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Which of the below mentioned regions exhibit lees seasonal variations?
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What is the role of cervix in the human female reproductive system?
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Female reproductive organs and associated functions are given below in column A and B. Fill the blank boxes.
| Column A | Column B |
| Ovaries | Ovulation |
| Oviduct | a |
| b | Pregnancy |
| Vagina | Birth |
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Draw a neat diagram of the female reproductive system and label the parts associated with the following:
(a) production of gamete
(b) site of fertilisation
(c) site of implantation
(d) birth canal
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With a suitable diagram, describe the organisation of mammary gland.
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The present population growth rate in India is alarming. Suggest ways to check it.
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What is the significance of progesterone-estrogen combination as a contraceptive measure?
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Mention two advantages of lactational amenorrhea as a contraceptive method.
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Copper ions-releasing IUDs are more efficient than non-medicated methods. Why?
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What are the advantages of natural methods of contraception over artificial methods?
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Comment on the essential features required for an ideal contraceptive.
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All reproductive tract infections RTIs are STDs, but all STDs are not RTIs. Justify with example.
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Discuss the mode of action and advantages/disadvantages of hormonal contraceptives.
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What is the function of histones in DNA packaging?
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Distinguish between heterochromatin and euchromatin. Which of the two is transcriptionally active?
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In an experiment, DNA is treated with a compound which tends to place itself amongst the stacks of nitrogenous base pairs. As a result of which, the distance between two consecutive base increases, from 0.34nm to 0.44 nm. Calculate the length of DNA double helix (which has 2 × 109 bp) in the presence of saturating amount of this compound.
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What would happen if histones were to be mutated and made rich in acidic amino acids such as aspartic acid and glutamic acid in place of basic amino acids such as lysine and arginine?
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The scientists believe that evolution is gradual. But extinction, part of evolutionary story, are 'sudden' and 'abrupt' and also group-specific. Comment whether a natural disaster can be the cause for extinction of species.
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When we say "survival of the fittest", does it mean that
- Those which are fit only survive, or
- Those that survive are called fit
Comment.
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Match the following list of bacteria and their commercially important products:
| Bacterium | Product |
| A. Aspergillus niger | i. Lactic acid |
| B. Acetobacter aceti | ii. Butyric acid |
| C. Clostridium butylicum | iii. Acetic acid |
| D. Lactobacillus | iv. Citric acid |
Choose the correct match:
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