MCQOPTIONS
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MCQOPTIONS
This section includes 37 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following inhibits \[{{O}_{2}}\] release in light phase [DPMT 2004] |
| A. | PMA |
| B. | Zeatin |
| C. | DCMU |
| D. | None of these |
| Answer» D. None of these | |
| 2. |
The most effective wavelength of visible light in photosynthesis is in the region of [AFMC 1989, 2003; MP PMT 1989, 2000; CPMT 1990, 2000; DPMT 1986, 87, 2004; CBSE PMT 1999; RPMT 1999; Kerala CET 2003] |
| A. | Violet |
| B. | Green |
| C. | Yellow |
| D. | Red |
| Answer» E. | |
| 3. |
Emmerson defined 'red drop' as a decline in photosynthesis also termed Emmerson's effect. It appears at |
| A. | 460 nm wavelength |
| B. | 630 nm wavelength |
| C. | 680 nm wavelength |
| D. | 680 nm wavelength |
| Answer» E. | |
| 4. |
Under conditions of constant illumination, the compensation period for a whole aquarium would be of infinite length when |
| A. | The biomass of animals equals the biomass of plants |
| B. | The respiratory exchanges of the animals are equal to the photosynthetic exchanges of the plants |
| C. | The oxygen intake of the animals equals of oxygen output of photosynthesis |
| D. | The carbon dioxide output of the animals and plants equals to the photosynthetic intake of the plants |
| Answer» E. | |
| 5. |
If water supply to the plant is extremely meagre to as to cause wilting of leaves, the rate of photosynthesis may |
| A. | Increase |
| B. | Decrease |
| C. | First increase than decrease |
| D. | First decrease than increase |
| Answer» C. First increase than decrease | |
| 6. |
Warburg studied his effect on |
| A. | Chlamydomonas |
| B. | Chlorella |
| C. | Volvox |
| D. | All the above |
| Answer» C. Volvox | |
| 7. |
What plant is used in an experiment commonly performed in laboratory in demonstrate evolution of oxygen in photosynthesis [RPMT 1997] |
| A. | Sunflower |
| B. | Hydrilla |
| C. | Croton |
| D. | Balsam |
| Answer» C. Croton | |
| 8. |
The thylakoids are removed and kept in a culture medium containing\[C{{O}_{2}}\]and\[{{H}_{2}}O\]. If the setup is exposed to light, hexose sugars are not formed as the end product. The most appropriate reason for this will be that [AIIMS 1980, 85] |
| A. | Carbon assimilation cannot take place |
| B. | The pigments (P-700 and P-680) are not linked |
| C. | Enzymes are not available |
| D. | The light trapping device is not functional |
| Answer» D. The light trapping device is not functional | |
| 9. |
The path of\[C{{O}_{2}}\]in the dark reaction of photosynthesis was successfully traced by the use of the following or The dark reaction is traced by [CPMT 1990; MP PMT 1987; BHU 1992] |
| A. | \[{{O}_{2}}^{18}\] |
| B. | \[{{C}^{14}}{{O}_{2}}\] |
| C. | \[{{p}^{36}}\] |
| D. | X-rays |
| Answer» C. \[{{p}^{36}}\] | |
| 10. |
Sedohaptulose is a carbohydrate having |
| A. | 3 carbon atoms |
| B. | 2 carbon atoms |
| C. | 4 carbon atoms |
| D. | 7 carbon atoms |
| Answer» E. | |
| 11. |
Radioactive\[{{C}^{14}}\]is given to\[C{{O}_{2}}\]and released to atmosphere. This\[C{{O}_{2}}\]is taken by RuBP in a\[{{C}_{3}}\]plant. First radioactive\[{{C}^{14}}\]is seen in which compound [Manipal 2005] |
| A. | PGAL |
| B. | PEP |
| C. | RMP |
| D. | PGA |
| Answer» E. | |
| 12. |
The first step in dark reaction of photosynthesis is [CPMT 2004] |
| A. | Formation of ATP |
| B. | Ionization of water |
| C. | Attachment of \[C{{O}_{2}}\] to a pentose sugar |
| D. | Excitement of electron of chlorophyll by a photon of light |
| Answer» D. Excitement of electron of chlorophyll by a photon of light | |
