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प्रश्न
Distinguish between the following.
Binary fission and Multiple fission
उत्तर
| Binary fission | Multiple fission | |
| i) | Living cells divide to form two similar daughter cells. | Living cells divide into many daughter cells. |
| ii) | Cyst formation does not occur. | Cyst formation occurs. |
| iii) | Nucleus divides into two halves. | Nucleus divides into many nuclei. |
| iv) | It occurs in Amoeba under favourable conditions. | It occurs in Amoeba during unfavourable conditions. |
| v) | Examples: Amoeba, Paramecium | Example: Plasmodium |
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संबंधित प्रश्न
Explain the term “Regeneration” as used in relation to reproduction of organisms
What happens when a Planaria gets cut into two pieces?
How the process of regeneration in Planaria process different from reproduction?
A tadpole develops into an adult frog by the process of ______.
External fertilisation takes place in frogs.
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
What is vegetative propagation?
What is the name of asexual reproduction method in Leishmania?
Name the natural method by which strawberry plants are propagated.
Explain why, more complex multicellular organisms cannot give rise to new organisms through regeneration.
What is meant by the term 'artificial propagation of plants'?
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.
Name one unicellular organism which reproduces by the same asexual process as Hydra.
Name the method by which bread mould (Rhizopus fungus) reproduces. Is this method sexual or asexual?
What is the difference between the cuttings method and grafting method for the artificial propagation of plants?
A multicellular organism which reproduces by budding is :
(a) Amoeba
(b) Yeast
(c) Leishmania
(d) Hydra
Spore formation is the most common asexual method of reproduction in :
(a) protozoa
(b) tubers
(c) fungi
(d) algae
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
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
There are four tiny organisms A, B, C and D. The organism A is a parasitic protozoan which causes a disease known as kala-azar. The organism B is a microscopic single-celled animal which causes malaria disease in human beings. The organism C is a unicellular animal which can change its body shape according to need, it has no fixed shape. The organism D is also a unicellular animal which is slipper-shaped having a large number of tiny hair all around its body.
(a) Name the organisms A, B, C and D
(b) Name one characteristic body feature of organism A.
(c) Name the insect which carries organism B and transmits it from one person to another.
(d) What name is given to the asexual method of reproduction of (i) organism A, and (ii) organism B?
(e) Where do organisms C and D live?
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 filamentous alga X is found in ponds, lakes and slow-moving streams. The filament of this alga simply breaks into two (or more) pieces on maturing and each piece then grows to become a complete new alga.
(a) Name an alga which X is likely to be.
(b) What is the colour of X?
(c) What is the method of forming new algae by the breaking of parent alga known as?
(d) An Amoeba also breaks up to form two daughter Amoebae. What is the difference in the splitting of Amoeba and splitting of this alga as a method of reproduction?
(e) Name one marine animal which reproduces in the same way as alga X.
Briefly explain why a gardener prefers to grow certain plants vegetatively?
With the help of suitable diagram, describe Binary fission in plants.
Multiple choice question. Tick (✓) the correct choice:
Reproduction or propagation by stem is common in
- begonia
- potato
- sweet potato
- Bryophyllum
Fill in the blank:
The amount of cytoplasm in the parent cell is _____ than the amount in the bud.
Find the odd-one out, giving reason.
Cutting, grafting, layering, binary fission.
Define the following:
Grafting
Mention the common method of reproduction in Spirogyra.
Mention the common method of reproduction in Mosses.
Complete the following chart:
| Asexual reproduction | Sexual reproduction | ||
| 1. | Reproduction that occurs with the help of somatic cells is called as asexual reproduction. | 1. | ____________ |
| 2. | ____________ | 2. | Male and female parent are necessary for sexual reproduction. |
| 3. | This reproduction occurs with the help of mitosis only. | 3. | ____________ |
| 4 | ____________ | 4. | New individual formed by this method is genetically different from parents. |
| 5 | Asexual reproduction occurs in different individuals by various methods like binary fission, multiple fission, budding, fragmentation, regeneration, vegetative propagation, spore production, etc. | 5. | ____________ |
Which of the following is a mode of asexual reproduction?
Write four lines on the following: Budding
Name the parts of the plants used to grow following flower: Gladiolus
Give the name of the plant that reproduces vegetatively by: Stem-cutting
Give the name of the plant that reproduces vegetatively by: Underground stem
Grafting is not possible in the monocots because they
Porogamy refers to entry of pollen tube through ____________.
What is protandry?
Name the hormone produced by unfertilised ovary responsible for enlargement of ovary into fruit.
Write a note on different types of endosperms in angiosperms.
Which of the following is not a type of asexual reproduction in multicellular organisms?
Which is the most common method of reproduction in the majority of fungi and bacteria?
______ do not produce spores.
In Spirogyra, asexual reproduction takes place by
The "Eyes" of the potato tuber are ______.
The part of a seed which is a source of food during germination of seed is ______.
Explain with the help of a labelled diagram, the process of reproduction in Hydra by budding. Name the cells used for reproduction in this process.
