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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
…………. is a mode of asexual reproduction.
(a) Cloning
(b) Budding
(c) Pollination
(d) Germination
A student is observing a permanent slide showing sequentially the different stages of asexual reproduction taking place in yeast. Name this process and draw diagrams, of what he observes, in a proper sequence.
Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?
How does Plasmodium reproduce. Is this method sexual or asexual?
Draw in sequence (showing the four stages), the process of binary fission in Amoeba.
Name the process by which an Amoeba reproduces. Draw the various stages of its reproduction in a proper sequence.
Fill in the following blank with suitable word :
Rose plants and sugar cane crop are usually grown by the ........... method.
Describe the process of reproduction in Hydra with the help of labelled diagrams. What is the name of this process of reproduction?
Name two marine organisms which also reproduce by the same method as yeast but form colonies.
Describe the grafting method for the artificial propagation of plants with the help of labelled diagrams.
The cut part of a plant stem (without roots) which is used in grafting is called :
(a) stock
(b) stump
(c) scion
(d) graft
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 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.
What is vegetative reproduction?
Fill in the blank:
Yeast cells reproduce by ________.
Define the following:
Binary fission
Mention the common method of reproduction in Mosses.
Describe the advantages of vegetative reproduction.
Describe the various methods of vegetative reproduction.
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
Explain the term Vegetative propagation.
Why is chemical communication better than electrical impulses as a means of communication between cells in a multi-cellular organism?
Write four lines on the following: Budding
Give the name of the plant that reproduces vegetatively by: Stem-cutting
How is plant hybridisation as a technique beneficial?
What is micropropagation?
This method of asexual reproduction is seen in paramoecium.
Name the three types of asexual reproduction in unicellular organisms.
- Which type of reproduction is indicated in the following diagram?
- Redraw the given type of reproduction in the correct sequence and explain it.
Seeds are the product of asexual reproduction.
Many unicellular organisms reproduce by the process of ______
Characters that are transmitted from parents to offspring during reproduction show
In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called
Can you consider cell division as a type of reproduction in unicellular organism? Give one reason.
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?
Mustard was growing in two fields- A and B. While Field A produced brown coloured seeds, field B produced yellow coloured seeds.
It was observed that in field A, the offsprings showed only the parental trait for consecutive generations, whereas in field B, majority of the offsprings showed a variation in the progeny.
What are the probable reasons for these?