| 13. |
Carbon dioxide is fixed in [MP PMT 1999] |
| A. | Light reaction |
| B. | Dark reaction |
| C. | Aerobic respiration |
| D. | Anaerobic respiration |
| Answer» C. Aerobic respiration | |
| 14. |
Dark reaction of photosynthesis take place in [CPMT 1986, 90; RPMT 1995; MP PMT 2000] |
| A. | Grana |
| B. | Stroma |
| C. | Matrix |
| D. | Cytoplasm |
| Answer» C. Matrix | |
| 15. |
In\[{{C}_{4}}\]plants,\[C{{O}_{2}}\]combine with PEP in presence of [CPMT 1990] |
| A. | PEP carboxylase |
| B. | RuBP carboxylase |
| C. | RuBP oxygenase |
| D. | Hydrogenase |
| Answer» B. RuBP carboxylase | |
| 16. |
Which of the following may show photosynthesis in moonlight |
| A. | Some thermal algae |
| B. | Some marine algae |
| C. | Some fresh water algae |
| D. | None of the above |
| Answer» C. Some fresh water algae | |
| 17. |
Photosynthesis will proceed upto |
| A. | Limit of light |
| B. | Limit of wind |
| C. | Limit of moisture |
| D. | None of the above |
| Answer» B. Limit of wind | |
| 18. |
Bacteriochlorophyll differs from chlorophyll 'a' in having [CPMT 1989] |
| A. | One pyrrol ring with one hydrogen |
| B. | One pyrrol ring with two hydrogen |
| C. | One pyrrol ring with three hydrogen |
| D. | One pyrrol ring with four hydrogen |
| Answer» C. One pyrrol ring with three hydrogen | |
| 19. |
Photosynthesis consists of essentially two biological reaction systems, one followed by the other, the second of these systems does which of the following [CPMT 1988] |
| A. | Fixes\[C{{O}_{2}}\] |
| B. | Traps light energy |
| C. | Synthesizes starch |
| D. | Works only in the presence of light |
| Answer» B. Traps light energy | |
| 20. |
Chlorophyll 'a' is found in [CBSE PMT 1992] |
| A. | All oxygen releasing photosynthetic forms |
| B. | All plants except fungi |
| C. | All higher plants that photosynthesize |
| D. | All photosynthetic prokaryotes and eukaryotes |
| Answer» B. All plants except fungi | |
| 21. |
Which of the plants can show CAM cycle |
| A. | Members of graminae |
| B. | Members of cactaceae |
| C. | Members of chenopodiaceae |
| D. | All the above |
| Answer» C. Members of chenopodiaceae | |
| 22. |
No. of carboxylation in \[{{C}_{4}}\]cycle is/are [DPMT 2003] |
| A. | 1 |
| B. | 2 |
| C. | 5 |
| D. | 3 |
| Answer» C. 5 | |
| 23. |
How many types of photosynthetic cells occur in\[{{C}_{4}}\]plant |
| A. | One type |
| B. | Two types |
| C. | Four types |
| D. | Eight types |
| Answer» C. Four types | |
| 24. |
CAM photosynthesis occurs in plants with [MP PMT 1993] |
| A. | Thin green leaves with reticulate venation |
| B. | Thin green leaves with parallel venation |
| C. | Fleshy green leaves |
| D. | Thin coloured leaves |
| Answer» D. Thin coloured leaves | |
| 25. |
Which of the following is essential for the normal growth of \[{{C}_{4}}\] plants |
| A. | Silicon (100 m) |
| B. | Vanadium\[(100\mu m)\] |
| C. | Sodium (100 m) |
| D. | Barium (100 m) |
| Answer» D. Barium (100 m) | |
| 26. |
Atriplex spongiosa is a |
| A. | \[{{C}_{3}}\]plant |
| B. | \[{{C}_{4}}\]plant |
| C. | CAM plant |
| D. | All the above |
| Answer» C. CAM plant | |
| 27. |
Which of the following is a CAM plant |
| A. | Maize |
| B. | Sugarcane |
| C. | Agave |
| D. | Mango |
| Answer» D. Mango | |
| 28. |
Which of the following is \[C{{O}_{2}}\] acceptor in \[{{C}_{4}}\] plants [CPMT 1986,2004; AMU 1987; CBSE PMT 1990; BHU 1994, 2000; MP PMT 1996; CPMT 1998; Orissa PMT 2002; BVP 2002] |
| A. | Phosphoenol pyruvate (PEP) |
| B. | Ribulose 1, 5 diphosphate (RuDP) |
| C. | Oxaloacetic acid (OAA) |
| D. | Phosphoglyceric acid (PGA) |
