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प्रश्न
What is meant by asexual reproduction?
उत्तर १
Asexual reproduction is a mode of reproduction in which offspring arise from a single parent.
उत्तर २
The process of formation of a new organism by an organism of the same species without the involvement of gametes is called asexual reproduction.
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संबंधित प्रश्न
For binary fission, Amoeba required .................... parent cells.
(a) Three
(b) Two
(c) One
(d) Zero
Yeast reproduces by _________.
(a) spore formation
(b) multiple fission
(c) fragmentation
(d) budding
Draw labelled diagrams to illustrate budding in Hydra.
On cutting the body of an organism into many pieces it was observed that many of these pieces developed as new individuals. Name the process and list two organisms in which this process may be observed. Draw a schematic diagram to illustrate the changes that are likely to be observed during the development of new individuals in any one of the organisms named.
Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?
Name the natural method by which strawberry plants are propagated.
Why does bread mould grow profusely on a moist slice of bread but not on a dry slice of bread?
Why do green grass plants spring up in dry fields on their own after the rains?
Name a tiny fresh-water animal which reproduces by the same method as that of yeast? What is this method known as?
What is meant by 'grafting' as a means of propagation in plants?
An organism which may be considered to be a kind of plant and reproduces by budding is :
(a) Paramecium
(b) Bread mould
(c) Hydra
(d) Yeast
The organisms which can reproduce by fragmentation are :
(a) Corals and Sponges
(b) Corals and Spirogyra
(c) sea anemone and Spirogyra
(d) Sponges and Sea anemones
Stock and scion are involved in the artificial propagation method known as :
(a) tissue culture
(b) layering
(c) grafting
(d) cuttings
Two very small organisms X and Y both reproduce by the method of budding. Organism X is industrially very important because it is used in making alcohol from sugar. It is also used in making bread. Organism Y Lives in freshwater. If organism Y gets cut into a number of parts accidently, each cut part can grow to form complete organism.
(a) What are organisms X and Y?
(b) What is the name of the process in which X converts sugar into alcohol?
(c) To which class of organisms does X belong?
(d) Name an important body feature of organism Y.
(e) Which organism is multicellular and which one is unicellular?
When a moist slice of bread was kept aside for a few days then some organism grew on it to form a white cottony mass which later turned black. When this slice of bread was observed through a magnifying glass, then fine thread-like projections and thin stems having bulb-like structures at the top were seen.
(a) What is the common name and scientific name of the organism which grew on the moist slice of bread?
(b) How did this organism grow on the moist slice of bread automatically?
(c) What are the fine, thread-like projections on the surface of slice of bread known as?
(d) What name is given to the knob-like structures and what do they contain?
(e) What is the name of this method of reproduction?
(f) Name one unicellular organism which reproduces by this method.
(g) Name tow non-flowering plants which reproduce by this method.
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?
Fill in the following blank with suitable word :
The process of fusion of gametes is called .............
What is vegetative reproduction?
Multiple choice question. Tick (✓) the correct choice:
Budding is commonly seen in
- yeast
- grasses
- Amoeba
- Spirogyra
Fill in the blank:
Budding produces cells of __________ size.
State whether the following statement IS true (T) or false (F):
Asexual reproduction is more common than the sexual reproduction.
Define the following:
Budding
Mention the common method of reproduction in Bacteria.
Mention the common method of reproduction in Spirogyra.
Mention the common method of reproduction in Strawberry.
What happens when on maturation sporangia burst?
Choose the correct alternative and rewrite the following:
Fermentation is a type of ____________________.
Write a note on different types of endosperms in angiosperms.
Define.
Vegetative propagation
Distinguish between sexual and asexual reproduction.
Vegetative propagation by leaves takes place in ______.
The ability of an organism to develop a whole body from a broken piece or fragment is called ______
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.
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?
Vegetative reproduction of Agave occurs through ______.
Plants like (vlmus), Dandelion (Taraxacum) and members of Rose family vegetative reproduce by ______.
