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प्रश्न
What do you mean by DNA?
उत्तर
DNA is an acronym for deoxyribonucleic acid. It is present in the chromosomes which are present in the nucleus of every cell.
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संबंधित प्रश्न
Name the scientist who put forward the most popular model of DNA.
Define reproduction.
Where is DNA found in a cell ?
How does the amount of DNA remain constant though each new generation is a combination of DNA copies of two individuals?
Why is variation beneficial to the species but not necessarily for the individual?
Which life process ensures that a plant or animal species will not disappear from this earth?
Write down the different methods of asexual reproduction.
What are the two general methods of reproduction in organisms?
What is the importance of DNA copying in reproduction? Explain with an example.
Why is variation during reproduction beneficial to the species but not necessarily for the individual?
Asexual reproduction is :
(a) a fusion of specialised cells
(b) a method by which all types of organisms reproduce
(c) a method producing genetically identical offspring
(d) a method in which more than one parent are involved
Name two animals which undergo external fertilisation.
Fill in the following blank with suitable word :
The union of a sperm nucleus with an egg nucleus is known as.......... and results in a .........egg.
What type of fertilisation takes place in fish?
State whether the following statement is true (T) or false (F):
Dogs and cats reproduce from two parents.
Find the odd-one out, giving reason.
Gamete, budding, fragmentation, regeneration.
Define the following:
Regeneration
Write the full form of DNA.
Name the part of the cell where DNA is located?
Explain the role of DNA in the process of reproduction of the cell.
Bryophyllum can reproduce by its ______.
Give reason for the following:
Vegetative propagation is practised for growing only some type of plants.
What do you mean by ‘Connecting Links’? Give one example.
If diploid chromosome number in a flowering plant is 12, then which one of the following will have 6 chromosomes?
Multiple choice question.
Presence of beard in boys is a _______.
The number of meiotic and mitotic divisions necessary for development of female gametophyte in angiosperms is ______.
Identify the odd one with respect to pollinating agent.
The single shield-shaped cotyledon in monocot seed is known as ______.
The example of dicot endospermic seed is ______.
What is hilum with respect to ovule?
Draw a well labelled diagram of T.S. anther.
What is the function of inner cell mass?
What is the use of tablet ‘Saheli’?
Assertion and Reason types of Question.
Assertion: In Banyan prop roots grow horizontally from the tree.
Reason: They give additional support to the tree.
In a flower, the parts that produce male and female gametes (germ cells) are
Observe the following figures.
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 |
 |
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| (a) | (b) | (c) | (d) |
- Identify the stages (a) to (d) in figure during development of human baby.
- Arrange the stages in correct sequence of development.
- Explain the development that takes place in any one stage.
Choose the correct meaning of reproduction.
