MCQOPTIONS
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MCQOPTIONS
This section includes 45 Mcqs, each offering curated multiple-choice questions to sharpen your Biology Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
About _______ % of photosynthesis is carried by terrestrial plants, while rest occurs in ocean, lakes, and ponds. |
| A. | 10% |
| B. | 20% |
| C. | 30% |
| D. | 40% |
| Answer» B. 20% | |
| 2. |
Air contains ______ % of CO2 |
| A. | 0.02-0.03 |
| B. | 0.03-0.04 |
| C. | 0.04-0.05 |
| D. | 0.05-0.06 |
| Answer» C. 0.04-0.05 | |
| 3. |
Bacteriochlorophylls does not include |
| A. | Chlorophyll e |
| B. | Chlorophyll d |
| C. | Chlorophyll a |
| D. | Chlorophyll c |
| Answer» D. Chlorophyll c | |
| 4. |
Breaking of terminal phosphate of ATP releases about _____ Kcal of energy. |
| A. | 6.1 |
| B. | 6.3 |
| C. | 7.1 |
| D. | 7.3 |
| Answer» E. | |
| 5. |
C6H12O6 + 6O2 ? 6CO2 + 6H20 + ENERGY represents: |
| A. | Photosynthesis |
| B. | Aerobic respiration |
| C. | Anaerobic respiration |
| D. | Respiration |
| Answer» C. Anaerobic respiration | |
| 6. |
Cellular respiration is essentially a/an _________ process. |
| A. | Oxidation. |
| B. | Reduction. |
| C. | Redox. |
| D. | None of the above. |
| Answer» B. Reduction. | |
| 7. |
Carotenoids perform protective function in |
| A. | Animals |
| B. | Plants |
| C. | Both of these |
| D. | None of these |
| Answer» D. None of these | |
| 8. |
Chlorophyll is insoluble in: |
| A. | Carbon tetrachloride |
| B. | Alcohol |
| C. | Organic solvents |
| D. | Water |
| Answer» E. | |
| 9. |
Chlorophylls are found embedded in the ______ membranes |
| A. | Stroma |
| B. | Grana |
| C. | Thylakoid |
| D. | Intergrana |
| Answer» D. Intergrana | |
| 10. |
Reduction in photosynthesis is of |
| A. | O2 |
| B. | CO2 |
| C. | H2O |
| D. | Light energy |
| Answer» C. H2O | |
| 11. |
Stomata cover only _________ of leaf surface. |
| A. | 0.03 - 0.04% |
| B. | 10% |
| C. | 1-2 % |
| D. | 50% |
| Answer» D. 50% | |
| 12. |
The chlorophyll molecule is embedded in the core of thylakoid membrane which acts as |
| A. | Hydrophilic |
| B. | Hydrophobic |
| C. | Both of these |
| D. | None of these |
| Answer» C. Both of these | |
| 13. |
The dense fluid filled region in the chloroplast is |
| A. | Grana |
| B. | Stroma |
| C. | Thylakoid |
| D. | None of these |
| Answer» C. Thylakoid | |
| 14. |
The first action spectrum was obtained by |
| A. | T.W.Englemam |
| B. | Malleus |
| C. | T.W.Inws |
| D. | W.Stapes |
| Answer» B. Malleus | |
| 15. |
The most important photosynthetic pigment |
| A. | Chlorophyll a |
| B. | Chlorophyll b |
| C. | Xanthophyll |
| D. | Carotenes |
| Answer» B. Chlorophyll b | |
| 16. |
The organisms able to use sunlight directly as a source of energy are |
| A. | Plants |
| B. | Animals |
| C. | Omnivores |
| D. | Fungi |
| Answer» B. Animals | |
| 17. |
The percentage of light absorbed by the leaf |
| A. | 20% |
| B. | 15% |
| C. | 10% |
| D. | 1% |
| Answer» E. | |
| 18. |
The point at which there is no net exchange of gases between leaves and atmosphere is known as |
| A. | Neutral point |
| B. | Compensation point |
| C. | Parallel point |
| D. | Competitive point |
| Answer» C. Parallel point | |
| 19. |
Thylakoids in chloroplasts are stacked into |
| A. | Grana |
| B. | Stroma |
| C. | Nucleus |
| D. | None of these |
| Answer» B. Stroma | |
| 20. |
Van neil hypothesis about the production of oxygen during phosynthesis was based on the study and investigations on |
| A. | Bacteria |
| B. | Algae |
| C. | Protenema |
| D. | Cyanobacteria |
| Answer» B. Algae | |
| 21. |
Visible light used in photosynthesis ranges from: |
| A. | 300 - 700 nm in wavelength |
| B. | 350 - 750 nm in wavelength |
| C. | 380 - 750 nm in wavelength |
| D. | 390 - 790 nm in wavelength. |
| Answer» D. 390 - 790 nm in wavelength. | |
| 22. |
Which is the correct order of energy transfer from assessory pigments to main photosynthetic pigment? |
| A. | Carotenoids ? Chlorophyll a ? Chlorophyll b. |
| B. | Chlorophyll b ? Carotenoids ? Chlorophyll a. |
| C. | Carotenoids ? Chlorophyll b ? Chlorophyll a. |
| D. | Chlorophyll a ? Chlorophyll b ? Carotenoids. |
| Answer» D. Chlorophyll a ? Chlorophyll b ? Carotenoids. | |
| 23. |
Which of the following light is least absorbed by the plants: |
| A. | Orange |
| B. | Red |
| C. | Blue |
| D. | Green |
| Answer» E. | |
| 24. |
Which of the following statement about the head of a chlorophyll molecule is incorrect: |
| A. | It is a porphyrin ring or tetrapyrrole ring structure |
| B. | It is flat, square and light absorbing |
| C. | Composed of carbon and nitrogen atoms with Magnesium as central metal ion, which is coordinated with nitrogen. |
| D. | It is hydrophobic |
| Answer» E. | |
| 25. |
Which of the following pigment is Blue- green in colour: |
| A. | Chlorophyll a |
| B. | Chlorophyll b. |
| C. | Chlorophyll c |
| D. | Chlorophyll d. |
| Answer» B. Chlorophyll b. | |
| 26. |
Which of the light is mainly absorbed by the plants: |
| A. | Orange |
| B. | Red |
| C. | Green |
| D. | Both A and B |
| Answer» E. | |
| 27. |
Xanthophylls are ______ pigments |
| A. | Yellow |
| B. | Red |
| C. | Orange |
| D. | Green |
| Answer» B. Red | |
| 28. |
In alcoholic fermentation Pyruvic acid is broken down into: |
| A. | Acetaldehyde |
| B. | Methyl alcohol |
| C. | Ethyl alcohol. |
| D. | Lactic acid. |
| Answer» D. Lactic acid. | |
| 29. |
In all plants the major sites of phosynthesis are |
| A. | Leaves respire and utilize O2 and release CO2. |
| B. | Stems |
| C. | Roots |
| D. | Branches |
| Answer» B. Stems | |
| 30. |
In Anaerobic respiration only _____ % of the energy present within the chemical bond of glucose is converted into ATP. |
| A. | 1% |
| B. | 2% |
| C. | 3% |
| D. | 4% |
| Answer» C. 3% | |
| 31. |
In which of the following component of the body, lactic acid fermentation takes place: |
| A. | Brain. |
| B. | Heart |
| C. | Liver. |
| D. | Muscles |
| Answer» E. | |
| 32. |
Light reaction takes place on/in |
| A. | Thylakoid |
| B. | Storma |
| C. | Chloroplast |
| D. | Grana |
| Answer» E. | |
| 33. |
Molecular formula of chlorophyll b is |
| A. | C55 H10 O4 N6 Mg |
| B. | C55 H70 O6 N5 Mg |
| C. | C55 H71 O6 N4 Mg |
| D. | C55 H70 O6 N4 Mg |
| Answer» C. C55 H71 O6 N4 Mg | |
| 34. |
NADPH2 provides |
| A. | Assimilatory power |
| B. | Chemical energy |
| C. | Energized electrons |
| D. | All of these |
| Answer» E. | |
| 35. |
Net yield of H2O in Photosynthesis is |
| A. | 1 molecule |
| B. | 6 molecules |
| C. | 3 molecules |
| D. | 0 molecule |
| Answer» E. | |
| 36. |
Of the following, which one causes higher production of food in green plants |
| A. | Blue |
| B. | Orange |
| C. | Red |
| D. | Violet |
| Answer» D. Violet | |
| 37. |
Of the following, which one light gathering |
| A. | Antenna complex |
| B. | Reaction centre |
| C. | Photosystem |
| D. | None of these |
| Answer» B. Reaction centre | |
| 38. |
Photosystem II has molecules which absorbs maximum light of |
| A. | 680 nm |
| B. | 100 m |
| C. | 700 nm |
| D. | 670 nm |
| Answer» B. 100 m | |
| 39. |
Photosynthesis carried out by terrestrial plants is ____ of total photosynthesis. |
| A. | 1-2% |
| B. | 5% |
| C. | 10% |
| D. | 20% |
| Answer» D. 20% | |
| 40. |
PS I has chlorophyll a molecule which absorbs maximum light of _____ nm. |
| A. | 600 |
| B. | 650 |
| C. | 680 |
| D. | 700 |
| Answer» E. | |
| 41. |
Chlorophylls mainly absorb ____ wavelengths |
| A. | Orange - blue |
| B. | Violet - red |
| C. | Yellow - orange |
| D. | Orange - red. |
| Answer» E. | |
| 42. |
Complete breakdown of glucose molecule takes place in which of the following: |
| A. | Alcoholic fermentation |
| B. | Lactic acid fermentation |
| C. | Aerobic respiration. |
| D. | All of these |
| Answer» D. All of these | |
| 43. |
Deficiency of ________ causes yellowing in plants |
| A. | Magnesium |
| B. | Iron |
| C. | Chlorine |
| D. | Oxygen |
| Answer» B. Iron | |
| 44. |
Final acceptor of electrons in respiratory chain is |
| A. | NADH |
| B. | Cytochrome a3 |
| C. | Water |
| D. | Oxygen |
| Answer» E. | |
| 45. |
First Actions spectrum was obtained by using |
| A. | Algae |
| B. | Fungi |
| C. | Bacteria |
| D. | Spirogyra |
| Answer» E. | |