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प्रश्न
Define.
Fragmentation
उत्तर
The process of asexual reproduction in which the parent body breaks into many pieces or fragments and the fragments develop into mature filaments is known as fragmentation.
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संबंधित प्रश्न
Differentiate between 'stem tuber' and 'tuberous root'.
Explain the term “Regeneration” as used in relation to reproduction of organisms
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.
Name the following : 'Blobs' that develop at the tips of the non-reproductive threads in Rhizopus.
Explain the process of regeneration in Planaria.
How does Plasmodium reproduce. Is this method sexual or asexual?
..................... type of reproduction occurs in Hydra.
(a) Binary fission
(b) Multiple fission
(c) Budding
(d) Fragmentation
Name two plants which can be grown from their broken stems.
Name two organisms which reproduce by the same asexual process as that of Amoeba.
Name the method by which bread mould (Rhizopus fungus) reproduces. Is this method sexual or asexual?
What care should be taken while making a cutting from a plant?
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
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 two organisms which can regenerate fully from their cut body parts are :
(a) Paramecium and Hydra
(b) Hydra and Amoeba
(c) Planaria and Leishmania
(d) Hydra and Planaria
Spore formation is the most common asexual method of reproduction in :
(a) protozoa
(b) tubers
(c) fungi
(d) algae
The cut part of plant stem (having roots and fixed to ground) which is used in the process of grafting is known as :
(a) stock
(b) scion
(c) cutting
(d) bud
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.
Define the following:
Grafting
Mention the common method of reproduction in Rose.
Describe the advantages of vegetative reproduction.
Name the following :
Explain the structure and the function of the structures released from the ‘blobs’ in Rhizopus.
A student after viewing a prepared slide illustrates the budding in yeast in the following order which is not correct:
(A) b, c, d, e, a
(B) b, e, d, c, a
(C) b, d, e, c, a
(D) b, d, c, e, a
A student was given two permanent slides, one of binary fission in Amoeba and other of budding in yeast. He was asked to identify any one difference in the nucleus of the two. One such difference, he identified correctly was
(1) Presence of one nucleus in Amoeba, two in yeast cell and one in bud.
(2) Presence of two nuclei in centrally constricted Amoeba, one in yeast cell and one in its bud.
(3) Presence of two distant nuclei in Amoeba, one in yeast cell and two in bud.
(4) Presence of a single nucleus each in Amoeba, yeast cell and its attached bud.
Binary fission is observed in which one of the following figures?
A yeast cell in which budding occurs was seen to have:
(1) one bud cell
(2) two bud cell
(3) three bud cell
(4) a chain of bud cells
Define vegetative propagation. List its two methods.
Name the parts of the plants used to grow following flower: Lily
Give the name of the plant that reproduces vegetatively by: Bulbils
Why anther is called as tetrasporangiate structure?
Asexual reproduction occurs by __________ cell division.
A piece of wet bread or bhakri kept in a humid place for 2-3 days, then
- What will you observe?
- State the scientific name of the living organism and write its characteristics.
Vegetative propagation by leaves takes place in ______.
A feature of reproduction that is common to Amoeba, Yeast, and Spirogyra is that ______
The ability of a cell to divide into several cells during reproduction in Plasmodium is called ______
In Spirogyra, asexual reproduction takes place by
Length of pollen tube depends on the distance between
Which of the following statements are true for flowers?
- Flowers are always bisexual
- They are the sexual reproductive organs
- They are produced in all groups of plants
- After fertilisation they give rise to fruits
Suppose there is one member of a particular kind of organism in a culture dish, which doubles itself in one hour through asexual reproduction. Work out the number of members of that kind of organism which will be present in the culture dish after ten hours. Such a colony of individuals arising from one parent is called a “clone”.
