1. The physical process involved in the release of molecular oxygen from leaves is A. diffusion B. transpiration C. osmosis D. capillarity Ans: A
2. If a cell swells, after being placed in solution, the solution is A. neutral B. hypotonic C. hypertonic D. isotonic Ans: B
3. Chlorophyll is present A. in the grana of chloroplasts B. on the surface of chloroplasts C. dispersed through out the chloroplasts D. in the stroma of chloroplasts Ans: A
4. Translocation of carbohydrate nutrients usually occurs in the form of A. glucose B. maltose C. starch D. sucrose Ans: D
5. Hydroponics is a technique in which plants are grown in A. green house B. water saturated sand C. balanced nutrient solution D. purified distilled water Ans: C
6. Respiration in plants A. occurs only during day B. results in the formation of vitamins C. is characteristic of all living cells D. often requires CO₂ Ans: C
7. Chief function of leaves are A. transpiration and photosynthesis B. respiration and photosynthesis C. respiration and digestion D. respiration and transpiration Ans: A
8. Which element is required in comparatively least quantity for the growth of plant? A. Zn B. N C. P D. Ca Ans: A
9. End product of glycolysis is A. acetyl CoA B. pyruvic acid C. glucose-1-phosphate D. fructose-1-phosphate Ans: B
10. The ultimate gain of light reaction is A. ATP and NADPH₂ B. NADPH₂ C. only ATP D. only O₂ Ans: A
11. End product of fermentation of sugars is A. H2_O and CO₂ B. CO₂ C. alcohol and CO₂ D. alcohol Ans: C
12. Stomata open and close due to A. circadian rhythm B. genetic clock C. pressure of gases inside the leaves D. turgor pressure of guard cells Ans: D
13. Which of the following plant is found to have minimum transpiration ? A. Cactus B. Hydrilla C. Mango D. Guava Ans: A
14. Photosynthetically active radiation is represented by the range of wavelength of A. 340 – 450 nm B. 400 – 700 nm C. 500 – 600 nm D. 400 – 950 nm Ans: B
15. Which of the following is not performed by root hairs ? A. Water uptake B. Oxygen uptake C. Mineral uptake D. CO₂ uptake Ans: D
16. In rainy season, door gets swelled due to A. imbibition B. diffusion C. transpiration D. respiration Ans: A
17. The force responsible for upward conduction of water against gravity comes from A. transpiration B. translocation C. respiration D. photosynthesis Ans: A
18. Double fertilization means A. fusion of male gametes and ovum B. fusion of two polar bodies C. a male gamete fused with egg and second male gamete fused with secondary nucleus D. all the above Ans: C
19. Which of the following is not caused by deficiency of mineral nutrition? A. Necrosis B. Chlorosis C. Etiolation D. Shortening of internodes Ans: C
20. Generally plants absorbed N2 in the form of A. [latex]NO_{2}^-[/latex] B. [latex]NO_{3}^-[/latex] C. N [latex]\equiv N[/latex] D. HNO₂ Ans: B
21. Which of the following element is a constituent of protein ? A. Sulphur B. Potassium C. Lead D. Phosphorus Ans: A
22. Haploid, diploid and triploid conditions respectively can be traced in A. egg, nucellus, endosperm B. antipodal, egg, endosperm C. endosperm, nucellus, synergids D. antipodal, synergids and integuments Ans: A
23. [latex]N_{2} + 8e^- +8H^+ + 16ATP ----> 2NH_{4} + H_{2} + 16ADP + 16Pi[/latex] The above equation refers to A. ammonification B. nitrification C. nitrogen fixation D. denitrification Ans: C
24. In PS-I the reaction centre Chl a has absorption maxima at _____________, while in PS-II the reaction centre Chl a has absorption maxima at ___________. A. P₆₈₀, P₇₀₀ B. P₇₀₀, P₆₈₀ C. P₈₀₀, P₆₀₀ D. P₇₀₀, P₉₀₀ Ans: B
25. Ethylene gas is used for A. growth of plants. B. delaying fruit’s abscission. C. ripening of fruits. D. stopping the leaf abscission Ans: C
26. Which one is the correct summary equation of photosynthesis? Ans: D
27. Which one of the following is primarily concerned with cell division ? A. GA₃ B. IAA C. Cytokinin D. Ethylene Ans: C
28. Growth is primarily affected by two climatic factors which are – A. Light and temperature B. Temperature and relative humidity C. Light and wind D. Rainfall and temperature Ans: A
29. The hormone reducing transpiration rate by inducing stomatal closure is A. ABA B. ethylene C. cytokinin D. auxin Ans: A
30. Which part of the plant do not perform photosynthesis? A. Cactus stem B. Guard cell of stomata C. Mesophyll cells of leaf D. Leaf epidermis Ans: D
31. Effect of low temperature which shortens vegetative period and hasten flowering is A. photoperiodism B. transpiration C. vernalization D. photolysis Ans: C
32. Which of the following elements is not required by plants for their normal healthy growth? A. Calcium B. Magnesium C. Lead D. Iron Ans: C
33. The hormone responsible for phototropism is A. Ethylene B. Abscisic acid C. Auxin D. Gibberellic acid Ans: C
34. In which part of a flower do both meiosis and fertilization occur? A. Ovule B. Stigma C. Anther D. Petal Ans: A
35. Bidirectional translocation of minerals takes place in A. Xylem B. Phloem C. Parenchyma D. Cambium Ans: B
36. Soil can easily become deficient in____________ because these ions are negatively charged and do not stick to negatively charged clay particles. A. Nitrate B. Calcium C. Ammonium D. Magnesium Ans: A
37. In an anaerobic condition, yeast cells breakdown glucose to A. CO₂ + H₂O B. C₂H₅OH and CO₂ C. CO₂ + Lactic acid D. CO₂ + Pyruvic acid Ans: B
38. Two pigment system theory of photosynthesis was proposed by or Concept of evidence for existence of two photosystems in photosynthesis was given by A. Hill B. Blackman C. Emerson D. Arnon Ans: C
39. Which mineral nutrients are called critical element for crops? A. N, P, K B. C, H, O C. N, S, Mg D. K, Ca, Fe Ans: A
40. Which of the following would not have an effect on flowering of a particular plant species? A. Plant age B. Nutritional status C. Temperature D. Prevailing wind Ans: D