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Plant Physiology Questions

Practice 99 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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99
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42
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52
Medium
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5
Hard
Practice by Exam:Biology(95)General Awareness(2)General Science(2)

About Plant Physiology — practice questions, PYQs & concepts

Plant Physiology is a frequently-tested topic on Biology, General Awareness, General Science. ExamTest.live currently lists 99 Plant Physiology questions spanning previous-year papers from 2026 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 (95), General Awareness (2) and General Science (2). Click any exam chip above to drill down to that exam-specific question set.

How to use this page

  • Start easy: 42 easy Plant Physiology questions are available — build fluency before moving up.
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All Plant Physiology Questions(1–99 of 99)

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Q1mediummcqGeneral ScienceSSC GD2026
0% accuracy
Photosynthesis in plants converts light energy to ______ energy.
Q2easymcqBiologyNEET (UG) 20172026
0% accuracy
Fruit and leaf drop at early stages can be prevented by the application of:
Q3mediummcqBiologyNEET 20192026
0% accuracy
What is the direction of movement of sugars in phloem?
Q4easymcqBiologyNEET 20192026
0% accuracy
Thiobacillus is a group of bacteria helpful in carrying out:
Q5easymcqBiologyNEET 20192026
0% accuracy
Xylem translocates:
Q6easymcqBiologyNEET 20192026
0% accuracy
What is the site of perception of photoperiod necessary for induction of flowering in plants?
Q7easymcqBiologyNEET 20192026
0% accuracy
Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalyzed by:
Q8easymcqBiologyNEET 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?
Q9easymcqBiologyNEET 20192026
0% accuracy
Respiratory Quotient (RQ) value of tripalmitin is:
Q10easymcqBiologyNEET (UG) 20172026
0% accuracy
The water potential of pure water is:
Q11mediummcqBiologyNEET (UG) 20172026
0% accuracy
Which of the following facilitates opening of stomatal aperture?
Q12mediummcqGeneral AwarenessSSC Selection Post 2018 Higher Secondary Level2026
100% 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।
Q13mediummcqGeneral 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?
Q14easymcqBiologyNEET 20172026
The water potential of pure water is:
Q15mediummcqBiologyGeneral Studies Mock Test2026
On which of the following component of chloroplast is chlorophyll arranged?
Q16easymcqBiologyNEET (UG) 20182026
Oxygen is not produced during photosynthesis by:
Q17easymcqBiologyNEET (UG) 20182026
Which of the following elements is responsible for maintaining turgor in cells?
Q18easymcqBiologyNEET (UG) 20182026
In which of the following forms is iron absorbed by plants?
Q19mediummcqBiologyNEET (UG) 20182026
Stomatal movement is not affected by:
Q20easymcqBiologyNEET 20172026
Phosphoenol pyruvate (PEP) is the primary acceptor in:
Q21easymcqBiologyNEET 20172026
Fruit and leaf drop at early stages can be prevented by the application of:
Q22mediummcqBiologyNEET 20172026
With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?
Q23mediummcqBiologyNEET 20172026
Which statement is wrong for Krebs' cycle?
Q24mediummcqBiologyNEET 20172026
Which of the following facilitates opening of stomatal aperture?
Q25mediummcqBiologyNEET 20212026
Match List-I with List-II:
image
Q26mediummcqBiologyGeneral Knowledge Studies2026
Green algae are green because of:
Q27easymcqGeneral ScienceStaff Selection Commission2026
A plant cell wall is mainly composed of:
Q28mediummcqBiologyNEET 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 |
Q29mediummcqBiologyNEET 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 |
Q30easymcqBiologyNEET 20232026
Movement and accumulation of ions across a membrane against their concentration gradient can be explained by:
Q31easymcqBiologyNEET 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:
Q32easymcqBiologyNEET 20222026
Addition of more solutes in a given solution will:
Q33easymcqBiologyNEET 20222026
“Girdling Experiment” was performed by plant physiologists to identify the plant tissue through which:
Q34easymcqBiologyNEET 20222026
Which one of the following produces nitrogen fixing nodules on the roots of Alnus?
Q35mediummcqBiologyNEET 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 |
Q36mediummcqBiologyNEET 20212026
Match List-I with List-II:
image
Q37mediummcqBiologyNEET 2020 E12026
The process of growth is maximum during:
Q38mediummcqBiologyBiology
0% accuracy
CAM helps the plants in:
Q39mediummcqBiologyBiology
Roots play insignificant role in absorption of water in:
Q40mediummcqBiologyBiology
A column of water within xylem vessels of tall trees does not break under its weight because of:
Q41easymcqBiologyBiology
In photosynthesis, the light-independent reactions take place at:
Q42mediummcqBiologyBiology
The avena curvature is used for bioassay of:
Q43mediummcqBiologyBiology
Which of the following biomolecules is common to respiration-mediated breakdown of fats, carbohydrates and proteins?
Q44hardmcqBiologyBiology
A few drops of sap were collected by cutting across a plant stem. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?
Q45hardmcqBiologyBiology
