Plant Physiology PYQs

2(C₅₁H₉₈C₆) + 145 O₂ → 102 CO₂ + 98 H₂O + energy The Respiratory Quotient (RQ) of a biomolecule used for respiration, as per the above equation would be:

Which one of the following phytohormones promotes nutrient mobilization which helps in the delay of leaf senescence in plants?

Match List I with List II : Choose the option with all correct matches.

Which of the following statements about RuBisCO is true?

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-dedifferentiation. D. Abscisic acid is a plant growth promoter. E. Apical dominance promotes the growth of lateral buds. Choose the option with all correct statements.

Formation of interfascicular cambium from fully developed parenchyma cells is an example for

Which of the following are required for the dark reaction of photosynthesis? A. Light B. Chlorophyll C. CO₂ D. ATP E. NADPH Choose the correct answer from the options given below:

How many molecules of ATP and NADPH are required for every molecule of CO₂ fixed in the Calvin cycle?

Bulliform cells are responsible for

Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin

Given below are two statements: Statement I : In C₃ plants, some O₂ binds to RuBisCO, hence CO₂ fixation is decreased. Statement II : In C₄ 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:

Identify the step in tricarboxylic acid cycle, which does not involve oxidation of substrate.

Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus increasing the yield?

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R : Assertion A : The first stage of gametophyte in the life cycle of moss is protonema stage. Reason R : Protonema develops directly from spores produced in capsule. In the light of the above statements, choose the most appropriate answer from the options given below :

Movement and accumulation of ions across a membrane against their concentration gradient can be explained by

Which hormone promotes internode/petiole elongation in deep water rice?

Which micronutrient is required for splitting of water molecule during photosynthesis?

Axile placentation is observed in

The reaction centre in PS II has an absorption maxima at

Spraying of which of the following phytohormone on juvenile conifers helps in hastening the maturity period, that leads to early seed production?

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 :

How many ATP and NADPH₂ are required for the synthesis of one molecule of Glucose during Calvin cycle?

Identify the pair of heterosporous pteridophytes among the following :

Match List I with List II : Choose the correct answer from the options given below :

Which of the following combinations is required for chemiosmosis?

Match List I with List II : Choose the correct answer from the options given below :

Which of the following is not observed during apoplastic pathway?

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:

Which one of the following plants does not show plasticity?

Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis? It involves:

Given below are two statements: Statement I: The primary CO₂ acceptor in C₄ plants is phosphoenolpyruvate and is found in the mesophyll cells. Statement II: Mesophyll cells of C₄ plants lack RuBisCO enzyme. In the light of the above statements, choose the correct answer from the options given below:

The gaseous plant growth regulator is used in plants to:

What amount of energy is released from glucose during lactic acid fermentation?

What is the net gain of ATP when each molecule of glucose is converted to two molecules of pyruvic acid?

Match List-I with List-II: Choose the correct answer from the options given below :

‘Girdling Experiment’ was performed by Plant Physiologists to identify the plant tissue through which:

Addition of more solutes in a given solution will:

What is the role of large bundle sheath cells found around the vascular bundles in C₄ plants?

The first stable product of $CO_2$ fixation in Sorghum is

Match List-I with List-II. Choose the correct answer from the options given below.

The site of perception of light in plants during photoperiodism is:

Which of the following statements is incorrect?

Match Column-I with Column-II. Choose the correct answer from the options given below.Match Column-I with Column-II. Choose the correct answer from the options given below.

Which of the following statements is incorrect?

The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are

Match the following concerning essential elements and their functions in plants: Select the correct option

Identify the incorrect statement.

The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is:

The oxygenation activity of RuBisCO enzyme in photorespiration leads to the formation of:

Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.

In light reaction, plastoquinone facilitates the transfer of electrons from:

Which of the following is not an inhibitory substance governing seed dormancy?

In Hatch and Slack pathway, the primary $CO_2$ acceptor is

Removal of shoot tips is a very useful technique to boost the production of tea-leaves. This is because

One scientist cultured Cladophora in a suspension of Azotobacter and illuminated the culture by splitting light through a prism. He observed that bacteria accumulated mainly in the region of :

In order to increase the yield of sugarcane crop, which of the following plant growth regulators should be sprayed?

Which of the following is not a feature of active transport of solutes in plants?

What will be the direction of flow of water when a plant cell is placed in a hypotonic solution?

Where is the respiratory electron transport system (ETS) located in plants?

Identify the wrong statement in context of heartwood.

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

Zygotic meiosis is characteristic of

Life cycle of Ectocarpus and Fucus respectively are

Phosphoenol pyruvate (PEP) is the primary CO$_2$ acceptor in:

Which statement is wrong for Kreb's cycle?

The water potential of pure water is

Which of the following facilitates opening of stomatal aperture?

Fruit and leaf drop at early stages can be prevented by the application of

The process which makes major difference between C₃ and C₄ plants is

Root pressure develops due to:

The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?

Chromatophores take part in:

Roots play insignificant role in absorption of water in:

A column of water within xylem vessels of tall trees does not break under its weight because of:

In photosynthesis, the light-independent reactions take place at:

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?

Deficiency symptoms of nitrogen and potassium are visible first in:

In which one of the following processes is CO₂ not released?

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?

Which one of the following growth regulators is known as stress hormone?

Read the following four statements A, B, C and D and select the right option having both correct statements. (A) Z-scheme of light reaction takes place in presence of PSI only. (B) Only PSI is functional in cyclic photophosphorylation. (C) Cyclic photophosphorylation results in synthesis of ATP and $NADPH_2$. (D) Stroma lamellae lack PSII as well as NADP reductase. The correct statements are :

Kranz anatomy is one of the characteristics of the leaves of :

One of the commonly used plant growth hormones in tea plantations is :

Root development is promoted by :

Study the pathway given below. In which of the following options correct words for all the three blanks A, B and C are indicated.

Which one of the following is a xerophytic plant in which the stem is modified into a flat, green and succulent structure?

Guard cells help in:

Manganese is required in:

Oxygenic photosynthesis occurs in:

Aerobic respiratory pathway is appropriately termed:

Cyclic photophosphorylation results in the formation of:

A competitive inhibitor of succinic dehydrogenase is

In germinating seeds fatty acids are degraded exclusively in the

The C$_4$ plants are photosynthetically more efficient than C$_3$ plants because

The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of

In leaves of C$_4$ plants malic acid synthesis during CO$_2$ fixation occurs in

The energy releasing process in which the substrate is oxidised without an external electron acceptor is called

Electrons from excited chlorophyll molecule of photosystem II are accepted first by

In photorespiration, RuBP is oxidized to form glycolate and glycerate. Which of the following flow diagrams correctly represents the photorespiratory (PCO) cycle involving chloroplasts, peroxisomes and mitochondria?

Photosynthesis in C4 plants is relatively less limited by atmospheric CO$_2$ levels because:

Auxospores and hormocysts are formed, respectively, by:

As compared to a C$_3$ plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C$_4$ plants?

The ability of the Venus flytrap to capture insects is due to:

During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP?

Carbohydrates, the most abundant biomolecules on earth, are produced by:

The deficiencies of micro-nutrients not only affects growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport?

Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on:

Potometer works on the principle of:

Photosynthetic Active Radiation (PAR) has the following range of wavelengths: