CBSE Class 11 Biology Photosynthesis in Higher Plants MCQs

Question : The water of guttation is forced out of the leaves by:
a) Diffusion
b) Root Pressure
c) Imbibition
d) Active transport
Answer : B

Question : The movement of solvent molecules through a semi-permeable membrane from a region of low solute concentration to a region of high solute concentration is:
a) Diffusion
b) Plasmolysis
c) Osmosis
d) Active transport
Answer : C

Question : The osmotic pressure of a solution
a) increases with increase in concentration of solute
b) decrease with increase in concentration of solute
c) remains unchanged with increase in concentration of sol
d) none of these
Answer : A

Question : The transport of substances from a region of its lower concentration to its higher concentration is called:
a) Osmosis
b) Imbibition
c) Active transport
d) Passive transport
Answer : C

Question : The taking up of a liquid by a substance with the resultant swelling in volume is called:
a) Plasmolysis
b) Imbibitions
c) Diffusion
d) Active transport
Answer : B

Question : Germination of seed involves the rupturing of seed coat because of:
a) Osmosis
b) Imbibitions
c) Diffusion
d) Active transport
Answer : B

Question : The shrinkage of protoplasm due to ex-osmosis of water from the cell is called:
a) Osmosis
b) Deplasmolysis
c) Plasmolysis
d) Imbibition
Answer : C

Question : The process where by water moves through the plants is known as :
a) Transpiration 
b) Translocation
c) Guttation
d) Osmosis
Answer : B

Question : Which of the following conducts water inside plant body?
a) phloem
b) xylem
c) cortex
d) pith
Answer : B

Question : The exudation of water drops from the leaves of intact plants is:
a) guttation
b) transpiration
c) evaporation
d) transportation
Answer : A

Question :  In which of the following assimilates move along the concentration gradient?
a) sieve tubes
b) xylem vessels
c) trachieds
d) fibers
Answer : A

Question : Which of the following percentage of transpiration usually occurs through the stomata?
a) 30%
b) 50%
c) 60%
d) 90%
Answer : D

Question : The combined area of total stomatal pores as compared to the total leaf area is almost:
a) 1-2%
b) 3-4%
c) 5-6%
d) 7-8%
Answer : A

Question : The number of stomata per square centimeter of leaf surface of tobacco leaf is almost:
a) 1200
b) 2100
c) 12000
d) 21000
Answer : C

Question : The processes involved in stomatal transpiration are:
a) 2 
b) 4   
c) 8 
d) 6
Answer : A

Question : When leaf cells are fully turgid, the transpiration rate is:
a) high
b) medium
c) low
d) not affected
Answer : A

Question : The rate of water evaporation doubles for every temperature rise of:
a) 10 ^oC
b) 20 ^oC
c) 5 ^oC
d) 25 ^oC
Answer : A

Question : Oxygen gas released during photosynthesis is comes from:
a) Water
b) CO₂ 
c) Glucose
d) None of these
Answer : A

Question : Chlorophylls c, d and e are present in:
a) Angiosperms
b) Gymnosperms
c) Bacteria
d) Algae
Answer : D

Question : Chlorophyll is a large molecule with a central core of:
a) Iron
b) Sulphur
c) Nitrogen
d) Magnesium
Answer : D

Question : Chlorophyll mainly absorbs red light and:
a) Green light
b) Yellow light
c) Blue light
d) Orange light
Answer : C

Question : In the photo system II, high energy electrons of chlorophyll molecule are accepted by:
a) PC
b) PQ
c) NAD
d) ATP
Answer : B

Question : During light reaction of photosynthesis, ATP formation occurs when electrons are transported between cytochrome:
a) a and b   
b) b and c
c) b and f   
d) c and f
Answer : C

Question : High energy electrons in photo system I are transferred from FRS to:
a) ATP
b) PC
c) NADP
d) PQ
Answer : C

Question : As a first identifiable product of the dark reaction is:
a) PGA
b) PGAL
c) Glucose
d) RuBP
Answer : C

Question : Light reaction of photosynthesis occurs in:
a) Granum
b) Stroma
c) Mitochondria
d) Leucoplast
Answer : A

Question : The break down of water molecule (photolysis) in photosynthesis occurs during:
a) light reaction
b) dark reaction
c) Glycolysis
d) Krebs cycle
Answer : A

Question : The wave lengths of red light are in the range of: 
a) 400-500 nm
b) 500-550 nm
c) 600-650 nm
d) 700-750 nm
Answer : D

Question : Which of the following are the principal photoreceptors in the chloroplast of green plants?
a) Chlorophyll b and c
b) Chlorophyll a and b
c) Chlorophyll and d
d) Chlorophyll d and c
Answer : B

Question : The sequence of electron acceptors in the light reaction is
a) PQ—cyf f—cyt b—-PC
b) PQ—PC—Cytb—-Cyt f
c) PQ—PC—Cyt f—-Cytb
d) PQ—Cyt b—Cyt f—-PC
Answer : D

Question : Which of the following is the source of hydrogen in the glucose molecule formed during photosynthesis?
a) Water
b) CO₂
c) ATP
d) NADP
Answer : A

Question : Which of the following are products of light reaction?
a) NADPH₂ and Water
b) NADPH₂ and ATP
c) ADP and ATP
d) NADPH₂ and Glucose
Answer : B

