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Plant Physiology Questions

Practice 118 Plant Physiology questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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118
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47
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66
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5
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Practice by Exam:Biology(102)Mathematics and Science(7)General Awareness(3)General Science(2)Science(2)General Science@NUM: 29(1)General Studies(1)

About Plant Physiology — practice questions, PYQs & concepts

Plant Physiology is a frequently-tested topic on Biology, Mathematics and Science, General Awareness. ExamTest.live currently lists 118 Plant Physiology questions spanning previous-year papers from 2017 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

Plant Physiology weight in competitive exams

Across our Plant Physiology question bank, the largest sources are Biology (102), Mathematics and Science (7), General Awareness (3), General Science (2) and Science (2). Click any exam chip above to drill down to that exam-specific question set.

How to use this page

  • Start easy: 47 easy Plant Physiology questions are available — build fluency before moving up.
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All Plant Physiology Questions(1–100 of 118)

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Q1mediummcqGeneral ScienceSSC GD2026
0% accuracy
Photosynthesis in plants converts light energy to ______ energy.
Q2mediummcqGeneral AwarenessSSC Selection Post 2018 Higher Secondary Level2026
50% accuracy
हरे रंगरं के पौ धों द्वा रा प्रका श ऊर्जा को रा सा यनि क ऊर्जा में परि वर्ति त करने के लि ए उपयो ग की जा ने वा ली भौ ति क-रा सा यनि क प्रक्रि या को _________ के रूप में जा ना जा ता है।
Q3easymcqBiologyNEET 20192026
0% accuracy
Respiratory Quotient (RQ) value of tripalmitin is:
Q4mediummcqBiologyNEET (UG) 20172026
0% accuracy
Which of the following facilitates opening of stomatal aperture?
Q5easymcqBiologyNEET 20192026
0% accuracy
Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalyzed by:
Q6mediummcqGeneral AwarenessSSC Selection Post 2021 Question Paper (09-Feb-2022) (Shift-1)2026
0% accuracy
During the process of respiration in plants, which of the following is NOT released as a product?
Q7easymcqBiologyNEET 20192026
0% accuracy
It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?
Q8easymcqBiologyNEET 20192026
0% accuracy
Xylem translocates:
Q9easymcqBiologyNEET (UG) 20172026
0% accuracy
Fruit and leaf drop at early stages can be prevented by the application of:
Q10mediummcqBiologyCompetitive Exam Practice Paper2026
100% accuracy
A short day plant has a critical day length of 14 hours. It will flower when the day length is
Q11mediummcqBiologyNEET 20192026
0% accuracy
What is the direction of movement of sugars in phloem?
Q12mediummcqBiologyIndian Competitive Exam Prep2026
0% accuracy
How does a non-green (colored) leaf synthesize food?
Q13easymcqBiologyNEET 20192026
0% accuracy
Thiobacillus is a group of bacteria helpful in carrying out:
Q14easymcqBiologyNEET 20192026
0% accuracy
What is the site of perception of photoperiod necessary for induction of flowering in plants?
Q15mediummcqBiologySSC CGL2026
100% accuracy
Which of the following statements is NOT applicable in the case of photosynthesis?
Q16easymcqBiologyNEET (UG) 20172026
0% accuracy
The water potential of pure water is:
Q17mediummcqGeneral StudiesCompetitive Exam2026
0% accuracy
Which metal is present in chlorophyll?
Q18mediummcqBiologyCompetitive Examination2026
0% accuracy
Which of the following is a primary growth-inhibiting hormone in plants?
Q19mediummcqBiologyGeneral Knowledge2026
0% accuracy
The most abundant enzyme in the living world is _________.
Q20mediummcqScienceCompetitive Exam Mock2026
0% accuracy
Water available for plants within the soil is
Q21easymcqBiologyNEET 20172026
The water potential of pure water is:
Q22easymcqBiologyNEET (UG) 20182026
Oxygen is not produced during photosynthesis by:
Q23easymcqBiologyNEET 20172026
Fruit and leaf drop at early stages can be prevented by the application of:
Q24mediummcqScienceSSC CGL2026
Which of these is not a macronutrient for Plants?
Q25easymcqBiologyNEET (UG) 20182026
In which of the following forms is iron absorbed by plants?
Q26mediummcqBiologyNEET (UG) 20182026
Stomatal movement is not affected by:
Q27mediummcqBiologyNEET 20172026
Which of the following facilitates opening of stomatal aperture?
Q28easymcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2026
Which equation shows the balanced reaction of Photosynthesis ?
Q29mediummcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2026
