Plant Physiology MCQ


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21 Questions MCQ Test Mock Test Series of IIT JAM Biotechnology | Plant Physiology MCQ

Plant Physiology MCQ for IIT JAM 2022 is part of Mock Test Series of IIT JAM Biotechnology preparation. The Plant Physiology MCQ questions and answers have been prepared according to the IIT JAM exam syllabus.The Plant Physiology MCQ MCQs are made for IIT JAM 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Plant Physiology MCQ below.
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Plant Physiology MCQ - Question 1

Transpiration is least in which of the following conditions?

Detailed Solution for Plant Physiology MCQ - Question 1

High atmospheric humidity means large amount of water vapour in the surrounding atmosphere. There would be no more space in the atmosphere to hold more water vapours. So rate of transpiration decreases.

Plant Physiology MCQ - Question 2

The movement of leaves of Mimosa pudica are due to

Detailed Solution for Plant Physiology MCQ - Question 2

Seismonasty is the nastic response of a plant to touch or vibration. It is also known as thigmonasty.

Plant Physiology MCQ - Question 3

Gibberellins promote

Detailed Solution for Plant Physiology MCQ - Question 3

Gibberelins promote seed germination. They stimulate the production of hydrolytic enzymes such as amylases, lipases, proteases. These enzyme solubilise the reserve food material and helps in germination.

Plant Physiology MCQ - Question 4

The circadian rhythms of plants and animals are maintained by which of the following?

Detailed Solution for Plant Physiology MCQ - Question 4

Cryptochromes are flavoproteins that are sensitive to blue light. They are present in both plants and animals and are involved in their circadian rhythms.

Plant Physiology MCQ - Question 5

In C4 plants, Calvin cycle takes place in 

Detailed Solution for Plant Physiology MCQ - Question 5

In Cplants special anatomy is present called kranz anatomy and Calvin cycle occurs in stroma of bundle sheath chloroplasts.

Plant Physiology MCQ - Question 6

Which of the following is a driving force for movement of water from soil to root during absorption of water by a plant?

Detailed Solution for Plant Physiology MCQ - Question 6

The osmotic potential is the amount of solute or minerals/ions, soil has more osmotic potential than roots, so ions move into the roots. To balance the solute potential, water also moves into the roots, which leads to absorption of water from soil by roots.

Plant Physiology MCQ - Question 7

Which of the following statement is true with regard to guard cells?

Detailed Solution for Plant Physiology MCQ - Question 7

Guard cells are not joined to each other by plasmodesmata.

Plant Physiology MCQ - Question 8

Cytochrome b structure has which centre?

Detailed Solution for Plant Physiology MCQ - Question 8

Cytochromes are heme-containing proteins. They have Fe centres.

Plant Physiology MCQ - Question 9

Match the following:

Detailed Solution for Plant Physiology MCQ - Question 9

Ascent of sap is the mechanism by which water travels in a plant against gravity. Assimilation means the process of absorption and digestion of nutrients by an organism. Somatic embryos are also known as artificial seeds. Asphyxiants destroy pests by causing them respiratory distress.

Plant Physiology MCQ - Question 10

The conversion of ACC to ethylene during ethylene biosynthesis is catalysed by which of the following?

Detailed Solution for Plant Physiology MCQ - Question 10

ACC oxidase catalyses the last step in ethylene biosynthesis i.e. the conversion of ACC to ethylene in the cytosol. 

Plant Physiology MCQ - Question 11

During photorespiration in plants, carbon dioxide is produced when glycine is converted to serine in

Detailed Solution for Plant Physiology MCQ - Question 11

Photorespiration in plants involves three organelles - chloroplast, peroxisome and mitochondria. Here, glycolate converts into glycine in peroxisomes and this glycine is converted into serine giving off CO2 in the process. This CO2 is produced in mitochondria.

Plant Physiology MCQ - Question 12

The process of ammonification is

Detailed Solution for Plant Physiology MCQ - Question 12

The process of converting organic nitrogen to ammonia is ammonification. It occurs during the process of decomposition of plants and animals by fungi and bacteria.

*Multiple options can be correct
Plant Physiology MCQ - Question 13

Photo respiration occurs in which of these sites?

Detailed Solution for Plant Physiology MCQ - Question 13

Photorespiration is the process in which the enzyme Rubisco binds to O2 instead of CO2. This reaction has 3 organelles where intermediate steps occur. These are chloroplast, mitochondria and peroxisome.

*Multiple options can be correct
Plant Physiology MCQ - Question 14

Which of the following is incorrect with regard to active transport?

Detailed Solution for Plant Physiology MCQ - Question 14

Active transport takes place against concentration gradient. It is an endergonic process.

*Multiple options can be correct
Plant Physiology MCQ - Question 15

Among the Following, Which Acid is a Derivative of Carotenoids?

Detailed Solution for Plant Physiology MCQ - Question 15

Abscisic acid is also called abscism. It is a plant hormone which has carotenoid as a precursor. ABA functions in many plant developmental processes, including bud dormancy. ABA is an isoprenoid plant hormone, which is synthesized in the plastidal 2-C-methyl-D-erythritol-4-phosphate (MEP) pathway, unlike the structurally related sesquiterpenes, which are formed from the mevalonic acid-derived precursor farnesyl diphosphate, the C15 backbone of ABA is formed after cleavage of C40 carotenoids in MEP.

*Multiple options can be correct
Plant Physiology MCQ - Question 16

Which of the following is correct statement?

Detailed Solution for Plant Physiology MCQ - Question 16

Sufur is a component of cysteine and methionine.

*Multiple options can be correct
Plant Physiology MCQ - Question 17

Which of the following reactions are catalysed by enzyme nitrogenase?

Detailed Solution for Plant Physiology MCQ - Question 17

Nitrogenase undertakes catalysis of all these reactions.

*Answer can only contain numeric values
Plant Physiology MCQ - Question 18

The number of water molecules required to generate one O2 in the light reaction of photosynthesis is _______[Answer in integer]


Detailed Solution for Plant Physiology MCQ - Question 18

2H2O → 2H2 + O2
∴ 2 molecules of water given are one molecule of oxygen and 2 molecules of hydrogen.

*Answer can only contain numeric values
Plant Physiology MCQ - Question 19

The number of ATP molecules required for fixing one molecule of COin C4 plants is  __________ [Answer in integer]


Detailed Solution for Plant Physiology MCQ - Question 19

The C4 cycle which involves PEP requires 2 ATP. The C3 cycle which is common in all plants requires 3 ATP.
Therefore, total ATP required to fix one molecule of CO2 in C4 plants is 5ATPs.

*Answer can only contain numeric values
Plant Physiology MCQ - Question 20

The number of electrons released during photolysis when 1 molecule of oxygen is evolved are__________[Answer in integer]


Detailed Solution for Plant Physiology MCQ - Question 20

The reaction is as follows:
 Thus 4 protons and 4 electrons are released to evolve 1 molecule of oxygen.

*Answer can only contain numeric values
Plant Physiology MCQ - Question 21

Number of turns of Calvin cycle required to make one molecule of glucose is __________ [Answer in integer]


Detailed Solution for Plant Physiology MCQ - Question 21

Glucose is a 6C molecule 1 C is fixed in each turn of the Calvin cycle so 6 turns are needed to make 1 glucose molecule.

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