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Question
Fill in the blanks and rewrite the completed statements:
___________ acid inhibits growth leading to wilting of leaves.
Solution
Abscissic acid inhibits growth leading to wilting of leaves.
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RELATED QUESTIONS
A student has to focus his compound microscope to observe a prepared slide showing different stages of binary fission in Amoeba. The steps he is likely to follow are listed below in a haphazard manner:
I. Adjust the diaphragm and the mirror of the microscope so that sufficient light may enter to illuminate the slide.
II. Fix the slide on the stage carefully.
III. Adjust the microscope to high power and focus.
IV. Adjust the microscope to low power and focus.
The correct sequence of the above steps to observe the slide under the microscope is
(A) I, II, IV, III
(B) II, I, IV, III
(C) II, IV, I, III
(D) I, IV, II, III
List any two modes of asexual reproduction in animals.Under which mode of reproduction is vegetative propagation placed and why?
On cutting the body of an organism into many pieces it was observed that many of these pieces developed as new individuals. Name the process and list two organisms in which this process may be observed. Draw a schematic diagram to illustrate the changes that are likely to be observed during the development of new individuals in any one of the organisms named.
Most of the plants reproduce by sexual method. Name two plants which can reproduce asexually.
Name one organism which reproduces by spore formation
Name the asexual method of reproduction in yeast.
Name two plants which are propagated by layering method.
Fill in the following blanks with suitable words :
Plasmodium reproduces by the process of ............ fission whereas Paramecium reproduces by the process of ......... fission.
Explain vegetative propagation with the help of two examples. List two advantages of vegetative propagation.
Describe the layering method for the artificial propagation of plants. Illustrate your answer with the help of a labelled diagram. Name any five plants which are propagated by the layering method.
Name a tiny fresh-water animal which reproduces by the same method as that of yeast? What is this method known as?
What is meant by 'grafting' as a means of propagation in plants?
What is the difference between the cuttings method and grafting method for the artificial propagation of plants?
State whether the following statement is true (T) or false (F):
Bacteria and yeast reproduce by sexual reproduction.
Mention the common method of reproduction in Ferns.
Mention the common method of reproduction in Ginger.
Mention the common method of reproduction in Rose.
Name the method by which hydra reproduces. Is this method sexual or asexual?
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.
A student after observing a slide showing different stages of binary fission in Amoeba draws the following diagrams. However these diagrams are not in proper sequence:
The correct sequence is:
(A) I, V, IV, III, II
(B) I, III, IV, V, II
(C) I, V, III, IV, II
(D) I, IV, V, III, II
Name the following :
Explain the structure and the function of the structures released from the ‘blobs’ in Rhizopus.
What is regeneration in organism?
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. | ____________ |
Explain the term Vegetative propagation.
Rewrite the following statement by selecting the correct option.
When Hydra becomes matured, _________ takes place in it.
Draw a labelled diagram in proper sequence to show budding in hydra.
Give the name of the plant that reproduces vegetatively by: Grafting
What do you understand by hybridisation?
What is micropropagation?
What is protandry?
Name any one plant in which double fertilization was discovered?
Distinguish between sexual and asexual reproduction.
Asexual reproduction takes place through budding in ______.
Budding, in hydra, is a form of ______.
Hydra usually reproduces by ______
Offspring formed by asexual method of reproduction have greater similarity among themselves because
- asexual reproduction involves only one parent
- asexual reproduction does not involve gametes
- asexual reproduction occurs before sexual reproduction
- asexual reproduction occurs after sexual reproduction
In Figure, the parts A, B and C are sequentially
In the diagram given in Figure 12.2 label the parts marked (a), (b) and (c).
Match the columns:
| Column A (Asexual) | Column B (Examples) | ||
| (a) | Spore formation | (1) | Spirogyra |
| (b) | Conidia formation | (2) | Yeast |
| (c) | Fragmentation | (3) | Chlamydomonas |
| (d) | Budding | (4) | Penicillium |