Which one of the following plants keep its stomata open during the night and close during the day ?
Q30mediummcqBiologyNEET 2020 E12026
The process of growth is maximum during:
Q31mediummcqBiologyNEET 20212026
Match List-I with List-II:
image
Q32easymcqBiologyNEET (UG) 20182026
Which of the following elements is responsible for maintaining turgor in cells?
Q33easymcqBiologyNEET 20222026
Which one of the following produces nitrogen fixing nodules on the roots of Alnus?
Q34easymcqBiologyNEET 20172026
Phosphoenol pyruvate (PEP) is the primary acceptor in:
Q35easymcqBiologyNEET 20232026
Movement and accumulation of ions across a membrane against their concentration gradient can be explained by:
Q36mediummcqBiologyNEET 20222026
Match List - I with List - II:| List - I | List - II || :--- | :--- || (a) Manganese | (i) Activates the enzyme catalase || (b) Magnesium | (ii) Required for pollen germination || (c) Boron | (iii) Activates enzymes of respiration || (d) Iron | (iv) Functions in splitting of water during photosynthesis |
Q37easymcqBiologyNEET 20232026
Given below are two statements:Statement I: The forces generated by transpiration can lift a xylem-sized column of water over height.Statement II: Transpiration cools leaf surfaces sometimes to degrees, by evaporating cooling.In the light of the above statements, choose the most appropriate answer from the options given below:
Q38mediummcqBiologyNEET 20212026
Match List-I with List-II:
image
Q39easymcqBiologyNEET 20222026
Addition of more solutes in a given solution will:
Q40easymcqBiologyNEET 20222026
“Girdling Experiment” was performed by plant physiologists to identify the plant tissue through which:
Q41mediummcqBiologySSC CGL2026
Why do the desert plants take up the carbon dioxide for photosynthesis at night?
Q42mediummcqBiologyGeneral Knowledge Studies2026
Green algae are green because of:
Q43mediummcqBiologyGeneral Studies Mock Test2026
On which of the following component of chloroplast is chlorophyll arranged?
Q44easymcqGeneral ScienceStaff Selection Commission2026
A plant cell wall is mainly composed of:
Q45mediummcqBiologyNEET 20172026
With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?
Q46mediummcqBiologyNEET 20232026
Match List I with List II:| List I | List II || :--- | :--- || A. Iron | I. Synthesis of auxin || B. Zinc | II. Component of nitrate reductase || C. Boron | III. Activation of catalase || D. Molybdenum | IV. Cell elongation and differentiation |
Q47mediummcqBiologyGeneral Knowledge2026
Deficiency of which element causes chlorosis?
Q48mediummcqGeneral Science@NUM: 29SSC CGL2026
Carotene in fruits and vegetables gives it which color?
Q49mediummcqGeneral AwarenessPractice Paper2026
Which pigment is responsible for the green colour of plants?
Q50mediummcqBiologyNEET 20232026
Match List I with List II:| List I | List II || :--- | :--- || A. Cohesion | I. More attraction in liquid phase || B. Adhesion | II. Mutual attraction among water molecules || C. Surface tension | III. Water loss in liquid phase || D. Guttation | IV. Attraction towards polar surfaces |
Q51mediummcqBiologyNEET 20172026
Which statement is wrong for Krebs' cycle?
Q52easymcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2018
Which of the following is not a micronutrient?
Q53easymcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2018
The element, essential for synthesis of protein in plants, is
Q54easymcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2017
The source of oxygen liberated as byproduct during photosynthesis is
Q55easymcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2017
The source of oxygen liberated as a byproduct during photosynthesis is
Q56mediummcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2017
Which of the following pigments is associated with the germination of seeds?
Q57mediummcqBiologyBiology
0% accuracy
CAM helps the plants in:
Q58mediummcqBiologyBiology
0% accuracy
Which one of the following elements is not an essential micronutrient for plant growth?
Q59mediummcqBiologyBiology
0% accuracy
The wavelength of light absorbed by form of phytochrome is:
Q60mediummcqBiologyBiology
100% accuracy
A plant requires magnesium for:
Q61mediummcqBiologyBiology
0% accuracy
"Foolish seedling" disease of rice led to the discovery of:
Q62mediummcqBiologyBiology
0% accuracy
Which one of the following pairs, is not correctly matched?
Q63mediummcqBiologyBiology
0% accuracy
In the leaves of plants, malic acid formation during fixation occurs in the cells of:
Q64mediummcqBiologyBiology
0% accuracy
Two cells A and B are contiguous. Cell A has osmotic pressure , turgor pressure and diffusion pressure deficit . Cell B has osmotic pressure , turgor pressure and diffusion pressure deficit . The result will be:
