Plant Physiology MCQs-10

Plant Physiology MCQs-10
Multiple Choice Questions (MCQs)
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1. Cactus plants and other succulents open their stomata primarily at night rather than during the day to ________

 Maximize the absorption of intense sunlight for photosynthesis

 Release water vapor to cool the plant surface in cooler temperatures

 Facilitate the movement of pollinators that are active after dark

 Minimize water loss while still allowing for the uptake of carbon dioxide

2. Recent studies on plant thermotolerance indicate that the ___________  family of heat shock proteins plays a central role in maintaining gene expression during the recovery phase after heat stress, thereby contributing to hea-stress memory

 Small heat shock proteins (sHSPs)

 HSP90

 HSP100/Clp

 HSP70

3. Under combined drought and heat stress, which hormone suppresses auxin-driven thermomorphogenic growth to prioritize water conservation?

 Jasmonic acid

 Ethylene

 Salicylic acid

 Abscisic acid

4. Which root adaptation helps plants survive drought?

 No roots

 Deep roots reaching groundwater

 Weak root system

 Shallow, surface roots

5. Guttation is the process by which plants lose water in the form of liquid droplets from _______

 Stomata during the daytime

 Entire leaf surface through the cuticle

 Lenticels on the stem

 Specialized pores called hydathodes

6. Heat Shock Proteins (HSPs) in Plants are primarily classified based on which characteristic?

 Amino acid composition

 Molecular weight

 Species origin

 Subcellular location only

7. Under which of the following environmental conditions would the transpiration rate in a well-watered plant typically be the highest?

 Cool temperatures and high atmospheric pressure

 High temperature, high wind speed, and low humidity

 High atmospheric humidity and still air

 Saturated soil and low light intensity

8. In plant science, water potential (Ψ) is most commonly expressed in which of the following units to describe the movement of water between cells and the environment?

 Megapascals (MPa)

 Newtons (N)

 Watts (W)

 Joules (J)

9. Heat stress during rice grain filling primarily reduces grain weight by impairing ________

 Lipid metabolism

 Cell wall synthesis

 Protein synthesis

 Starch accumulation

10. Which thermosensory protein acts as a molecular thermometer by converting between active (Pfr) and inactive (Pr) conformations?

 ELF3

 Phytochrome B

 PIF4

 HSF1

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Plant Physiology MCQs-10

Plant Physiology MCQs

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Multiple Choice Questions (MCQs) for Professional Test Preparation

Use of Multiple-choice questions (MCQs) is among the proven strategies to test your knowledge and improve your skills for relevant exams. These Expert-Approved MCQs cover various aspects of the fundamentals of agriculture, crop plants, production technologies, dietary and nutritional importance and industrial processes. Moreover, key questions about soil, irrigation, pests, diseases and other aspects of crop management are also included. Return to [MCQ Homepage]

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Plant Physiology MCQs

Plant physiology is the branch of botany focused on how plants function at cellular, biochemical, and organismal levels. It investigates crucial processes—photosynthesis, nutrient uptake, respiration, hormone action, and water transport—essential for plant growth, development, and environmental adaptation.

Key areas within the study of plant physiology include

1. Photosynthesis
2. Respiration
3. Transpiration
4. Water and mineral uptake
5. Transport (xylem and phloem)
6. Growth and development
7. Hormonal regulation
8. Nutrient assimilation
9. Stress physiology
10. Reproductive physiology

Photosynthesis: Plants capture light energy to convert carbon dioxide and water into glucose for energy.
Water and Nutrient Transport: The xylem moves water upward from roots, while phloem transports nutrients throughout the plant.
Growth and Development: Study of how phytohormones regulate growth, seed germination, and response to environmental stressors like heat or drought.
Environmental Physiology: Understanding how plants adapt to their environment, such as managing water loss through stomatal closing

Plant Physiology MCQs-10

, Photosynthesis MCQs, Nutrient Uptake MCQs, Transpiration and Respiration MCQs, Plant Growth Regulators