Well structured WBBSE Class 9 Life Science MCQ Questions Chapter 3.1A Plant Physiology: Photosynthesis can serve as a valuable review tool before exams.
Plant Physiology: Photosynthesis Class 9 WBBSE MCQ Questions
Multiple Choice Questions & Answers
Question 1.
Which of the following is/are plant physiological process/processes?
A. Respiration
B. Transpiration
C. Photosynthesis
D. All of these
Answer:
D. All of these
Question 2.
Which of the following components is/are necessary for photosynthesis?
A. Light and chlorophyll
B. Carbon dioxide
C. Water
D. All of these
Answer:
D. All of these
Question 3.
The gas released during photosynthesis is- …………..
A. Oxygen
B. Carbon dioxide
C. Both A. and B.
D. None of these
Answer:
A. Oxygen
Question 4.
The type of tissue, which serves as the site of photosynthesis, is-…………..
A. Meristematic tissue
B. Mesophyll tissue
C. Epidermal tissue
D. Vascular tissue
Answer:
B. Mesophyll tissue
Question 5.
The main end product of photosynthesis is-…………..
A. Glucose
B. Starch
C. Fructose
D. Glycogen
Answer:
A. Glucose
Question 6.
During photosynthesis, terrestrial plants absorb this gas from atmosphere. Which gas is it?
A. H2O
B. CO2
C. O2
D. None of these
Answer:
B. CO2
Question 7.
Aquatic plants absorb CO2 through-…………..
A. Stomata
B. Root hair
C. Body surface
D. Leaves
Answer:
C. Body surface
Question 8.
in plants, stomata help in-…………..
A. Absorption of CO2 and O2
B. Exchange of CO2 and O2 and release of extra water as vapour
C. Intake of CO2 and release of extra water as vapour
D. None of these
Answer:
B. Exchange of CO2 and O2 and release of extra water as vapour
Question 9.
The cell organelle in plants, acting as the site of photosynthetic reactions, is-…………..
A. Chloroplast
B. Chromoplast
C. Leucoplast
D. Mitochondrion
Answer:
A. Chloroplast
Question 10.
in flowering green plants, photosynthesis occurs in-…………..
A. Leaves only
B. Leaves, sepals, green fruit skin and tender stems
C. Leaves, stems and roots
D. Leaves and tender stems
Answer:
B. Leaves, sepals, green fruit skin and tender stems
Question 11.
Select the correct statement-…………..
A. Light reactions of photosynthesis occur in the presence of sunlight.
B. Photosynthesis can take place only under sunlight.
C. Dark reaction is hindered in the presence of sunlight.
D. Glucose is produced as a by-product in light reaction.
Answer:
A. Light reactions of photosynthesis occur in the presence of sunlight.
Question 12.
The only metallic element present in chlorophyll is-…………..
A. Carbon
B. Copper
C. Iron
D. Magnesium
Answer:
D. Magnesium
Question 13.
Source of oxygen, released during photosynthesis, is-…………..
A. CO2
B. H2O
C. Both A. and B.
D. None of these
Answer:
B. H2O
Question 14.
The colour of light preferable for maximum rate of photosynthesis, is-…………..
A. Green light
B. Blue light
C. Yellow light
D. Red light
Answer:
D. Red light
Question 15.
Photosynthesis occurs at its best under-…………..
A. High oxygen concentration
B. Low carbon dioxide concentration
C. High carbon dioxide concentration under red light
D. Low oxygen concentration under green light
Answer:
C. High carbon dioxide concentration under red light
Question 16.
During photosynthesis, phosphorylation occurs in -…………..
A. Light-dependent phase
B. Light-independent phase
C. Both A. and 3.
D. None of these
Answer:
A. Light-dependent phase
Question 17.
One of the end products of light-dependent phase is -…………..
A. NADP
B. FAD
C. ADP
D. ATP
Answer:
D. ATP
Question 18.
Which of the following is called the Hill reagent?
A. NADP
B. ATP
C. NAD
D. FAD
Answer:
A. NADP
Question 19.
Reactions of light-dependent phase occur in-…………..
A. Stroma of chloroplast
B. Grana of chloroplast
C. Inner membrane of chloroplast
D. Mitochondrial matrix
Answer:
B. Grana of chloroplast
Question 20.
Fill in the blank with the correct option.
________ +Pi → ATP
A. AMP
B. ADP
C. NADP
D. NAD
Answer:
B. ADP
Question 21.
Fill in the blank with the correct option.
H2O → __________+oH–
A. H2
B. H
C. 2H
D. H+
Answer:
D. H+
Question 22.
Which of the following statements is correct?
