Biology:2008:CBSE: [All India ]:Set-II
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Q1
Name any two vertebrate body parts that are homologous to human forelimbs.
Marks:1View AnswerAnswer:
Seal’s front flipper and bat’s wings.
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Q2
What is the economic value of Spirulina?
Marks:1View AnswerAnswer:
Spirulina serves as food rich in protein, mineral and vitamins.
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Q3
What was the specialty of the milk produce by the transgenic cow Rosie?
Marks:1View AnswerAnswer:
Transgenic cow Rosie produces milk containing human proteins, (lactalbumen) which may help in the treatment of human emphysema.
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Q4
Mention the polarity of the DNA strand a-b and c-d shown in the replicating forks given below
Marks:1View AnswerAnswer:
a-b has 3’-->5’ and c-d has 5’-->3’.
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Q5
Mention any two significant roles predation plays in nature.
Marks:1View AnswerAnswer:
(i) Predation keeps check on the prey population.
(ii) Predators act as conduits for energy transfers across trophic levels . -
Q6
Between amphibians and birds, which will be able to cope with global warming? Give reason.
Marks:1View AnswerAnswer:
Birds will be able to cope with global warming because they are able to tolerate the high temperature while amphibians cannot tolerate the fluctuation in temperature and go into hibernation.Moreover their complex life cycle involves both land and water stages.
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Q7
Name the two types of cells in which the HIV multiplies after gaining entry into the human body?
Marks:1View AnswerAnswer:
Macrophages and helper T-lymphocytes are the two types of cells in which the HIV multiplies after gaining entry into the human body.
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Q8
A multinational company outside India tried to sell new varieties of turmeric without proper patent rights. What is such an act referred to?
Marks:1View AnswerAnswer:
Biopiracy is the term used to refer to the use of bio-resources by multinational companies and other organisations without proper authorisation from the countries and people concerned without compensatory payment.
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Q9
(a) Expand IUD.
(b) Why hormone releasing IUD considering a good contraceptive to space children?Marks:2View AnswerAnswer:
(a) IUD: Intra Uterine Devices.
(b) The hormone releasing IUDs, make the uterus unsuitable for implantation and the cervix hostile to the sperm. So IUD is a good contraceptive for females to space children. -
Q10
Why do sportspersons often fall victim to cocaine addiction.
Marks:2View AnswerAnswer:
Cocaine has a potent stimulating action on the central nervous system, producing a sense of euphoria and increase in energy. That is why sportspersons often fall a victim to cocaine addiction.
