Plant Physiology MCQs-17

Plant Physiology MCQs-17
Multiple Choice Questions (MCQs)
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1. During seed germination, the mobilization of stored energy reserves is essential for seedling growth. The enzyme responsible for hydrolyzing starch into maltose (a disaccharide) in the endosperm or cotyledons is ______________

 α-Amylase

 Protease

 Catalase

 Lipase

2. The movement of water through plant tissues primarily occurs due to a _______

 Water potential gradient

 Soil color

 Temperature only

 Leaf shape

3. Xerophytic plants reduce water loss primarily through which structural adaptation?

 Thick cuticle and reduced density of stomata

 Increased leaf area

 Large stomatal openings

 Increased transpiration

4. Stomatal opening is primarily triggered by the accumulation of which ions in guard cells?

 Iron ions

 Potassium ions

 Calcium ions

 Sodium ions

5. The metabolic pathway responsible for oxidation of fatty acids released from stored lipids during germination is _________

 Photorespiration

 Calvin cycle

 Glycolysis

 β-oxidation

6. The plant hormone abscisic acid (ABA) regulates transpiration primarily by________

 Inducing stomatal closure

 Increasing photosynthesis

 Enhancing respiration

 Increasing stomatal opening

7. High temperature combined with dry atmospheric conditions generally results in _________

 Reduced evaporation

 Increased transpiration

 Reduced transpiration

 Reduced water movement

8. In the C₄ photosynthetic pathway, CO₂ is initially fixed in mesophyll cells into which compound?

 Oxaloacetate

 Ribulose

 Malate

 Pyruvate

9. The pressure–flow hypothesis (Münch hypothesis) explains the mechanism of_________

 Respiration

 Phloem transport

 Xylem transport

 Transpiration

10. What is the primary role of carotenoids in the photosynthetic apparatus?

 Produce ATP

 Fix carbon dioxide

 Split water molecules

 Protect chlorophyll from photooxidation

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Plant Physiology MCQs-17

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