The complex II of mitochondrial electron transport chain is also known as
Plant Physiology
Every question from past board papers on Plant Physiology, newest paper first. Open any question for its full worked answer.
NEET UG 2025 question paper (official, booklet 45)
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Which one of the following phytohormones promotes nutrient mobilization which helps in the delay of leaf senescence in plants?
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Match List I with List II :
List I: A. Chlorophyll a; B. Chlorophyll b; C. Xanthophylls; D. Carotenoids
List II: I. Yellow-green; II. Yellow; III. Blue-green; IV. Yellow to Yellow-orange
Choose the option with all correct matches.
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Which of the following statements about RuBisCO is true?
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Read the following statements on plant growth and development.
A. Parthenocarpy can be induced by auxins.
B. Plant growth regulators can be involved in promotion as well as inhibition of growth.
C. Dedifferentiation is a pre-requisite for re-differentiation.
D. Abscisic acid is a plant growth promoter.
E. Apical dominance promotes the growth of lateral buds.
Choose the option with all correct statements.
NEET UG 2024 question paper (official, booklet S6)
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How many molecules of ATP and NADPH are required for every molecule of \(CO_2\) fixed in the Calvin cycle?
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Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin
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Which of the following are required for the dark reaction of photosynthesis?
A. Light
B. Chlorophyll
C. \(CO_2\)
D. ATP
E. NADPH
Choose the correct answer from the options given below:
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The capacity to generate a whole plant from any cell of the plant is called:
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Formation of interfascicular cambium from fully developed parenchyma cells is an example for
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Match List I with List II
List I: A. Citric acid cycle; B. Glycolysis; C. Electron transport system; D. Proton gradient
List II: I. Cytoplasm; II. Mitochondrial matrix; III. Intermembrane space of mitochondria; IV. Inner mitochondrial membrane
Choose the correct answer from the options given below:
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Given below are two statements:
Statement I : In \(C_3\) plants, some \(O_2\) binds to RuBisCO, hence \(CO_2\) fixation is decreased.
Statement II : In \(C_4\) plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration.
In the light of the above statements, choose the correct answer from the options given below:
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Identify the step in tricarboxylic acid cycle, which does not involve oxidation of substrate.
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Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield?
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Which of the following are fused in somatic hybridization involving two varieties of plants?
NEET UG 2023 question paper (official, booklet G6)
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Which micronutrient is required for splitting of water molecule during photosynthesis?
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Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : ATP is used at two steps in glycolysis.
Reason R : First ATP is used in converting glucose into glucose-6-phosphate and second ATP is used in conversion of fructose-6-phosphate into fructose-1-6-diphosphate.
In the light of the above statements, choose the correct answer from the options given below :
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Which hormone promotes internode/petiole elongation in deep water rice?
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How many ATP and NADPH\(_2\) are required for the synthesis of one molecule of Glucose during Calvin cycle?
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The reaction centre in PS II has an absorption maxima at
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Spraying of which of the following phytohormone on juvenile conifers helps in hastening the maturity period, that leads to early seed production?
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In tissue culture experiments, leaf mesophyll cells are put in a culture medium to form callus. This phenomenon may be called as :
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Given below are two statements :
Statement I : The forces generated by transpiration can lift a xylem-sized column of water over 130 meters height.
Statement II : Transpiration cools leaf surfaces sometimes 10 to 15 degrees, by evaporative cooling.
In the light of the above statements, choose the most appropriate answer from the options given below :
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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. Activator of catalase
D. Molybdenum | IV. Cell elongation and differentiation
Choose the correct answer from the options given below :
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Which of the following combinations is required for chemiosmosis?
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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
Choose the correct answer from the options given below :
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Match List I with List II :
List I | List II
A. Oxidative decarboxylation | I. Citrate synthase
B. Glycolysis | II. Pyruvate dehydrogenase
C. Oxidative phosphorylation | III. Electron transport system
D. Tricarboxylic acid cycle | IV. EMP pathway
Choose the correct answer from the options given below :
NEET UG 2022 question paper (official, booklet R6)
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Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants :
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Which one of the following plants does not show plasticity ?