| Answer» B. Ribulose 1, 5 diphosphate (RuDP) | |
| 29. |
Which one is a\[{{C}_{4}}\]plant [BHU 1979, 82; DPMT 1984; CBSE PMT 1988; MP PMT 1993, 95] |
| A. | Papaya |
| B. | Pea |
| C. | Potato |
| D. | Maize |
| Answer» E. | |
| 30. |
Green bacteria contains |
| A. | Chlorobium chlorophyll-660 |
| B. | Chlorobium chlorophyll-650 |
| C. | Both [a] and [b] |
| D. | Chlorobium chlorophyll-700 |
| Answer» D. Chlorobium chlorophyll-700 | |
| 31. |
Photosynthetic pigments in bacteria are located in [Wardha 2005] |
| A. | Thylakoid mambrane |
| B. | Cytoplasm |
| C. | Chloroplast membrane |
| D. | Ribosomes |
| Answer» B. Cytoplasm | |
| 32. |
What is the bye-product of bacterial photosynthesis |
| A. | \[{{O}_{2}}\] |
| B. | \[{{H}_{2}}O\] |
| C. | \[S\] |
| D. | \[{{H}_{2}}S\] |
| Answer» D. \[{{H}_{2}}S\] | |
| 33. |
Assertion : CAM plants lack structural compartmentation of leaf, as found in\[{{C}_{4}}\]plants. Reason : Stomata of CAM plants are open during the day. |
| A. | If both the assertion and the reason are true and the reason is a correct explanation of the assertion |
| B. | If both the assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | If the assertion is true but the reason is false |
| D. | If both the assertion and reason are false |
| E. | If the assertion is false but reason is true |
| Answer» D. If both the assertion and reason are false | |
| 34. |
Assertion : Photorespiration is completed in three cell organelles. Reason : Peroxisomes, glyoxysomes and desmosomes are involved in photorespiration. |
| A. | If both the assertion and the reason are true and the reason is a correct explanation of the assertion |
| B. | If both the assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | If the assertion is true but the reason is false |
| D. | If both the assertion and reason are false |
| E. | If the assertion is false but reason is true |
| Answer» D. If both the assertion and reason are false | |
| 35. |
Assertion : Six molecules of\[C{{O}_{2}}\] and twelve molecules of \[NADP{{H}^{+}}+{{H}^{+}}\]and 18 ATP are used to form one hexose molecule. Reason : Light reaction results in formation of \[ATP\]and \[NADP{{H}_{2}}\] [AIIMS 2002] |
| A. | If both the assertion and the reason are true and the reason is a correct explanation of the assertion |
| B. | If both the assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | If the assertion is true but the reason is false |
| D. | If both the assertion and reason are false |
| E. | If the assertion is false but reason is true |
| Answer» C. If the assertion is true but the reason is false | |
| 36. |
Assertion : Sciophytes require higher light intensity than heliophytes. Reason : Sciophytes grow below the canopy of trees. |
| A. | If both the assertion and the reason are true and the reason is a correct explanation of the assertion |
| B. | If both the assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | If the assertion is true but the reason is false |
| D. | If both the assertion and reason are false |
| E. | If the assertion is false but reason is true |
| Answer» F. | |
| 37. |
Assertion : Oxidative phosphorylation requires oxygen. Reason : Oxidative photophosphorylation occurs in mitochondria. |
| A. | If both the assertion and the reason are true and the reason is a correct explanation of the assertion |
| B. | If both the assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | If the assertion is true but the reason is false |
| D. | If both the assertion and reason are false |
| E. | If the assertion is false but reason is true |
| Answer» C. If the assertion is true but the reason is false | |