Biology:2006:CBSE [ Delhi ]:Set-II
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Q1
What prevents collapsing of our trachea during breathing? Marks:1View AnswerAnswer:
Cartilaginous rings around trachea prevent it from collapsing during breathing. -
Q2
What advantage does the sea anemone get in the sea anemone-hermit crab facultative mutualism? Give an alternative term for this kind of mutualism. Marks:1View AnswerAnswer:
Sea anemone is transported to new food sources. This type of mutualism is also called protocooperation. -
Q3
Name the nitrogenous waste excreted in the larval and adult stages of frog respectively. Marks:1View AnswerAnswer:
Ammonia and urea are the nitrogenous wastes that are removed in the larval (Tadpole) and adult stage of a frog respectively. -
Q4
Correct the statement given below with respect to brazzein:
“Brazzein is a high calorie carbohydrate.”Marks:1View AnswerAnswer:
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Q5
Name the enzyme, which acts on carbonic acid in living cells. Marks:1View AnswerAnswer:
Out of syllabus -
Q6
What is reverse osmosis? Give its one application. Marks:2View AnswerAnswer:
Reverse osmosis is the movement of pure solvent through a membrane resulting in the concentration of the solute particles on the other side of the membrane on which the pressure is applied.
This process is used in Heamodialysis which is used to help patients suffering from renal failure. -
Q7
How is polyspermy prevented in humans? Marks:2View AnswerAnswer:
As one sperm fertilizes with the ovum, it induces certain biochemical and physiological changes in the zona pellucida of the ovum. This prevents other sperms from entering the ovum, thus polyspermy is prevented in the case of humans. -
Q8
Write the full form of ELISA? Give example of the clinical application of ELISA test. Marks:2View AnswerAnswer:
Enzyme linked immunosorbent assay. ELISA helps in detection of HIV infection. -
Q9
What is fermentation? Name any two organic compounds produced in this process. Marks:2View AnswerAnswer:
Fermentation is a type of anaerobic respiration, especially in microbes, leading to the formation of organic compounds and carbon dioxide. The two organic compounds are lactic acid and ethanol. -
Q10
What is glycolysis? Name the two monosaccharides which readily enter the glycolytic pathway. Marks:2View AnswerAnswer:
Glycolysis is partial oxidation of glucose molecule into two Pyruvic acid molecules resulting in a net gain of ATP molecules (source of energy).
Glucose and Fructose are the monosaccharides readily entering the Glycolytic pathway.
