Advertisements
Advertisements
Question
- Which type of reproduction is indicated in the following diagram?
- Redraw the given type of reproduction in the correct sequence and explain it.
Solution
- The type of reproduction indicated in the given diagram is multiple fission.
Multiple fission in Amoeba
i. Whenever there is a lack of food or any other type of adverse condition, Amoeba and other similar protists become rounded and form a protective covering around plasma membrane called as ‘cyst’.
ii. Repeated nuclear divisions in the cyst result in the formation of many nuclei.
iii. This is followed by cytoplasmic division and as a result, many encysted amoebulae are formed.
iv. Under favourable conditions, cyst breaks open and many amoebulae are released.
APPEARS IN
RELATED QUESTIONS
Differentiate between 'stem tuber' and 'tuberous root'.
Label the parts (1) and (2) in budding of yeast cell.
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.
What happens when a Planaria gets cut into two pieces?
Fertilisation is necessary even in asexual reproduction.
Define asexual reproduction.
What is vegetative propagation?
Describe reproduction by spores in Rhizopus
Name the process by which an Amoeba reproduces. Draw the various stages of its reproduction in a proper sequence.
Name one commonly used vegetable which is propagated by using tubers.
Vegetative propagation involves the growth and development of 'something' present in the old part of the plant to form a new plant. What is this 'something'?
How can you grow money plant by vegetative propagation?
How does an Amoeba reproduce? Describe the process of reproduction in Amoeba with the help of labelled diagrams of different stages in its reproduction process.
Describe the process of reproduction in Hydra with the help of labelled diagrams. What is the name of this process of reproduction?
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
Vegetative propagation refers to the formation of new plants from the following existing organs of the old plants :
(a) stems, roots and flowers
(b) stems, roots and leaves
(c) stems, flowers and fruits
(d) stems, leaves and flowers
APlanaria 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 twoPlanaria 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
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?
Fill in the blank:
Binary fission produces cells of ________ size.
State whether the following statement is true (T) or false (F):
A potato tuber is really an underground stem.
Differentiate between the following:
Binary fission and budding
Define the following:
Binary fission
What is vegetative propagation? List with brief explanation three advantages of practising this process for growing some types of plants. Select two plants from the following which are grown by this process:
Banana, Wheat, Mustard, Jasmine, Gram.
After observing the prepared slides of binary fission in Amoeba and budding in yeast following observations were reported:
(a) Single cells of Amoeba and yeast were undergoing binary fission and budding respectively.
(B) Cytokinesis was observed in the yeast cell.
(C) Elongated nucleus was dividing to form two daughter nuclei in Amoeba.
(D) A chain of buds were observed due to reproduction in Amoeba.
The correct observation(s) is/are:
(A) a and c
(B) b only
(C) c and d
(D) d, a and c
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. | ____________ |
Gemmule formation takes place in ________.
In hydra the type of reproduction is ___________.
Write four lines on the following: Grafting
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?
Name any one plant in which double fertilization was discovered?
Write a note on different types of endosperms in angiosperms.
What determines whether the two organisms of a species will be exactly similar or not?
Identify the type of reproduction from the following explanation and draw a neat and labelled diagram.
- The body of the parent organism breaks up into many fragments and each fragment starts to live as an independent new organism.
- Give two examples of living organisms which follow this type of reproduction method.
The ability of a cell to divide into several cells during reproduction in Plasmodium is called ______
Pick the odd one out from the following on the basis of the mode of reproduction and give a reason for it.
Sugarcane, Potato, Rice, Rose
In the diagram given in Figure 12.2 label the parts marked (a), (b) and (c).
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”.
