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प्रश्न
Colonies of yeast fail to multiply in water, but multiply in sugar solution. Give one reason for this.
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उत्तर
An organism requires energy to perform various life processes such as nutrition, respiration, etc. so as to sustain its life and also to reproduce. Since water lacks source of energy, colonies of yeast fail to multiply in it whereas sugar solution provides source of energy, colonies of yeast multiply in it.
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संबंधित प्रश्न
Do you think that reproductive health in our country has improved in the past 50 years? If yes, mention some such areas of improvement.
What is the causative organism for the following disease?
Syphilis
Name the contraceptive device used by human females which is put over the cervix.
Name two devices used in the barrier method of birth control.
What is done in the contraception method known as tubectomy?
Give two examples of sexually transmitted diseases.
How does copper-T prevent pregnancy?
What is the name of surgical method of birth control (or preventing pregnancy) which is carried out in women?
People who die from AIDS are not killed by the virus itself. Explain.
A woman uses pills A as a method of birth control (or preventing pregnancy). The pills A stop the ovaries from releasing ovum into oviducts. Another woman uses pills B as a method of birth control. The pills B kill the sperms and prevent pregnancy.
(a) What do the pills A contain?
(b) What is the common name of pills A?
(c) What do the pills B contain?
(d) What is the common name of pills B?
(e) What is the general name of these methods of birth control?
Name the kind of diseases/disorders and any two symptoms that are likely to occur in humans if The karyotype is XXY
Write any two Sexually transmitted diseases.
Why is it necessary to maintain reproductive health? Which precautions one should follow to maintain reproductive health?
Surgical methods of contraception prevent gamete formation.
Which one amongst the following is the first country in the world to initiate action plans and programmes at a national level to attain total reproductive health as social goal?
Why does bread mould grow profusely on a moist slice of bread rather than on a dry slice of bread?
What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg?
Given below are events that lead to pregnancy and development of embryo.
- Fertilization of egg
- Maturation of egg
- Release of egg
- Embedding of embryo in thickened uterine wall.
Which of the following options gives the correct order of sequence in which they occur?
Observe the chart and graph given in the figure carefully and answer the following questions.
| Age in Years |
% of full height | |
| Boys | Girls | |
| 8 | 72% | 77% |
| 9 | 75% | 81% |
| 10 | 78% | 84% |
| 11 | 81% | 88% |
| 12 | 84% | 91% |
| 13 | 88% | 95% |
| 14 | 92% | 98% |
| 15 | 95% | 99% |
| 16 | 98% | 99.5% |
| 17 | 99% | 100% |
| 18 | 100% | 100% |
- Which of the line represents the height of boys?
- Which line represents the height of girls?
- What is the difference between the pattern of increase in the height of boys and girls?
- Is this pattern true for each individual?
Where was "Saheli" developed?
