Please select a subject first
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What are Sexually Transitted Diseases (STD)? List two viral and two bacterial STDs.
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What is contraception ? List three reasons for adopting contraceptive methods.
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What is contraception? List four different methods. State four reasons for adopting contraceptive methods.
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The period of pregnancy is called ______
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Which of the following method of contraception protects from acquiring sexually transmitted diseases?
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There is a greater possibility for the evolution of a new species in organisms which reproduce by ______
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Explain how, offspring and parents of organisms reproducing sexually have the same number of chromosomes?
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Colonies of yeast fail to multiply in water, but multiply in sugar solution. Give one reason for this.
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Why does bread mould grow profusely on a moist slice of bread rather than on a dry slice of bread?
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Would a Planaria cut vertically into two halves regenerate into two individuals? Complete Figure D and E by indicating the regenerated regions.
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| A | B | C | D | E |
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From the internet, gather information about the chromosome numbers of five animals and five plants. Correlate the number with the size of organism and answer the following questions.
- Do larger organisms have more number of chromosomes/cells?
- Can organism with fewer chromosomes reproduce more easily than organisms with more number of chromosomes?
- More the number of chromosomes/cells greater is the DNA content. Justify.
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In tobacco plant, the male gametes have twenty four chromosomes.
What is the number of chromosomes in the female gamete?
What is the number of chromosomes in the zygote?
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Reproduction is linked to stability of population of a species. Justify the statement.
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How are general growth and sexual maturation different from each other?
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Trace the path of sperm during ejaculation and mention the gland and their functions associated with the male reproductive system.
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What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg?
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Our government has legalised the age for marriage in boys and girls. Give reasons as to why one should get married after a certain age.
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State one drawback of the following:
Oral contraceptive pills
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State one drawback of the following:
Copper - T
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Under which category of contraceptive methods, is the use of condom kept? In what way, its use is better as compared to other methods of contraception?
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