Biology:2004:CBSE: [All India ]:Set-II
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Q1
What are the starting points of a grazing food chain and a detritus food chain respectively? Marks:1View AnswerAnswer:
The starting point in grazing food chain is grass and in the detritus food chain is dead organic matter.
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Q2
A cardiologist observed an enlarged QR wave in the ECG of a patient. What does it indicate? Marks:1View AnswerAnswer:
An enlarged QR wave in the ECG of a patient indicates ventricular hypertrophy.
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Q3
Name the type of cells that produce antibodies. Marks:1View AnswerAnswer:
B cells
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Q4
Name the cavity in the girdle, into which the head of the femur fits. Marks:1View AnswerAnswer:
Acetabulum is the cavity in the pelvic girdle into which the head of femur fits in.
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Q5
Newt regenerates its amputed limb. What type of regeneration is it? Marks:1View AnswerAnswer:
Epimorphosis.
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Q6
What is meant by Respiration Quotient (RQ)? When will the value of RQ be 1 and when will it be less than 1. Marks:2View AnswerAnswer:
Out of syllabus
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Q7
Explain any two functions of cerebrospinal fluid in humans. Marks:2View AnswerAnswer:
Out of syllabus
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Q8
Name the respective mineral nutrient element that
(i) form the core constituent of the ring structure of chlorophyll
(ii) activates carboxylases
(iii) forms the component of nitrogenase
(iv) synthesises middle lamella of plant cells.Marks:2View AnswerAnswer:
Out of syllabus
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Q9
What is photochemical smog composed of? How does it affect the plants? Marks:2View AnswerAnswer:
It is made up of particulates, nitrogen oxides, ozone,
and unreacted hydrocarbons and PAN etc. Chemicals such as nitrogen oxides, ozone and peroxyacetyl nitrate (PAN) can have harmful effects on plants. These substances can reduce or even stop growth in plants by reducing photosynthesis. Ozone, even in small quantities, can help to achieve this, but PAN is more toxic to plants than ozone. -
Q10
Define a portal vein. Explain the functions of such a vein in our digestive system. Marks:2View AnswerAnswer:
Out of syllabus
