Biology:2007:CBSE: [ Delhi ]:Set-II
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Q1
What happens to the glycogen concentration in the liver cells when the level of adrenaline increases in the blood stream of humans? Marks:1View AnswerAnswer:
Out of syllabus -
Q2
What is the importance of the oesophageal sphincter in humans? Marks:1View AnswerAnswer:
The oesophageal sphincter is present at the junction of oesophagus and stomach. It regulates the opening of oesophagus into stomach. -
Q3
What is the importance of the epiglottis in human body? Marks:1View AnswerAnswer:
Epiglottis is a cartilaginous flap which prevents the entry of food in the glottis - the opening of wind pipe (trachea) during swallowing of food.
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Q4
What does ecological niche of an organism represent? Marks:1View AnswerAnswer:
The functional and positional status of an organism within an ecosystem is termed as ecological niche. -
Q5
It was diagnosed by a specialist that the immune system of the body of a patient has been suppressed. Name the disease the patient has been suffering from and its causative agent. Marks:1View AnswerAnswer:
AIDS.
HIV- III. -
Q6
What does S-shaped pattern of population growth represent? How is J-shaped pattern different from it and why? Marks:2View AnswerAnswer:
S-shaped growth is a pattern of growth in which, in a new environment, the population density of an organism increases slowly initially, in a positive acceleration phase; then increases rapidly approaching an exponential growth rate but then declines in a negative acceleration phase until at zero growth rate the population stabilizes. Then, the growth of the population fluctuates at the carrying capacity.
J- shaped growth curve show only lag and exponential phase. -
Q7
How do viruses enter plant body and spread to long distances within it? Mention any two ways by which viruses spread from one plant to another. Marks:2View AnswerAnswer:
Viruses can enter the plant through the diseased part or diseased plant (entire plant). The two ways are: - Virus can enter through secondary host and wild plants. - They can also enter through diseased seeds and through soil absorbed. -
Q8
Where are casparian strips located in a plant body and what are they made up of? Mention its function. Marks:2View AnswerAnswer:
Out of syllabus -
Q9
What is respiration quotient (RQ)? Under what conditions will the value of RQ be 1? Explain. Marks:2View AnswerAnswer:
Out of syllabus -
Q10
What is resting membrane potential of a neuron? What is the role of sodium-potassium pumps in maintaining it? Marks:2View AnswerAnswer:
Out of syllabus