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Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis ? It involves :
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Given below are two statements :
Statement I :
The primary CO\(_2\) acceptor in C\(_4\) plants is phosphoenolpyruvate and is found in the mesophyll cells.
Statement II :
Mesophyll cells of C\(_4\) plants lack RuBisCo enzyme.
In the light of the above statements, choose the correct answer from the options given below :
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The gaseous plant growth regulator is used in plants to :
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What amount of energy is released from glucose during lactic acid fermentation ?
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What is the net gain of ATP when each molecule of glucose is converted to two molecules of pyruvic acid ?
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Match List - I with List - II.
List - I: (a) Manganese (b) Magnesium (c) Boron (d) Iron
List - II: (i) Activates the enzyme catalase (ii) Required for pollen germination (iii) Activates enzymes of respiration (iv) Functions in splitting of water during photosynthesis
Choose the correct answer from the options given below :
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What is the role of large bundle shealth cells found around the vascular bundles in C\(_4\) plants ?
NEET UG 2021 question paper (official, booklet M4)
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Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called :
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The plant hormone used to destroy weeds in a field is :
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The site of perception of light in plants during photoperiodism is :
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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
Choose the correct answer from the options given below.
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The first stable product of CO\(_2\) fixation in sorghum is :
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Which of the following statements is incorrect ?
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Which of the following statements is incorrect ?
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Match Column - I with Column - II.
Column - I | Column - II
(a) Nitrococcus | (i) Denitrification
(b) Rhizobium | (ii) Conversion of ammonia to nitrite
(c) Thiobacillus | (iii) Conversion of nitrite to nitrate
(d) Nitrobacter | (iv) Conversion of atmospheric nitrogen to ammonia
Choose the correct answer from options given below.
NEET UG 2020 question paper (official, booklet E1)
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The process of growth is maximum during :
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Match the following concerning essential elements and their functions in plants :
(a) Iron (i) Photolysis of water
(b) Zinc (ii) Pollen germination
(c) Boron (iii) Required for chlorophyll biosynthesis
(d) Manganese (iv) IAA biosynthesis
Select the correct option :
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The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is :
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The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of :
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Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.
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In light reaction, plastoquinone facilitates the transfer of electrons from :
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Which of the following is not an inhibitory substance governing seed dormancy ?
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The number of substrate level phosphorylations in one turn of citric acid cycle is :
NEET UG 2019 question paper (official, booklet P1)
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Respiratory Quotient (RQ) value of tripalmitin is :
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What is the direction of movement of sugars in phloem ?
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What is the site of perception of photoperiod necessary for induction of flowering in plants ?
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Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalyzed by :
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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 ?
NEET UG 2018 question paper (official, booklet EE)
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Which of the following is *not* a product of light reaction of photosynthesis ?
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Stomatal movement is *not* affected by
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Oxygen is *not* produced during photosynthesis by
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Which of the following elements is responsible for maintaining turgor in cells ?
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What is the role of NAD\(^+\) in cellular respiration ?
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In which of the following forms is iron absorbed by plants ?
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Which of these statements is incorrect ?
NEET UG 2017 question paper (official, booklet B)
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The water potential of pure water is :
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Phosphoenol pyruvate (PEP) is the primary \(CO_2\) acceptor in :
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With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ?
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Fruit and leaf drop at early stages can be prevented by the application of :
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Which statement is wrong for Krebs' cycle ?
NEET UG 2016 Phase 1 question paper (official, booklet A)
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Emerson's enhancement effect and Red drop have been instrumental in the discovery of :
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In which of the following, all three are macronutrients ?
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In a chloroplast the highest number of protons are found in :
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The *Avena* curvature is used for bioassay of :
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A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant ?
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Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of following options :
NEET UG 2016 Phase 2 question paper (official, booklet ZZ)
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Which of the following biomolecules is common to respiration-mediated breakdown of fats, carbohydrates and proteins?
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A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?
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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?
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Phytochrome is a
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Which is essential for the growth of root tip?
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The process which makes major difference between \(C_3\) and \(C_4\) plants is
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Oxidative phosphorylation is