Question : In the dark reaction, ATP and NADPH₂ react with:
a) RuBP
b) PGA
c) PGAL
d) Glucose
Answer : C

Question : Chlorophyll “a” occurs in all Photosynthetic plants except:
a) Green algae
b) Blue green algae
c) Angiosperms
d) Pigment containing bacteria
Answer : D

Question : When the fluid outside a cell has a greater concentration of a given molecule than the fluid inside the cell, the external fluid is
a) isotonic
b) hypertonic
c) hypotonic
d) ultratonic
Answer : B

Question : The osmotic pressure of pure water is:
a) 0
b) 1
c) 10
d) 100
Answer : A

Question : The water potential of all solutions as compared to pure water is always:
a) higher
b) lower
c) equal
d) none of these
Answer : B

Question : The wavelengths of visible light are longer than the wavelengths of
a) infrared
b) ultraviolet
c) microwaves
d) radio waves
Answer : B

Question : The wavelengths of visible light are shorter than the wavelengths of
a) infrared
b) ultraviolet
c) x-rays   
d) gamma rays
Answer : A

Question : Which of the following colours of light work best for photosynthesis?
a) Red
b) Yellow
c) Blue
d) Both a and c
Answer : D

Question : Which of the following is the worlds most common protein?
a) cellulose
b) ribulose biphosphate carboxylase
c) insulin
d) diastase
Answer : B

Question : Photophosphorrylation in a chloroplast is mot similar to which of the following mitochondrial reaction?
a) substrate-level phosphorylation
b) oxidative phosphorylation
c) oxidative decarboxylation
d) hydrolysis
Answer : B

Question : A photosystem is an assemblage of pigment molecules together ranging from
a) 10 – 100
b) 100 – 200
c) 200 – 400
d) 400 – 500
Answer : C

Question : The final acceptor of electrons during the light reaction of photosynthesis is:
a) Cyt. F
b) Cyt. B   
c) ATP   
d) NADP
Answer : D

Question : Which of the following is obtained from posphoglyceraldehyde in the dark reaction of photosynthesis?
a) phosphoglyceric acid
b) glucose
c) carbon dioxide
d) plastoquinone
Answer : B

Question : Which of the following conditions in a plant cell would increase the uptake of water?
a) osmotic pressure is higher than the turgor pressure
b) osmotic pressure is equal to turgor pressure
c) osmotic pressure is less than the turgor pressure
d) both a and c
Answer : A

Question : Which of the following would occur when a plant cell is packed in a fluid with high osmotic concentration than the cell sap?
a) imbibition
b) Plasmolysis   
c) Deplasmolysis   
d) Diffusion
Answer : B

Question : With the increase of ions in the xylem its water potential becomes
a) more positive
b) more negative
c) zero   
d) neutral
Answer : B

Question : Water potential of a liquid increases when solute concentration
a) Increases
b) Decreases
c) Remains unchanged
d) None of these
Answer : B

Question : Which of the following is not true of the exudation of water?
a) water drops come out through stomata
b) water drops come out through hydathodes
c) water is forced out of the leaves by root pressu
d) water drops are not formed by dew
Answer : A

Question : Water in the xylem vessel will ascend up until
a) its cohesive and adhesive strength is more than the gravitational pull
b) gravitational pull is higher then the cohesive and adhesive strength of water
c) sufficient water is available in the soil
d) it is used in the photosynthesis
Answer : A

Question : Plants do not store carbohydrates as glucose because it
a) dissolves in water, thereby altering the osmotic bala
b) attracts insects herbivores
c) is an unstable molecule
d) would replace ribose in DNA synthesis
Answer : A

Question : Which of the following processes is responsible for the entry of water into root hair?
a) wall pressure   
b) osmotic pressure
c) turgor pressure   
d) atmospheric pressure
Answer : B

Question : Which of the following forces are responsible for the ascent of water in plant body?
a) atmospheric pressure   
b) root pressure
c) transpiration pull     
d) both b and c
Answer : D

Question : Of the total sunlight reaching the earth, the percentage used in the photosynthesis is:
a) 2%
b) 20%
c) 30%
d) 50%
Answer : A

Question : Which of the following products of light reaction of photosynthesis is not used in the dark reaction?
a) ATP
b) NADPH₂
c) Oxygen
d) None of these
Answer : C

Question : The empirical formula of chlorophyll a is:
a) C₅₅ H₇₂ O_{5 N4} Mg
b) C₅₅ H₇₀ O_{5 N3} Mg
c) C₅₆ H₇₂ O₆₆ N₄ Mg
d) C₅₅ H₇₄ O₅ N₅ Mg
Answer : A

Question : Which of the following is true of chlorophyll?
a) absorbs all types of waves of sunlight
b) containing iron atom in the center
c) containing magnesium atom in the center
d) present in all cells of green plants
Answer : C

Question : The most effective light absorbed by the chlorophyll is:
a) yellow   
b) orange
c) green   
d) none of these
Answer : D

Question : Photosystem I has an absorption spectrum of wavelengths of around
a) 600 nm   
b) 650 nm   
c) 680 nm
d) 700 nm
Answer : D

Question : Which of the following is not necessary for photosynthesis?
a) CO₂   
b) Chlorophyll   
c) H₂O   
d) Oxygen
Answer : D

Question : In photosystem II, the electrons lost by reaction center are replaced by electrons from
a) H₂O
b) C₂ O
c) Photosystem I
d) ATP
Answer : A