Biology:2004:CBSE:[ All India ]:Set-III
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Q1
What is apoptosis with reference to ageing? Marks:1View AnswerAnswer:
Out of syllabus
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Q2
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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Q3
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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Q4
Both the thin and the thick segments of the ascending limb of Henle's loop transport NaCl out to the interstitial fluid. What is the difference in their respective mode of transport? Marks:1View AnswerAnswer:
The thin segment of the ascending limb of Henle's loop transport NaCl passively, whereas the thick segment of ascending limb of Henle's loop transport NaCl actively out to the interstitial fluid.
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Q5
What is meant by replacement level with reference to human population growth? Marks:1View AnswerAnswer:
The number of births that will replace a population at the same size, without reduction or rise, is called replacement level. -
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
Name the organism that causes Anthrax in cattle. Why does the infected animal die within 2 or 3 days? Marks:2View AnswerAnswer:
Bacillus anthracis. Respiratory infection initially starts with cold or flu-like symptoms for several days, followed by severe (and often fatal) respiratory collapse.This disease can rarely be treated, even if diagnosed in early stages of infection. -
Q8
Differentiate between quiescence and dormancy with reference to seed germination. Marks:2View AnswerAnswer:
Out of syllabus
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Q9
How is our gut lining protected from its own secretion of proteases? Marks:2View AnswerAnswer:
The gut lining has mucus cell covering which provides protection to the epitheial lining from its own secretion of proteases. Proteases are secreted in inactive form and posses no threat to the gut lining.
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Q10
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
