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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.
Draw a diagram of DNA showing genes.
Find the odd one out:
Amoeba, Euglena, Planaria, Paramoecium
Which life process ensures that a plant or animal species will not disappear from this earth?
What is the name of the reproductive process :
which involves only one parent?
Name two animals which reproduce asexually.
What is the basic difference between asexual reproduction and sexual reproduction?
Which of the following organisms reproduce by sexual method and which by asexual method?
Amoeba, Cats, Humans, Hydra, Birds
What is the importance of DNA copying in reproduction? Explain with an example.
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
In the list of organisms given below, those which reproduce by the asexual method are :
(i) banana
(ii) yak
(iii) yeast
(iv) Amoeba
(a) (ii) and (iv)
(b) (i), (iii) and (iv)
(c) (i) and (iv)
(d) (ii), (iii) and (iv)
The offsprings formed by asexual reproduction method have greater similarity among themselves because :
(i) asexual reproduction involves only one parent
(ii) asexual reproduction involves two parents
(iii) asexual reproduction involves gametes
(iv) asexual reproduction does not involve gametes
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iv)
(d) (i) and (iv)The offsprings formed by asexual reproduction method have greater similarity among themselves because :
(i) asexual reproduction involves only one parent
(ii) asexual reproduction involves two parents
(iii) asexual reproduction involves gametes
(iv) asexual reproduction does not involve gametes
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iv)
(d) (i) and (iv)
The method of asexual reproduction in plants in which callus is produced is :
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.
Imagine all the seeds produced by a plant happen to fall under the same plant and sprout into new plants. Mention any two problems that will be faced by the new plants.
Find the odd-one out, giving reason.
Gamete, budding, fragmentation, regeneration.
Why is reproduction necessary for living organisms?
Write the full form of DNA.
Name the factors which take part in this process.
Multiple choice question.
In ovule, meiosis occurs in ______
Which of the following types require pollinator but the result is genetically similar to autogamy?
Multiple choice question.
Point out the odd one.
The number of meiotic and mitotic divisions necessary for development of female gametophyte in angiosperms is ______.
What is hilum with respect to ovule?
Draw a well labelled diagram of T.S. anther.
What is morula?
What are the causes for the extinction of animals?
Reproductive part of a plant is ______.
Planaria reproduces asexually by ______.
Match the following.
| Column I | Column II |
| Fission | Spirogyra |
| Budding | Amoeba |
| Fragmentation | Yeast |
In a flower, the parts that produce male and female gametes (germ cells) are
In the list of animals given below, hen is the odd one out.
| human being | cow | dog | hen |
The reason for this is
Which of the following statements about reproduction in humans is correct?
The term metamorphosis is not used while describing human development. Why?
Give reason for the following:
All multicellular organisms cannot give rise to new individuals through fragmentation or regeneration.
