Biology:2006:CBSE:[ Delhi ]:Set-I
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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
In a wheat field, some broad-leaved weeds were found by a farmer. Which phytohormone can be used to eradicate them? Marks:1View AnswerAnswer:
Presence of broad leaves is a significant character of Dicotyledonous plants. 2, 4-D (Auxin) is widely used to control dicotyledonous weeds mostly in the monocotyledonous crop fields. -
Q5
Correct the statement given below with respect to brazzein:
“Brazzein is a high calorie carbohydrate.”Marks:1View AnswerAnswer:
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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
Which two heart sounds are heard through the stethoscope when placed on the chest? When are these sounds produced respectively? Marks:2View AnswerAnswer:
The two heart sounds that can be heard through a stethoscope are Lub and Dub.
Lub sound is produced due to closing of tricuspid and bicuspid valves at the start of ventricular systole and Dub due to closing of semilunar valves at the start of ventricular diastole. -
Q8
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. -
Q9
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. -
Q10
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.
