This practice includes 25 important multiple choice questions from the chapter Photosynthesis In Plants (Class 11th Biology).
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Q.1.
The rate of photosynthesis is controlled by
- the rate of light reaction
- the rate of dark reaction
- the rates of both light and dark reactions
- none of the above
Answer:
(b) the rate of dark reaction
Explanation: the rate of dark reaction
Explanation: the rate of dark reaction
Q.2.
The end product of the Calvin cycle is ______.
- RuBP
- PGAL
- PGA
- ADP + NADP
Answer:
(a) RuBP
Explanation: RuBP
Explanation: RuBP
Q.3.
The primary carbon dioxide acceptor in C4 cycle is
- malic acid
- phosphoenol pyruvate
- rubisco
- aspartic acid
Answer:
(b) phosphoenol pyruvate
Explanation: The primary carbon dioxide acceptor in C4 pathway is phosphoenol pyruvate
Explanation: The primary carbon dioxide acceptor in C4 pathway is phosphoenol pyruvate
Q.4.
The law of limiting factor was given by
- Calvin
- Blackman
- Priestley
- None of these
Answer:
(b) Blackman
Explanation: If a chemical process is affected by more than one factor, then its rate will be detrmined by the factor which is nearest to its minimal value
Explanation: If a chemical process is affected by more than one factor, then its rate will be detrmined by the factor which is nearest to its minimal value
Q.5.
The metabolic pathway which produces carbohydrate is
- Calvin cycle
- Glycolysis
- Cyclic electron pathway
- Krebs cycle
Answer:
(a) Calvin cycle
Explanation: Calvin cycle
Explanation: Calvin cycle
Q.6.
Manganese is required in
- Chlorophyll synthesis
- Nucleic acid synthesis
- Plant cell wall formation
- Photolysis of water during photosynthesis
Answer:
(d) Photolysis of water during photosynthesis
Explanation: Photolysis of water during photosynthesis
Explanation: Photolysis of water during photosynthesis
Q.7.
Oxidative phosphorylation refers to
- Anaerobic production of ATP
- The citric acid cycle production of ATP
- Production of ATP by chemiosmosis
- Alcoholic fermentation
Answer:
(c) Production of ATP by chemiosmosis
Explanation: Production of ATP by chemiosmosis
Explanation: Production of ATP by chemiosmosis
Q.8.
Which of the following is not an accessory pigment?
- Carotene
- Chlorophyll a
- Chlorophyll b
- Xanthophyll
Answer:
(b) Chlorophyll a
Explanation: Chlorophyll a is a primary pigment.
Explanation: Chlorophyll a is a primary pigment.
Q.9.
Besides water and CO2, which is more essential a raw material for food formation
- light
- oxygen
- NAD
- mineral salt
Answer:
(a) light
Q.10.
In actively gro – wing young plants, the best data for estimating the rate of photosynthesis would be
- ratio of oxygen evolved to carbon dioxide absorbed
- increase in fresh weight
- increase in dry weight
- increase in carbohydrate
Answer:
(a) ratio of oxygen evolved to carbon dioxide absorbed
Q.11.
Discovery of Emerson effect has already shown the
- two distinct photochemical reactions
- light and dark reactions of photosynthesis
- photophosphorylation
- photorespiration
Answer:
(a) two distinct photochemical reactions
Explanation: two distinct photochemical reactions
Explanation: two distinct photochemical reactions
Q.12.
Translocation of sugar in flowering plants occurs in the form of
- glucose
- sucrose
- starch
- maltose
Answer:
(b) sucrose
Explanation: sucrose is used for translocation of sugar in flowering plants
Explanation: sucrose is used for translocation of sugar in flowering plants
Q.13.
Where are thylakoids and grana located?
- Lysosomes
- Mitochondria
- Chloroplasts
- Golgi apparatus
Answer:
(c) Chloroplasts
Q.14.
Who enunciated the law of limiting factor for photosynthesis?
- Robert Emerson
- Ruben
- Blackman
- Calvin
Answer:
(c) Blackman
Explanation: Blackman enunciated the law of limiting factor for photosynthesis
Explanation: Blackman enunciated the law of limiting factor for photosynthesis
Q.15.
Which one of the following statement is true for ATP?
- ATP is prosthetic part of an enzyme
- ATP is an enzyme
- ATP is organic ions of enzyme
- ATP is a Co-enzyme
Answer:
(d) ATP is a Co-enzyme
Q.16.
Kranz anatomy is a feature of
- C3 plants
- CAM plants
- C4 plants
- All of these
Answer:
(c) C4 plants
Explanation: Kranz anatomy is a feature of C4 plants. Kranz means wreath.It tells about the arrangement of cells
Explanation: Kranz anatomy is a feature of C4 plants. Kranz means wreath.It tells about the arrangement of cells
Q.17.
Which of the following is a 4-carbon compound?
- Oxaloacetic acid
- Phosphoglyceric acid
- Ribulose biphosphate
- Phosphoenolpyruvate
Answer:
(a) Oxaloacetic acid
Q.18.
Which of the following process (C4 cycle) occurs in bundle sheath cells?
- Regeneration
- Fixation
- Carboxylation
- Decarboxylation
Answer:
(d) Decarboxylation
Q.19.
Light reactions of photosynthesis occurs in
- stroma
- thylakoid
- grana
- cytoplasm of cell
Answer:
(c) grana
Explanation: Light reactions of photosynthesis occurs in grana.
Explanation: Light reactions of photosynthesis occurs in grana.
Q.20.
Water stress causes
- opening of stomata
- increase in metabolic rate
- wilting of leaves
- lesser availability of carbon dioxide
Answer:
(c) wilting of leaves
Explanation: Water stress causes closure of stomata. Since stomata is closed carbon dioxide available to plants is less.
Explanation: Water stress causes closure of stomata. Since stomata is closed carbon dioxide available to plants is less.
Q.21.
During photochemical reaction of photosynthesis–
- liberation of O2 takes place
- Formation of ATP and NADPH2 take place
- Liberation of O2, formation of ATP, and NADPH2 takes place
- Assimilation of CO2 takes place
Answer:
(c) Liberation of O2, formation of ATP, and NADPH2 takes place
Q.22.
In the half-leaf experiment of photosynthesis, KOH solution is used because
- It provides O2 to the leaf.
- It provides moisture to the leaf.
- t helps in CO2 fixation
- It absorbs CO2
Answer:
(d) It absorbs CO2
Q.23.
Structurally, chlorophyll a and b are different as
- Chl a has a methyl group and Chl b has an aldehyde group.
- Chl a has an aldehyde group and Chl b has a methyl group.
- Chl a has an ethyl group and Chl b has an aldehyde group
- Chl a has a carboxyl group and Chl b has an aldehyde group.
Answer:
(a) Chl a has a methyl group and Chl b has an aldehyde group.
Q.24.
Fixation of one CO2 molecule through Calvin cycle requires:
- 1 ATP and 2NADPH2
- 2ATP and 2NADPH2
- 3ATP and 2NADPH2
- 2ATP and 1NADPH2
Answer:
(c) 3ATP and 2NADPH2
Explanation: 3ATP and 2NADPH2
Explanation: 3ATP and 2NADPH2
Q.25.
Which one of the following statements about cytochrome P-450 is wrong?
- It is a colored cell
- It is an enzyme involved in oxidation reaction
- It has an important role in metabolism
- It contains iron
Answer:
(a) It is a colored cell
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