Biology:2007:CBSE: [All India ]:Set-I
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Q1
What is diphyodont ? Marks:1View AnswerAnswer:
Diphyodont is a type of dentition which bears two sets of teeth. A set of temporary milk or deciduous teeth replaced by a set of permanent or adult teeth. Majority of mammals including humans have diphyodont dentition.
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Q2
Name the plant hormone that controls apical dominance and a plant hormone that reduces it. Marks:1View AnswerAnswer:
Out of syllabus -
Q3
Name the dominant producers in deep aquatic ecosystem. What other name could you give to a primary consumer? Marks:1View AnswerAnswer:
Multicellular alga. Herbivores. -
Q4
Expand ECG. Give one use of this technique. Marks:1View AnswerAnswer:
Electro Cardio Graph. It is a graphical representation of the electrical activity of the heart during a cardiac cycle. It helps in detecting abnormalities of the heart.
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Q5
What are the two kinds of forces involving water molecules that allow water to travel upward in plants ? Marks:1View AnswerAnswer:
Out of syllabus -
Q6
Draw a diagram of L.S. of an anatropous ovule of an Angiosperm and label the following parts :
(i) Nucellus
(ii) Integument
(iii) Antipodal cell
(iv) Secondary nucleus Marks:2View AnswerAnswer:
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Q7
A patient was complaining of frequent urination, excessive thirst and dehydration. His fasting glucose level was not found to be normal. Name the disease and explain its cause. Marks:2View AnswerAnswer:
(i) Diabetes mellitus (ii) Hyposecretion of insulin -
Q8
What does the term genetic diversity refer to? What is the significance of large genetic diversity in a population? Marks:2View AnswerAnswer:
The total number of genetic characteristics in the genetic makeup of any given species is termed as genetic diversity. It is a level of biodiversity. The genetic diversity is the function of the population. The larger the population, greater is the genetic diversity.This provides better stability to species by offering more variations to adapt for the population, in the case of changing environmental conditions . Thus the survival of the species is ensured. -
Q9
Why is conversion of pyruvic acid to acetyl CoA called oxidative decarboxylation? Where does it occur in a cell ? Marks:2View AnswerAnswer:
Out of syllabus -
Q10
How are ephemeral plants adapted to withstand hot and dry environment? Explain. Marks:2View AnswerAnswer:
Out of syllabus
