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प्रश्न
Draw a diagram of DNA showing genes.
उत्तर
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संबंधित प्रश्न
What is DNA?
Where is DNA found in a cell ?
State the importance of DNA copying.
Explain the importance of reproduction in organisms.
A spore-producing organism is ______.
Which type of reproduction :
does not involve gametes?
Match the organisms given in column I with the methods of reproduction/propagation given in column II :
| Column I | Column II | |
| (i) Plasmodium | (a) Spore formation | |
| (ii) Spirogyra | (b) Leaves | |
| (iii) Jasmine | (c) Regeneration | |
| (iv) Apple tree | (d) Budding | |
| (v) Bryophyllum | (e) Binary fission | |
| (vi) Potatoes | (f) Layering | |
| (vii) Rhizopus | (g) Fragmentation | |
| (viii) Hydra | (h) Tubers | |
| (ix) Planaria | (i) Cuttings | |
| (x) Leishmania | (j) Multiple fission | |
| (xi) Sugar cane | (k) Grafting | |
| (xii) Rose |
What are the two general methods of reproduction in organisms?
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 internal fertilisation?
The characteristics transmitted from parents to offspring are present in :
(a) cytoplasm
(b) ribosome
(c) golgi bodies
(d) genes
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.
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.
Insect pollinated flowers usually posses ______
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?
The number of meiotic and mitotic divisions necessary for development of female gametophyte in angiosperms is ______.
Self-incompatibility is found in flowers of plants _______.
Draw a well labelled diagram of the monocot seed you have studied.
What is the use of tablet ‘Saheli’?
Reproductive part of a plant is ______.
The plant which propagates with the help of its leaves is ______.
Planaria reproduces asexually by ______.
Why is vegetative propagation practiced for growing some type of plant?
Explain the term reproduction.
Assertion and Reason types of Question.
Assertion: In potatoes, shoot arises from eyes.
Reason: Eyes represent the buds.
Assertion and Reason types of Question.
Assertion: In Banyan prop roots grow horizontally from the tree.
Reason: They give additional support to the tree.
Assertion and Reason types of Question.
Assertion: Corm is a condensed form of Bulb.
Reason: It has dry and fleshy scale leaves.
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 nucleus is unlike other nuclei in the female gametophyte of angiosperms?