A. Ionisation of water in photosynthesis needs no light.
B. Photophosphorylation is the only light-dependent reaction, taking place in photosynthesis.
C. Both hydrolysis and photophosphorylation involve chlorophyll.
D. Photophosphorylation needs chlorophyll but hydrolysis does not.
Answer:
C. Both hydrolysis and photophosphorylation involve chlorophyll.
Question 23.
Which of the following statements is incorrect?
A. ATP formation occurs during photosynthesis by photophosphorylation.
B. Hill reaction occurs in light-dependent phase of photosynthesis.
C. Carbon assimilation does not occur at all in presence of light.
D. Glucose formation is the last phase of photosynthesis.
Answer:
C. Carbon assimilation does not occur at all in presence of light.
Question 24.
The scientist who discovered the reaction pathway for the photolysis of water is-…………..
A. Robin Hill
B. M. Calvin
C. Blackman
D. C. Linnaeus
Answer:
A. Robin Hill
Question 25.
The first stable carbon compound produced during photosynthesis is -…………..
A. PGA
B. PGAld
C. Glucose
D. Starch
Answer:
A. PGA
Question 26.
What is the name of the following reaction?
A. Photophosphorylation
B. Photolysis of water
C. Carbon assimilation
D. Glucogenesis
Answer:
C. Carbon assimilation
Question 27.
Resynthesis of RuBP from PGA occurs during-…………..
A. Hill reaction
B. Glycolysis
C. Blackman reaction
D. Calvin cycle
Answer:
D. Calvin cycle
Question 28.
In photosynthesis, photolysis of water is popularly known as-…………..
A. Blackman reaction
B. Hill reaction
C. Z-scheme
D. None of these
Answer:
B. Hill reaction
Question 29.
Food synthesised during photosynthesis, is generally stored in plant tissue as-…………..
A. Glucose
B. Glycogen
C. Starch
D. Cellulose
Answer:
C. Starch
Question 30.
Which of the following is not a photosynthetic pigment?
A. Carotene
B. Phycobilin
C. Chlorophyll
D. Haemocyanin
Answer:
D. Haemocyanin
Question 31.
Photosynthesis is a-…………..
A. Chemical process
B. Mechanical process
C. Photochemical process
D. None of these
Answer:
C. Photochemical process
Question 32.
Out of the 7 colours of the visible spectrum, which two lights are the most effective for photosynthesis?
A. Red and blue
B. Green and red
C. Blue and green
D. Yellow and green
Answer:
A. Red and blue
Question 33.
The wavelength of red light of the visible spectrum ranges from-…………..
A. 430-470 nm
B. 650-760 nm
C. 580-650 nm
D. 480-570 nm
Answer:
B. 650-760 nm
Fill in the blanks
1. ………………. is the photosynthetic tissue of green plants.
2. Reactions of light-independent phase occur in ………………. of chloroplast.
3. Scientist ………………. proved that photosynthetic reactions occur in two phases.
4. …………….. is considered as the energy currency of the cells.
5. In plant cell, starch is stored in ……………..
6. Green plants absorb ……….. to synthesise glucose during photosynthesis.
7. …………….. is a cellular compound which reacts with atmospheric CO2 to produce phosphoglyceric acid.
8. …………….. is the enzyme which is necessary for the synthesis of PGA in the light independent phase.
Answer:
1. Chlorenchyma
2. Stroma
3. Blackman
4. ATP
5. Leucoplast
6. Carbon dioxide
7. RuBP
8. RuBisCO
State True or False
1. Aquatic plants absorb CO2 from water through root hair. — False
2. ATP stands for Adenosine Tri Phenol. — False
3. Blue-green algae like Nostoc, Anabaena etc. can synthesise their own food. — True
4. Ionisation of water is known as Blackman’s reaction. — False
5. NADP is an artificial Hill reagent. — False
6. Out of 12 PGAld molecules, only 2 take part in glucose synthesis. — True
7. RuBisCO is used in the light-dependent phase of photosynthesis. — False
8. Photosynthesis stops due to excessive heat from the sun. — True
9. Light-independent phase of photosynthesis is also known as Blackman’s reaction. — True
Match the columns
| Left column | Right column |
| 1. Light-dependent phase | A. ATP produced |
| 2. Light- independent phase | B. Fructose produced |
| 3. Photophosphorylation | C. PGA produced |
| 4. Carbon assimilation | D. O2, ATP, NADPH2 produced |
| E. Glucose produced |
Answer:
1-D; 2-E: 3-A; 4-C
| Left column | Right column |
| 1. Chlorophyll absent | A. Eugiena |
| 2. Highest rate of photosynthesis | B. Orchid |
| 3. Photosynthetic animal | C. Fungus |
| 4. Velamen present | D. Moss |
| E. Chlorella |
Answer:
1-C; 2-E; 3-A; 4-B