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प्रश्न
For binary fission, Amoeba required .................... parent cells.
(a) Three
(b) Two
(c) One
(d) Zero
उत्तर
(c) One
Amoeba undergoes asexual reproduction by binary fission. In this method, a single parent cell divides into two equal or nearly equal parts. Each part grows into a new individual.
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संबंधित प्रश्न
Label the parts (1) and (2) in budding of yeast cell.
Explain the term “Regeneration” as used in relation to reproduction of organisms
Name the following : 'Blobs' that develop at the tips of the non-reproductive threads in Rhizopus.
Explain the process of regeneration in Planaria.
List two advantages of vegetative propagation.
How will an organism be benefited if it reproduces through spores?
Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?
How are the modes for reproduction different in unicellular and multicellular organisms?
Define asexual reproduction.
A student while observing an embryo of a gram seed listed various parts of the embryo as listed below :
Testa, Micropyle, Cotyledon, Tegmen, Plumule, Radicle. On examining the list the teacher commented that only three parts are correct. Select these three correct parts :
(a) Cotyledon, Testa, Plumule
(b) Cotyledon, Plumule, Radicle
(c) Cotyledon, Tegmen, Radicle
(d) Cotyledon, Micropyle, Plumule
Draw in sequence (showing the four stages), the process of binary fission in Amoeba.
Describe reproduction by spores in Rhizopus
Name two plants which can be grown from their broken stems.
Name one organism which reproduces by binary fission and another which reproduces by multiple fission.
State whether the above named organisms are animals or plants.
Name two organisms which reproduce by the same asexual process as that of Amoeba.
Name two fruit trees which are usually propagated by grafting method.
What is tissue culture?
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 types of organisms which produce colonies by the process of budding are :
(a)Hydra and Corals
(b) Yeast and Sponges
(c) Corals and Sponges
(d) Hydra and 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
An organism having a whip-like structure at one end which reproduces by the process of binary fission is :
(a) Hydra
(b) Paramecium
(c) Leishmania
(d) Plasmodium
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
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?
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 :
Fusion of gametes gives rise to a single cell called ............
Fill in the following blank with suitable word :
The process of fusion of gametes is called .............
Fill in the blank:
Budding produces cells of __________ size.
State whether the following statement is true (T) or false (F):
A whole new plant can grow from the eye of a tuber.
What is fragmentation in organisms?
Explain the term Vegetative propagation.
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).
Observe the given picture and answer the questions given below.
- State the type of reproduction.
- Identify the part of reproduction.
Sweet potato - _____________
Bryophyllum - _____________
Potato - _____________
Draw a neat and labelled diagram.
Spore formation
Asexual reproduction takes place through budding in ______.
Many unicellular organisms reproduce by the process of ______
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
Can you consider cell division as a type of reproduction in unicellular organism? Give one reason.
The symbiotic association between fungi and algae is called ______.
