Biology:2006:CBSE:[All India ]:Set-I
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Q1
What is haemocoel? Marks:1View AnswerAnswer:
Organisms with open circulatory systems have series of spaces between their organs through which the hemolymph circulates. -
Q2
What do you call the study of the timing of seasonal activities of plants in relation to change in environmental conditions? Marks:1View AnswerAnswer:
Phenology. -
Q3
What happens to the glycogen concentration in the liver cells when the concentration of adrenaline in the blood stream increases? Marks:1View AnswerAnswer:
Adrenaline causes elevation of blood glucose by promoting the breakdown of liver glycogen into glucose; hence it reduces the glycogen level of liver. -
Q4
Where does fertilization normally take place in a human female? Marks:1View AnswerAnswer:
Fallopian tube. -
Q5
A 30-year-old man with a history of no prior immunization steps on a nail while walking barefoot in his courtyard and bleeds. Which immunizations should he undergo? Marks:1View AnswerAnswer:
Immunized against tetanus. -
Q6
Name the respective mineral nutrient element of plants that
(i) is needed in the synthesis of auxinsss
(ii) is a constituent of ferredoxin. (iii) forms the core constituent of the ring structure of chlorophyll. (iv) forms the component of nitrogenase and nitrate reductase. Marks:2View AnswerAnswer:
(i) is needed in the synthesis of auxins: Zinc
(ii) is a constituent of ferredoxin: Iron
(iii) forms the core constituent of the ring structure of chlorophyll: Manganese
(iv) forms the component of nitrogenase and nitrate reductase: Molybdenum -
Q7
Explain how the hormones glucagon and insulin are antagonistic to each other in their action. Marks:2View AnswerAnswer:
Antagonistic characters of Glucagon and Insulin can be compared as:S.No.
Character
Insulin
Glucagon
1.
Blood sugar level
Decreases blood sugar level.
Increases blood sugar level .
2.
Gluconeogenesis (i.e. conversion of nutrients such as amino acids into glucose)
Promotes uptake of glucose by liver and muscle cells thereby, decreasing Gluconeogenesis.
Promotes conversion of amino acids and lactic acids stored in liver cells into glucose thereby, increasing Gluconeogenesis.
3.
Glycogenolysis (breakdown of glycogen into glucose)
Increases Glycogenolysis
Decreases Glycogenolysis.
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Q8
List any four ways how the use of auxins may help in obtaining better yield of fruit crops. Marks:2View AnswerAnswer:
(i) Development of parthenocarpic fruit. (ii) Control of pre-harvest drop of fruits. (iii) Enhancing flowering. (iv) used as weedicide. -
Q9
What is quarantine? Why is quarantine essential before introducing a plant species from another country? Marks:2View AnswerAnswer:
Careful examination of introduced crop plants and animals, for the presence of weeds, insects and disease causing organism is known as Quarantine.
- It is essential to check entry of weeds, pathogens and insects along with introduced plant material into our country. -
Q10
Two groups (A and B) of bean plants of similar size and same leaf area were placed in identical conditions. Group A was exposed to light to wavelength of 400-450nm, and Group B to light of wavelength of 500-550 nm. Compare the photosynthetic rate of the two groups giving reason. Marks:2View AnswerAnswer:
Photosynthetic rate of group A will be more than group B because the wavelength of light to which group A is exposed corresponds to the excitation maxima of ‘chlorophyll a’.
