Page 103 - Biology - XII

VIVA VOCE

Q1. Why did you keep the seeds under three conditions, i.e. one was dry, other soaked, and
third killed?
Ans. It was done so as to study the release of heat during respiration at diff erent conditions.

Q2. What is respiration?
Ans. The process by which energy is obtained by oxidation of (various photosynthetic products) food is
called respiration.

Q3. Why did you use a thermos fl ask instead of a test tube?
Ans. Because ‘heat’ does not escape out in a thermos fl ask. Whereas if a test tube was to be used, heat
would have been lost and correct results would not have come.

Q4. Why heat-killed seeds do not respond?
Ans. Because they have been killed by heat. The enzymes needed for the respiration also get destroyed
and hence no response.

Q5. What was the result?
Ans. The germinating seeds release more heat energy.

COMPETENCY BASED QUESTIONS

Multiple Choice Questions

Q1. RQ (Respiratory Quotient) value for carbohydrates is
(a) less than unity (b) more than unity (c) unity (d) none of these

Q2. The amount of energy or % of energy from glucose converted to ATPs is
(a) 20% (b) 100% (c) 60% (d) 40%

Q3. During the synthesis of one molecule of glucose 18 ATPs are utilised. But breakdown of one
glucose molecule releases
(a) 18 ATPs (b) 28 ATPs (c) 38 ATPs (d) 48 ATPs

Volume of CO evolved
Q4. What does this equation represent: 2 ?
Volume of O absorbed used/
2
(a) Respiration (b) Photosynthesis (c) Oxidation (d) None of these

Q5. Respiration is important because
(a) it releases energy (b) it converts insoluble food to soluble form

(c) it releases CO (d) all of these
2
Answer key

1. (c), 2.(d), 3. (c), 4. (d), 5. (d)

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