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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
Students were asked to observe the permanent slides showing different stages of budding in yeast under high power of a microscope.
(A) Which adjustment screw (coarse/fine) were you asked to move to focus the slides?
(B) Draw three diagrams in correct sequence showing budding in yeast.
Draw a labelled diagram to show that particular stage of binary fission in amoeba in which its nucleus elongates and divide into two and a constriction appears in its cell membrane.
How does multiple fission occur in an organism? Explain briefly.
What happens when a Planaria gets cut into two pieces?
How does Planaria reproduce? Is this method sexual or asexual?
Name one organism which reproduces by spore formation
What is the name of asexual reproduction method in Leishmania?
Fill in the following blanks with suitable words :
Plasmodium reproduces by the process of ............ fission whereas Paramecium reproduces by the process of ......... fission.
Explain vegetative propagation with the help of two examples. List two advantages of vegetative propagation.
Name two plants which are usually propagated by artificial propagation methods. Name the method of artificial propagation used in each case.
Describe the layering method for the artificial propagation of plants. Illustrate your answer with the help of a labelled diagram. Name any five plants which are propagated by the layering method.
What is a tuber? Name one stem tuber and one root tuber.
Name one commonly used vegetable which is propagated by using tubers.
How can you grow money plant by vegetative propagation?
Name the method by which bread mould (Rhizopus fungus) reproduces. Is this method sexual or asexual?
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
The stem of a fruit tree X fixed in soil is cut in a slanting way. The upper part of stem of another fruit tree Y of different variety of same species is also cut in a slanting way. The cut stem of tree Y, without roots but having some leaves, is placed over the rooted cut stem of tree X in such a way that their cut surfaces fit together properly. While joining the two cut stems, care is taken to make sure that the layer Z of one cut stem is in contact with layer Z of the other cut stem. The joint of cut stem is bound tightly with a piece of cloth and covered properly with polythene. Soon the cut heals and the two stems grow together and become one fruit tree producing leaves, flowers and fruits.
(a) What is the name of this method of producing plants or trees?
(b) What name is given to the cut stem of tree X having roots?
(c) What name is given to the cut stem of tree Y which has no roots but has some leaves?
(d) Name the layer Z.
(e) Why should the layer Z of one cut stem be in contact with the layer Z of the other cut stem?
(f) Name any four fruit trees which are usually bred by this technique.
(g) State any one advantage of producing fruit trees by this technique.
A small part of the shoot of a plant is removed with a sharp knife. When the lower end of this small part of the shoot is buried in moist soil, it gradually develops roots and shoots and grows to become a new plant.
(a) What is the name of this method of propagating plants?
(b) What care should be taken while removing a small part of the shoot from the parent plant with a knife?
(c) Name any two plants which provide us with food directly or indirectly and are grown by this method.
(d) Give one advantage of this method of producing new plants.
(e) State whether it is a sexual method of reproduction or an asexual method. Why?
(f) What special name can be given to the genetically identical new plants produced by this technique?
Describe the various methods of vegetative reproduction.
Explain the process of budding in Hydra.
List two advantages of vegetative reproduction practiced in case of an orange plant.
Describe regeneration in Planaria with the help of a suitable diagram.
Binary fission is observed in which one of the following figures?
Define vegetative propagation. List its two methods.
List two observations on the basis of which it may be concluded that the given slide shows binary fission in Amoeba.
The form of vegetative reproduction of plants where seeds are formed without fusion of gametes is called
Porogamy refers to entry of pollen tube through ____________.
Define.
Fragmentation
Distinguish between the following.
Binary fission and Multiple fission
The asexual reproduction in bacteria occurs by ______.
Which is the most common method of reproduction in the majority of fungi and bacteria?
The ability of an organism to develop a whole body from a broken piece or fragment is called ______
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?
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.
How does the growth take place?
In the diagram of a bisexual flower given in Figure 12.5, draw the missing part and label the parts marked (a), (b) and (c). Also, label the missing part that you draw
What is Regeneration?
