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प्रश्न
Draw a diagram of DNA showing genes.
उत्तर
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संबंधित प्रश्न
Name the scientist who put forward the most popular model of DNA.
Define reproduction.
What is DNA?
Why is DNA copying an essential part of the process of reproduction?
Which type of reproduction :
does not involve gametes?
Name two animals which reproduce asexually.
Fill in the following blank with suitable word :
the process of...........ensures continuity of life on earth.
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)
In asexual reproduction, two offsprings having the same genetic material and the same body features are called :
(a) callus
(b) twins
(c) clones
(d) chromosomes
What type of fertilisation takes place in birds?
State whether the following statement is true (T) or false (F):
Producing life is called respiration.
State whether the following statement is true (T) or false (F):
Most organisms have the capacity of regeneration in some or the other way.
Why is reproduction necessary for living organisms?
Write the full form of DNA.
Name the part of the cell where DNA is located?
Give reason for the following:
Vegetative propagation is practised for growing only some type of plants.
The daughter cells produced by asexual reproduction are genetically identical to the parent cell.
Explain the term Reproduction.
By which process do green plants synthesize their food?
Answer the following question.
The growing size of the human population is a cause of concern for all people. The rate of birth and death in a given population will determine its size. Reproduction is the process by which organisms increase their population. The process of sexual maturation for reproduction is gradual and takes place while general body growth is still going on. Some degree of sexual maturation does not necessarily mean that the mind or body is ready for sexual acts or for having and bringing up children. Various contraceptive devices are being used by human beings to control the size of the population.
(a) List two common signs of sexual maturation in boys and girls.
(b) What is the result of reckless female foeticide?
(c) Which contraceptive method changes the hormonal balance of the body?
(d) Write two factors that determine the size of a population.
Multiple choice question.
The ploidy level is not the same in ______.
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 ______.
In vitro pollen germination and pollen tube elongation can be induced by ______.
Seminal fluid is ______ in nature.
What are the causes for the extinction of animals?
Write two types of reproduction in plants.
Why is vegetative propagation practiced for growing some type of plant?
Explain the term reproduction.
Assertion and Reason types of Question.
Assertion: Corm is a condensed form of Bulb.
Reason: It has dry and fleshy scale leaves.
Which of the following statements about reproduction in humans is correct?
The term metamorphosis is not used while describing human development. Why?
How is reproduction in Hydra different from that in Amoeba?
