by grafting method.
The disease kala-azar is caused by a micro-organism known as :
(a) Planaria
(b) Leech
(c) Leishmania
(d) Plasmodium
One of the following reproduces by forming spores. This in :
(a) Fern
(b) Planaria
(c) Spirogyra
(d) Potato
Asexual reproduction through budding takes place in :
(i) Amoeba and Yeast
(ii) Yeast and Hydra
(iii) Hydra and Plasmodium
(iv) Corals and Sponges
(a) (i) and (ii)
(b) only (ii)
(c) (i) and (iii)
(d) (ii) and (iv)
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
A thickened underground stem X of a plant which is swollen with stored food has a number of points Y on its surface. When the old stem X is planted in the soil of a field in the next growing season, then each point Y present on its surface grows into a new plant.
(a) What is the general name of the underground stems like X?
(b) Give one example of X.
(c) What are points Y present on X known as?
(d) Is it necessary to plant the whole of stem X in the ground to obtain its new plants? Explain your answer.
(e) What is the name of this method of reproduction of plants?
(f) What is the advantage of growing new plants from the underground stems like X?
When a broken piece of the stem of a plant X is planted in the soil, a new plant grows from it in a week's time. The leaves of plant X also have many small entities Y in their margins which can fall to the ground alone or alongwith leaves and grow into new plants.
(a) Name a plant which X could be.
(b) What are the entities Y present on the leaves of X known as?
(c) Name a plant other than X which can be reproduced from its leaves.
(d) Name a common plant grown in many homes which can be propagated from its broken stems like plant X.
(e) Name a kind of dormant organs present in dry stems of old grass plants lying in the fields which get activated and produce green grass plants after the rains.
Write a short note on Vegetative reproduction.
Fill in the blank:
Budding produces cells of __________ size.
Mention the common method of reproduction in Bacteria.
Name the following :
Explain the structure and the function of the structures released from the ‘blobs’ in Rhizopus.
After observing the prepared slides of binary fission in Amoeba and budding in yeast following observations were reported:
(a) Single cells of Amoeba and yeast were undergoing binary fission and budding respectively.
(B) Cytokinesis was observed in the yeast cell.
(C) Elongated nucleus was dividing to form two daughter nuclei in Amoeba.
(D) A chain of buds were observed due to reproduction in Amoeba.
The correct observation(s) is/are:
(A) a and c
(B) b only
(C) c and d
(D) d, a and c
What is meant by asexual reproduction?
Describe regeneration in Planaria with the help of a suitable diagram.
Explain asexual reproduction in plants.
How is plant hybridisation as a technique beneficial?
The form of vegetative reproduction of plants where seeds are formed without fusion of gametes is called
Explain the development of male gametophyte in angiosperms (diagram is not expected).
Vegetative propagation by leaves takes place in ______.
Asexual reproduction takes place through budding in ______.
During favourable conditions, Amoeba reproduces by ______
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.
Which of the following statements is/are true for sexual reproduction in plants?
(i) Plants are obtained from seeds.
(ii) Two plants are always essential.
(iii) Fertilisation can occur only after pollination.
(iv) Only insects are agents of pollination.
Choose from the options given below.
In the diagram given in Figure 12.2 label the parts marked (a), (b) and (c).
When you keep food items like bread and fruits outside for a long time, especially during the rainy season, you will observe a cottony growth on them.
What is this growth called?
The symbiotic association between fungi and algae is called ______.
