Biology:2005:CBSE:[All India ]:Set-III
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Q1
Name the heaviest and longest bone in the human body. Marks:1View AnswerAnswer:
Femur is the heaviest and the longest bone in the human body.
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Q2
List two factors that determine the vegetation and soil type of an ecosystem. Marks:1View AnswerAnswer:
Temperature and precipitation. -
Q3
Which type of UV radiations can be lethal to organisms? Marks:1View AnswerAnswer:
UV-B is the most harmful type of ultra-violet ray for organisms. -
Q4
What causes Gouty Arthritis in humans? Marks:1View AnswerAnswer:
Inflammation of joints due to accumulation of uric acid crystals on the cartilage of joint articulation, tendons and surrounding tissue is known as gouty arthritis.
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Q5
Why is gene encoding for “Cry” protein inserted into a crop plant? Marks:1View AnswerAnswer:
To make it insect- resistant. -
Q6
Which animals suffer from Rinderpest? Give its two early symptoms and explain how it spreads. Marks:2View AnswerAnswer:
Out of syllabus -
Q7
Explain symbiotic nitrogen fixation in leguminous plants. Marks:2View AnswerAnswer:
Out of syllabus -
Q8
List any four objectives of the Wild-life (Protection) Act, 1972, amended in 1991. Marks:2View AnswerAnswer:
Objectives of wildlife (Protection) Act, 1972, amended in 1991: 1) Prohibition and restriction on hunting of animals. 2) Protection of special plants. 3) Setting up and managing Sanctuaries and National parks. 4) Control of trade and commerce in wildlife, wildlife products and trophies. -
Q9
An Rh-negative mother has safely delivered her first Rh-positive child. Discuss the problems that can arise as a result of it and can affect a subsequent pregnancy. Marks:2View AnswerAnswer:
Rh sensitization usually doesn't hurt the baby in the first pregnancy, because the mom can't make enough antibodies to cause severe problems. But the next pregnancy can become very complicated if that foetus is Rh positive,the anti-Rh-antibodies enter the foetal blood and starts destroying the RBCs of the foetus.
This results in erytroblastosis foetalis of the child.Brain can also be affected by bilirubin.
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Q10
Why do temperate regions show a lower value of primary productivity as compared to tropical regions? Give two reasons. Marks:2View AnswerAnswer:
Tropical regions show higher value of primary productivity for many reasons eg. they mostly every day get sufficient rain fall and sunlight which is very suitable for plant growth and support biodiversity. On the other hand the seasonal fluctuations in temperature and rainfall are not conducive for a higher productivity in the temperate regions.