You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?
Q46mediummcqBiologyBiology
Phytochrome is a:
Q47mediummcqBiologyBiology
Which is essential for the growth of root tip?
Q48mediummcqBiologyBiology
The process which makes major difference between C3 and C4 plants is:
Q49mediummcqBiologyBiology
Oxidative phosphorylation is:
Q50easymcqBiologyBiology
The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?
Q51easymcqBiologyBiology
In leaves of plants, malic acid synthesis during fixation occurs in:
Q52mediummcqBiologyBiology
as the first fixation product was discovered in photosynthesis of:
Q53easymcqBiologyBiology
plants are more efficient in photosynthesis than plants due to:
Q54easymcqBiologyBiology
An element playing an important role in nitrogen fixation is:
Q55easymcqBiologyBiology
Which one of the following is NOT a micronutrient?
Q56hardmcqBiologyBiology
Which one of the following acids is a derivative of carotenoids?
Q57easymcqBiologyBiology
Guard cells help in:
Q58mediummcqBiologyBiology
Aerobic respiratory pathway is appropriately termed:
Q59easymcqBiologyBiology
One of the synthetic auxins is:
Q60easymcqBiologyBiology
Manganese () is required in:
Q61easymcqBiologyBiology
Electrons from excited chlorophyll molecules of Photosystem II are accepted first by:
Q62mediummcqBiologyBiology
Substrate oxidation without an external electron acceptor is called:
Q63easymcqBiologyBiology
The importance of day length in flowering of plants was first shown in:
Q64easymcqBiologyBiology
The energy releasing metabolic process in which substrate is oxidised without an external electron acceptor is called:
Q65easymcqBiologyBiology
Rupture and fractionation of the water column do not occur during the ascent of sap because of:
Q66easymcqBiologyBiology
plants are photosynthetically more efficient than plants because:
Q67mediummcqBiologyBiology
In germinating seeds, fatty acids are degraded exclusively in the:
Q68mediummcqBiologyBiology
A plant requires magnesium for:
Q69mediummcqBiologyBiology
Which one of the following elements is not an essential micronutrient for plant growth?
Q70mediummcqBiologyBiology
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:
Q71mediummcqBiologyBiology
Which one of the following pairs, is not correctly matched?
Q72mediummcqBiologyBiology
"Foolish seedling" disease of rice led to the discovery of:
Q73mediummcqBiologyBiology
The wavelength of light absorbed by form of phytochrome is:
Q74mediummcqBiologyBiology
In the leaves of plants, malic acid formation during fixation occurs in the cells of:
Q75mediumassertion/reasoningBiologyBiology
The atmospheric concentration of at which photosynthesis just compensates for respiration is referred to as compensation point.
Q76easymcqBiologyBiology
During seed germination, its stored food is mobilized by:
Q77mediummcqBiologyBiology
Gibberellins can promote seed germination because of their influence on:
Q78easymcqBiologyBiology
Root pressure is usually developed due to:
Q79easymcqBiologyBiology
Which one of the following growth regulators is known as the 'stress hormone'?
Q80easymcqBiologyBiology
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?
Q81mediummcqBiologyBiology
Anoxygenic photosynthesis is characteristic of:
Q82mediummcqBiologyBiology
In which one of the following processes is not released?
Q83mediummcqBiologyBiology
Deficiency symptoms of nitrogen and potassium are visible first in:
Q84hardmcqBiologyBiology
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?
Q85mediummcqBiologyBiology
Which of the following metabolites is common to the respiration-mediated breakdown of fats, carbohydrates, and proteins?
Q86easymcqBiologyBiology
The first stable product of fixation of atmospheric nitrogen in leguminous plants is:
Q87easymcqBiologyBiology
Which of the following criteria does not pertain to facilitated transport?
Q88mediummcqBiologyBiology
During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by:
Q89mediummcqBiologyBiology
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:
Q90mediummcqBiologyBiology
A process that makes an important difference between and plants is:
Q91easymcqBiologyBiology
The best defined function of Manganese in green plants is:
Q92mediummcqBiologyBiology
The correct sequence of cell organelles during photorespiration is:
Q93mediummcqBiologyBiology
Which one of the following is correctly matched?
Q94hardmcqBiologyBiology
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?
Q95mediummcqBiologyBiology
Which one of the following is not an essential mineral element for plants?
Q96mediummcqBiologyBiology
Guttation is the result of:
Q97mediummcqBiologyBiology
In Kranz anatomy, the bundle sheath cells have:
Q98mediummcqBiologyBiology
Which one of the following is essential for photolysis of water?
Q99easymcqBiologyBiology
Photoperiodism was first characterised in:

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How many Plant Physiology questions are on ExamTest.live?▼
We have 99 Plant Physiology questions spread across 1 pages, covering easy, medium, and hard difficulty levels with detailed explanations.
Are Plant Physiology MCQs free?▼
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Which exams include Plant Physiology questions?▼
Plant Physiology questions are commonly asked in Biology, General Awareness, General Science. You can filter by exam using the links above.
How do I practice Plant Physiology questions effectively?▼
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.