Q65easymcqBiologyBiology
Electrons from excited chlorophyll molecules of Photosystem II are accepted first by:
Q66hardmcqBiologyBiology
Read the following four statements (A – D):(A) Both, photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane.(B) In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth.(C) Stamens in flowers of Gloriosa and Petunia are polyandrous.(D) Symbiotic nitrogen-fixers occur in free-living state also in soil.How many of the above statements are right?
Q67mediummcqBiologyBiology
Which one of the following is correctly matched?
Q68easymcqBiologyBiology
Manganese () is required in:
Q69mediummcqBiologyBiology
The correct sequence of cell organelles during photorespiration is:
Q70easymcqBiologyBiology
The best defined function of Manganese in green plants is:
Q71easymcqBiologyBiology
One of the synthetic auxins is:
Q72mediummcqBiologyBiology
A process that makes an important difference between and plants is:
Q73mediummcqBiologyBiology
The three boxes in a diagram represent the major biosynthetic pathways in aerobic respiration. Pathway A is Glycolysis, B is Krebs cycle, and C is ETS. Arrows represent reactants/products. Arrows 4, 8, and 12, which exit from each pathway respectively, can all represent:
Q74mediummcqBiologyBiology
Aerobic respiratory pathway is appropriately termed:
Q75easymcqBiologyBiology
During seed germination, its stored food is mobilized by:
Q76easymcqBiologyBiology
Which of the following criteria does not pertain to facilitated transport?
Q77easymcqBiologyBiology
Guard cells help in:
Q78easymcqBiologyBiology
The first stable product of fixation of atmospheric nitrogen in leguminous plants is:
Q79mediummcqBiologyBiology
Which of the following metabolites is common to the respiration-mediated breakdown of fats, carbohydrates, and proteins?
Q80mediummcqBiologyBiology
In germinating seeds, fatty acids are degraded exclusively in the:
Q81hardmcqBiologyBiology
Which one of the following acids is a derivative of carotenoids?
Q82hardmcqBiologyBiology
Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly-cut coleoptile stumps. Of what significance is this experiment?
Q83mediummcqBiologyBiology
Deficiency symptoms of nitrogen and potassium are visible first in:
Q84easymcqBiologyBiology
Which one of the following is NOT a micronutrient?
Q85mediummcqBiologyBiology
In which one of the following processes is not released?
Q86mediumassertion/reasoningBiologyBiology
The atmospheric concentration of at which photosynthesis just compensates for respiration is referred to as compensation point.
Q87mediummcqBiologyBiology
Anoxygenic photosynthesis is characteristic of:
Q88easymcqBiologyBiology
plants are photosynthetically more efficient than plants because:
Q89easymcqBiologyBiology
An element playing an important role in nitrogen fixation is:
Q90easymcqBiologyBiology
A few normal seedlings of tomato were kept in a dark room. After a few days they were found to have become white-coloured like albinos. Which of the following terms will you use to describe them?
Q91easymcqBiologyBiology
Which one of the following growth regulators is known as the 'stress hormone'?
Q92easymcqBiologyBiology
plants are more efficient in photosynthesis than plants due to:
Q93easymcqBiologyBiology
Root pressure is usually developed due to:
Q94easymcqBiologyBiology
The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?
Q95easymcqBiologyBiology
Rupture and fractionation of the water column do not occur during the ascent of sap because of:
Q96mediummcqBiologyBiology
as the first fixation product was discovered in photosynthesis of:
Q97mediummcqBiologyBiology
During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by:
Q98mediummcqBiologyBiology
Roots play insignificant role in absorption of water in:
Q99easymcqBiologyBiology
The energy releasing metabolic process in which substrate is oxidised without an external electron acceptor is called:
Q100mediummcqBiologyBiology
A column of water within xylem vessels of tall trees does not break under its weight because of:
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We have 118 Plant Physiology questions spread across 2 pages, covering easy, medium, and hard difficulty levels with detailed explanations.
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Plant Physiology questions are commonly asked in Biology, Mathematics and Science, General Awareness, General Science, Science. You can filter by exam using the links above.
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Start with easy questions to build confidence, then tackle medium and hard ones. Use the filter buttons to sort by difficulty. Reveal the answer only after attempting each question, and read the explanation thoroughly.