Plant Physiology — MCQs Biology

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1. Plant physiology deals with the study of:





2. Photosynthesis takes place mainly in the:





3. The green pigment involved in photosynthesis is:





4. Which gas is released during photosynthesis?





5. Which organelle is the site of photosynthesis?





6. The light reaction of photosynthesis occurs in:





7. The dark reaction of photosynthesis occurs in:





8. Which factor does NOT affect photosynthesis?





9. The process by which plants lose water vapour is called:





10. Transpiration mainly occurs through:





11. Opening and closing of stomata is regulated by:





12. Which factor increases transpiration rate?





13. Loss of water in liquid form from leaf margins is called:





14. Respiration in plants releases:





15. The site of cellular respiration is:





16. Which process releases energy in plants?





17. Which compound is the end product of photosynthesis?





18. Movement of water across a semi-permeable membrane is called:





19. Absorption of water by seeds is called:





20. Upward movement of water in plants occurs through:





21. The movement of food in plants is known as:





22. Food is transported in plants mainly as:





23. The tissue responsible for translocation of food is:





24. Which theory explains ascent of sap?





25. Which force helps in water absorption by roots?





26. Which element is a component of chlorophyll?





27. Which deficiency causes yellowing of leaves?





28. Wilting of plants occurs due to:





29. Which movement is growth-dependent?





30. Bending of stem towards light is called:





31. Growth of root towards gravity is:





32. Which plant hormone promotes cell elongation?





33. Which hormone promotes fruit ripening?





34. Which hormone delays leaf senescence?





35. Abscisic acid mainly acts as:





36. Opening of stomata during day is due to:





37. Which process requires energy?





38. Which element is essential for protein synthesis in plants?





39. Photorespiration occurs in:





40. Which enzyme fixes CO₂ in Calvin cycle?





41. Which movement is independent of growth direction?





42. Closing of stomata at night is due to:





43. Which process helps in cooling of plants?





44. Which mineral is required for opening of stomata?





45. Which hormone promotes stem elongation?





46. The main force for ascent of sap is:





47. Which plant movement is shown by Mimosa pudica?





48. Which process converts light energy into chemical energy?





49. Which factor increases respiration rate?





50. Which process is common to both plants and animals?





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