Biology:2008:CBSE:[Delhi ]:Set-II
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Q1
What causes speciation according to Hugo de Vries?
Marks:1View AnswerAnswer:
Mutation
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Q2
List any two economically important products for humans obtained from Apis indica.
Marks:1View AnswerAnswer:
a. Honey,
b. Beeswax. -
Q3
Name the Indian variety of rice patented by an American company.
Marks:1View AnswerAnswer:
Basmati.
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Q4
Name the world’s most problematic aquatic weed. What is the nature of the water body in which the weeds grow abundantly?
Marks:1View AnswerAnswer:
Water hyacinth (Eicchornia).It grows in standing water.
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Q5
Which one of the two,steno thermals or eurythermals,show wide range of distribution on earth and why?
Marks:1View AnswerAnswer:
Eurythermals show wide range of distribution on earth as they can tolerate wide range of temperature variation.
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Q6
Recently Chikungunya cases were reported from various parts of the country.Name the vector responsible.
Marks:1View AnswerAnswer:
Aedes aegypti (a mosquito) is the major vector of Chikungunya virus.
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Q7
Name the technique used for separating DNA fragments in the laboratory.
Marks:1View AnswerAnswer:
Gel Electrophoresis.
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Q8
Name the components 'a' and 'b' in the nucleotide with a purine,given below:
Marks:1View AnswerAnswer:
a-- is sugar
b-- is nitrogen base -
Q9
The flower of brinjal is referred to as chasmogamous while that of beans is cleistogamous. How are they different from each others?
Marks:2View AnswerAnswer:
Chasmogamous flowers have exposed anthers and stigma while cleistogamous flowers do not open at all.
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Q10
A man with blood groups A married a woman with B group. They have a son with AB blood group and a daughter with blood group O. Work out the cross and show the possibility of such inheritance.
Marks:2View AnswerAnswer:
The possibility of such inheritance is 25% in each case.
