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प्रश्न
Differentiate between the following:
Binary fission and budding
उत्तर
Binary fission
- It is the kind of asexual reproduction in which a parent cell splits into two new organisms of same size.
- Mostly unicellular organisms like bacteria show binary fission
- Parent cell and newly formed cells are similar in size.
- Cytoplasm of parent cell divides equally.
- It is a natural process and can not be done artificially.
Budding
- It is the kind of asexual reproduction in which a parent cell forms an out- growth as a bud and this but detaches to form a new individual multicellular.
- Multicellular organisms like yeast reproduce using budding.
- Parent cell is larger than the newly formed bud.
- Cytoplasm divides unequally parent cell has more cytoplasm than bud.
- It is a type of vegetative propagation and can be done artificially.
APPEARS IN
संबंधित प्रश्न
Name the following : Thread like non-reproductive structures present in Rhizopus.
List two advantages of vegetative propagation.
List four modes of asexual reproduction.
Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?
which can be grown from their leaves.
What is the name of asexual reproduction method in Spirogyra
Name the natural method by which strawberry plants are propagated.
Name any two plants which are propagated by cuttings method.
Explain why, more complex multicellular organisms cannot give rise to new organisms through regeneration.
The yeast cells fail to multiply in water but they multiply rapidly in sugar solution. Give one reason for it.
What is a tuber? Name one stem tuber and one root tuber.
Name two organisms which reproduce by the same asexual process as that of Amoeba.
Name one organism which reproduces by fission and another which reproduces by fragmentation.
Name one unicellular organism which reproduces by the same asexual process as Hydra.
State two advantages of grafting method of artificial propagation of plants.
The micro-organism which reproduces by multiple fission is the one which causes the disease known as :
(a) Kala-azar
(b) marasmus
(c) malaria
(d) amoebiasis
Binary fission describes the type of reproduction where the organism divides to form :
(a) many spores
(b) two daughters
(c) many buds
(d) two hyphae
The cut part of a plant stem (without roots) which is used in grafting is called :
(a) stock
(b) stump
(c) scion
(d) graft
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 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.
State whether the following statement IS true (T) or false (F):
Asexual reproduction is more common than the sexual reproduction.
Mention the common method of reproduction in Yeast.
Mention the common method of reproduction in Dahlia.
Mention the common method of reproduction in Mango.
What happens when a mature spirogyra filament attains considerable length?
Name the following :
Explain the structure and the function of the structures released from the ‘blobs’ in Rhizopus.
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.
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
Name four plants which can be propagated by root-cutting
How is vegetative propagation economically important?
Asexual reproduction in yeast is ______.
Asexual reproduction takes place through budding in ______.
Which of the following methods of asexual reproduction are observed in lower organisms?
Many unicellular organisms reproduce by the process of ______
Vegetative propagation refers to formation of new plants from
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 do the following parts of a flower develop into after fertilisation?
| a. | Ovary | ______ |
| b. | Ovules | ______ |
Name the asexual reproductive structure of Chlamydomonas.
The part of a seed which is a source of food during germination of seed is ______.
