Regeneration and Fragmentation

Q.

A Planaria worm is cut horizontally in the middle into two halves P and Q such that the part P contains the whole head of the worm. Another Planaria worm is cut vertically into two halves R and S in such a way that both the cut pieces R and S contain half head each. Which of the cut pieces of the two Planaria worms could regenerate to form the complete respective worms?
(a) only P
(b) only R and S
(c) P, R and S
(d) P, Q, R and S

Q.

What is fission? Explain with example.

Q.

What are fragmentation and regeneration?

Q.

Difference between binary fission and budding.

Q.

Offsets are produced by:

1. Parthenocarpy.

2. Meiotic divisions.

3. Parthenogenesis.

4. Mitotic division.

Q.

What is regeneration? Give an example of an organism which reproduces by this method.

Q.

Why can't humans beings use regeneration for reproduction?

Q.

In Spirogyra, asexual reproduction takes place by :
(a) division of a cell into two cells.
(b) breaking up of filaments into smaller bits.
(c) division of a cell into many cells.
(d) formation of a large number of buds.

Q.

An organism which can reproduce by two asexual reproduction methods one similar to the reproduction in yeast and the other similar to the reproduction in Planaria is :
(a) Spirogyra
(b) Bryophyllum
(c) Hydra
(d) Sea anemone

Q.

In Spirogyra, asexual reproduction, takes place by ___.

Q.

What is the name of asexual reproduction method in :
(i) Spirogyra, and (ii) Leishmania ?

Q. Which of the following organisms grows into a complete individual from each piece when cut into a number of pieces?

1. Euglena
2. Planaria
3. Rhizopus
4. Yeast

Q. What happens when a mature spirogyra filament attains considerable length ?

Q.

Question 8
In Spirogyra, asexual reproduction takes place by

(a) breaking up of filaments into smaller bits
(b) division of a cell into two cells
(c) division of a cell into many cells
(d) formation of young cells from older cells

Q.

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.

Q.

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

Q.

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

Q.

(a) What is meant by regeneration ? Name two animals which can regenerate fully from their cut body parts.
(b) Explain why, more complex multicellular organisms cannot give rise to new organisms through regeneration.

Q.

A worm X found in freshwater and slow-moving streams has been accidentally cut into three pieces. It was observed that in due course of time, each cut piece of the worm develops to become a complete worm by growing all the missing parts.
(a) Name the worm X which can exhibit this phenomenon of making a complete worm from its cut body parts.
(b) Name another organism Y that possesses the same characteristic of growing fully from its cut body parts.
(c) What is the name of this process in which a complete organism is formed from its cut body part?
(d) State whether X and Y are unicellular and/or multicellular organisms.
(e) Can a dog be produced completely from its cut body part (say, a cut tail) just like organisms X and Y? Why?

Q. The above given figure depicts

1. Budding in yeast
2. Binary fission in Mucor
3. Regeneration in Monocystis
4. Fragmentation in Spirogyra

Q.

A fish unlike a spirogyra cannot reproduce through fragmentation process. The possible reason for inability of fish is …………………………………

1. Complexity in body design

2. Special cells are involved in reproduction

3. Cells and tissues are well differentiated

4. All of the above

Q.

Is Cnidaria unicellular or multicellular?

Q. Statement 1: In asexual reproduction, only one parent is required to produce a new offspring.

Statement 2: Planaria can be cut into any number of pieces and each piece grows into a complete organism.

1. Only statement 1 is correct
2. Only statement 2 is correct
3. Both the statements are correct
4. Both the statements are incorrect

Q. How many of the following organisms undergo the process of regeneration?
Rhizopus, Yeast, Hydra, Amoeba, Planaria

1. Three
2. Four
3. Two
4. Five

Q. In , broken parts of an organism develop to form a new individual.

1. Budding
2. Fission
3. Fragmentation
4. Spore formation

Q.

One of the following organisms does not reproduce by fission. That is :
(a) Amoeba
(b) Leishmania
(c) Planaria
(d) Plasmodium

Q.

An alga which reproduction by the asexual method called fragmentation is :
(a) Rhizopus
(b) Salmonella
(c) Plasmodium
(d) Spirogyra

Q. All of the following may be the means of propagating those plants which do not produce viable seeds, except

1. Grafting
2. Layering
3. Cutting
4. Gamete fusion

Q.

Fragmentation is common in:

1. Rose

2. Spirogyra

3. Planaria

4. Hydra

Q. Q. Why can't human adapt different type of reproduction like regeneration or any other type of reproduction.