This practice test includes 25 important multiple-choice questions (MCQ) from the chapter Respiration In Plants in Class 11th Biology for NEET-UG, viva, medical, and other competitive entrance exams.
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Q.1.
R.Q is ratio of
- CO2 produced to substarate consumed
- CO2 produced to O2 consumed
- oxygen consumed to CO2 produced
- oxygen consumed to water produced
Answer:
(b) CO2 produced to O2 consumed
Explanation: CO2 produced to O2 consumed
Explanation: CO2 produced to O2 consumed
Q.2.
Angiosperm pollen is generally released at the
- 1 – celled stage
- 2 – celled stage
- 3 – celled stage
- male gamete formation stage
Answer:
(b) 2 – celled stage
Q.3.
The complete oxidation of pyruvate take place in
- cell cytoplasm
- inner mitochondrial membrane
- mitochondrial matrix
- nucleus
Answer:
(c) mitochondrial matrix
Explanation: Pyruvate is transported from cytoplasm into the mitochondria. The complete oxidation of pyruvate takes place in matrix of mitochondria
Explanation: Pyruvate is transported from cytoplasm into the mitochondria. The complete oxidation of pyruvate takes place in matrix of mitochondria
Q.4.
Which enzyme catalyses the reaction below? Pyruvic acid → Carbon dioxide + Ethanol
- Pyruvic acid decarboxylase
- Alcohol dehydrogenase
- None of these
- Both of these
Answer:
(d) Both of these
Explanation: In fermentation, the incomplete oxidation of glucose is achieved under anaerobic conditions by sets of reactions in which pyruvic acid is converted to carbon dioxide and ethanol.
Explanation: In fermentation, the incomplete oxidation of glucose is achieved under anaerobic conditions by sets of reactions in which pyruvic acid is converted to carbon dioxide and ethanol.
Q.5.
TCA cycle was discovered by
- Otto Meyerhof
- Hans Kreb
- Gustav Embden
- All of these
Answer:
(b) Hans Kreb
Explanation: TCA cycle or tricarboxylic acid cycle was given by Hans Kreb. So it is also called as Kreb cycle.
Explanation: TCA cycle or tricarboxylic acid cycle was given by Hans Kreb. So it is also called as Kreb cycle.
Q.6.
Which one of the following describes the spikelet of a cereal or grass plant
- inferior ovary
- dehiscent fruit
- pair of glumes
- fused calyx
Answer:
(c) pair of glumes
Explanation: pair of glumes
Explanation: pair of glumes
Q.7.
Malacophily means
- pollination by wind
- pollination by water
- pollination by insects
- pollination by snails
Answer:
(d) pollination by snails
Explanation: pollination by snails
Explanation: pollination by snails
Q.8.
Herkogamy is a contrivance for
- allogamy
- autogamy
- chasmogamy
- cleistogamy
Answer:
(a) allogamy
Explanation: allogamy
Explanation: allogamy
Q.9.
Out of 36 ATP molecules produced per glucose molecule during respiration
- 2 are produced outside glycolysis and 34 during repiratory chain
- 2 are produced outside mitochondria and 34 inside the mitochondria
- all the formed inside mitochondria
- 2 during glycolysis and 34 during kreds cycle
Answer:
(b) 2 are produced outside mitochondria and 34 inside the mitochondria
Explanation: 2 are produced outside mitochondria and 34 inside the mitochondria
Explanation: 2 are produced outside mitochondria and 34 inside the mitochondria
Q.10.
Complete the reaction. _________ + O2 → CO2 + _______ + Energy
- C6H12O6, 2H2O
- C12H22O11, 6H2O
- C6H12O6, 6H2O
- C12H22O11, 11H2O
Answer:
(c) C6H12O6, 6H2O
Explanation: C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy
Explanation: C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy
Q.11.
The significant morphological feature of passion flower is the presence of
- numerous corolla
- androphore
- gynophore
- androgynophore
Answer:
(b) androphore
Q.12.
The final electron acceptor in electron transport chain is
- Cytochrome C
- FADH
- NADH
- oxygen
Answer:
(d) oxygen
Explanation: Oxygen acts as the final electron acceptor in electron transport chain.
Explanation: Oxygen acts as the final electron acceptor in electron transport chain.
Q.13.
Which of the following acts as mobile carrier for transfer of electrons between complex III and complex IV?
- Cytochrome c
- cytochrome a3
- cytochrome a
- FADH2
Answer:
(a) Cytochrome c
Explanation: Cytochrome c is a small protein attached to outer surface of the inner membrane and acts as mobile carrier for transfer of electrons between complex III and IV.
Explanation: Cytochrome c is a small protein attached to outer surface of the inner membrane and acts as mobile carrier for transfer of electrons between complex III and IV.
Q.14.
Aleurone layer takes part in
- protection of delicate embryo
- enzyme synthesis
- transfer of food to cotyledons
- transfer of food from cotyledons to embryo tips
Answer:
(b) enzyme synthesis
Q.15.
A characteristic of drupe is
- fleshy seed coat
- stony pericarp
- stony mesocarp
- stony endocarp
Answer:
(d) stony endocarp
Explanation: stony endocarp is characteristic of drupe is
Explanation: stony endocarp is characteristic of drupe is
Q.16.
Incomplete oxidation of glucose into pyruvic acid with several intermediate steps is know as
- TCA pathway
- Glycolysis
- Hms pathway
- Glycolysis
Answer:
(b) Glycolysis
Q.17.
End product of glycolysis is
- acetyl Coenzyme A
- PEP
- pyruvate
- OAA
Answer:
(c) pyruvate
Explanation: The end product of glycolysis is pyruvate.
Explanation: The end product of glycolysis is pyruvate.
Q.18.
Respiratory enzymes are located in
- mitochondrial matrix
- Cristae
- perimitochondrial space
- outer membrane
Answer:
(b) Cristae
Q.19.
Respiratory quotient of carbohydrates is
- 0.9
- 1.2
- 1
- 0
Answer:
(c) 1
Explanation: RQ i.e. respiratory quotient is 1.RQ = volume of CO2 evolved / volume of O2 consumed
Explanation: RQ i.e. respiratory quotient is 1.RQ = volume of CO2 evolved / volume of O2 consumed
Q.20.
One molecule of glucose yields ___ ATP molecules in aerobic respiration.
- 2
- 16
- 38
- 42
Answer:
(c) 38
Explanation: One molecule of glucose yields 38 molecules of ATP during aerobic respiration.
Explanation: One molecule of glucose yields 38 molecules of ATP during aerobic respiration.
Q.21.
When one glucose molecule is completely oxidised, it changes:
- 36 ADP molecules into 36 ATP molecules
- 38 ADP molecules into 38 ATP molecules
- 30 ADP molecules into 30 ATP molecules
- 32 ADP molecules into 32 ATP molecules
Answer:
(b) 38 ADP molecules into 38 ATP molecules
Explanation: 38 ADP molecules into 38 ATP molecules
Explanation: 38 ADP molecules into 38 ATP molecules
Q.22.
Most of the energy of the carbohydrates is released by oxidation when
- Pyruvic acid is converted into CO2 and H2O
- Pyruvic acid is converted into acetyl Co-A
- Sugar is converted into pyruvic acid
- Glucose is converted into alcohol and CO2
Answer:
(a) Pyruvic acid is converted into CO2 and H2O
Explanation: Pyruvic acid is converted into CO2 and H2O
Explanation: Pyruvic acid is converted into CO2 and H2O
Q.23.
Acetyl CoA combine with oxalo-acetate in presence of condensing enzyme citrate synthase to form 6-C compound called
- Malic acid
- Tartaric acid
- Pyruvic acid
- Citric acid
Answer:
(d) Citric acid
Explanation: Citric acid
Explanation: Citric acid
Q.24.
Number of oxygen atoms required for aerobic oxidation of one pyruvate
- 10
- 8
- 5
- 12
Answer:
(a) 10
Explanation: 10 Number of oxygen atoms required for aerobic oxidation of one pyruvate
Explanation: 10 Number of oxygen atoms required for aerobic oxidation of one pyruvate
Q.25.
Most of the enzymes of the TCA cycle are present in
- Intermembrane space of mitochondria
- Mitochondrial matrix
- Inner membrane of mitochondria
- Cytoplasm
Answer:
(b) Mitochondrial matrix
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