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31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2


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25 Questions MCQ Test Biology 31 Years NEET Chapterwise Solved Papers | 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 for NEET 2022 is part of Biology 31 Years NEET Chapterwise Solved Papers preparation. The 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 questions and answers have been prepared according to the NEET exam syllabus.The 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 below.
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31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 1

In sugarcane plant 14CO2 is fixed in malic acid, in which the enzyme that fixes CO2 is [2003]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 1

Sugarcane is a C4 plant in which CO2 is fixed in malic acid by the enzyme phosphoenol pyruvic acid carboxylase present in mesophyll cells.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 2

 Stomata of CAM plants [2003]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 2

To conserve water, the stomata of  CAM  plants open during night to take up CO2 and store it in the form of Malic acid which is utilised during the time of photosynthesis. 

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 3

Which of the following absorb light energy for photosynthesis? [2002]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 3

Each pigment has its own absorption spectrum, chlorophyll absorbs light energy in blue and red region.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 4

In photosynthesis energy from light reaction to dark reaction is transferred in the form of [2002] 

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 4

ATP molecules produced in the light reaction are used in the dark reaction to fix CO2 to form organic compound.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 5

Cytochrome is [2001]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 5

Cytochrome is Fe containing porphyrin pigment. These are electron transferring proteins often regarded as enzymes.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 6

Which pigment system is inactivated in red drop?[2001]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 6

The fall in photosynthetic yield beyond the red region of the spectrum (680 runs) is called red drop.
Reaction center of PS-2 is 680 while that of PA-1 is 700.
So the psII system will be inactive.
So the correct option is PS II.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 7

Which pair is wrong? [2001]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 7

Maize is a C4 plant carrying out Hatch and Slack pathway. These plants show Kranz anatomy and overcome photorespiration.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 8

 Photochemical reactions in the chloroplast are directly involved in [2000]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 8

The photochemical phase of photosynthesis involves fixing light energy and photolysis of water producing ATP and  NADPH.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 9

Fixation of one CO2 molecule through Calvin cycle requires [2000]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 9

2 ATP are required during conversion of PGA to 1, 3-diphosphoglyceric acid and 1 ATP during conversion of glyceraldehyde phosphate to ribulose biphosphate. 2NADH2 molecules are utilised for converting 1, 3-diphosphoglyceric acid to glyceraldehyde phosphate.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 10

How many turns of Calvin cycle yield one molecule of glucose ? [1996, 2000]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 10

Each turn of Calvin cycle generates one carbon atom hence six turns of the cycle is required to generate one molecule of hexose sugar glucose.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 11

The first step of photosynthesis is [2000]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 11

Light reaction is the first step of  photosynthesis. Attachment of  CO2 to 5 carbon sugar occurs in the next step dark reaction

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 12

The enzyme which fixes CO2 in C4 plants is [2000]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 12

 RuBP carboxylase fixes CO2 in C3 plants. Hydrogenase catalyses addition of hydrogen. 

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 13

Which enzyme is most abudantly found on earth?[1999]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 13

RUBISCO  is the enzyme involved in Calvin cycle. Nitrogenase catalyses nitro- genation. Invertase catalyses breaking of sucrose to glucose and fructose.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 14

Which one of the following statements about cytochrome P-450 is wrong? [1998]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 14

Cytochrome P450 (CyP) is a host of enzymes that use iron to oxidize, often as part of the body's strategy to dispose of potentially harmful substances making them more water-soluble. These are found in plants, animals, and microbes and are involved in a variety of oxidative reactions in cells. These catalyse a variety of reactions including epoxidation, /V-dialkylation,o-dialkylation,.v-oxidation and hydroxylation. A typical cytochrome P450 catalyzed reactions is

NADPH + H+ + O2 + RH → NADP- + H20 + R - OH

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 15

Protochlorophyll differs from chlorophyll in lacking [1998]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 15

Photochlorophyll lacks two hydrogens at the 7 and 8 positions at the porphyrin part of the pyrrole ring. It is an oxidation product of chlorophyll a. In presence of light, it is reduced and esterified with phytol group to produce chlorophyll in presence of enzyme chlorophyllase.
So the correct option is '2 hydrogen atoms in one of its pyrrole rings'.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 16

NADPH2 is generated through [1997]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 16

Photosystem I is the second photosystem in the photosynthetic light reactions of algae, plants and some bacteria. Photosystem I is so named because it was discovered before photosystem II. It produces NADPH2.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 17

Which one of the following is represented by Calvin cycle? [1996]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 17

In dark phase of calvin cycle of photosynthesis the CO2 is reduced to Glucose in stroma of chloroplast, making use of the ATP & NADPH2, (available from light phase).

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 18

Photosynthetically active radiation is represented by the range of wavelength of [1996, 2004, 05]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 18

Photosynthesis takes place only in the visible part (400 - 700 nm wavelength) of electromagnetic radiations. Hence this component comprises the photosynthetically active radiation.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 19

Chlorophyll ‘a’ molecule at its carbon atom 3 of the Pyrrole ring II has one of the following [1996, 97]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 19

The empirical formula of chlorophyll molecule is C55H7205N4Mg. It has tadpole like configuration. It is consisted of a porphyrin head and a phytol tail. Porphyrin is a cyclic tetrapyrol structure, having a magnesium atom in the centre. Chlorophyll a methyl group (CH3) is attached to the third carbon in the porphyrin head.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 20

The principle of limiting factors was proposed by[1996]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 20

The principle of limiting factors was formulated by Blackmann (1905). It states that when a process is conditioned as to its rapidity by a number of separate factors, the rate of process is limited by the pace of slowest factor.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 21

Photorespiration  is favoured by [1996]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 21

Photorespiratory loss of CO2 occurs when RUBISCO starts functioning as an oxygenase instead of carboxylase  under conditions of  high O2 and low CO2. It involves three organelles chloroplast, mitochondria and peroxisomes. Half of the photosynthetically fixed carbon (in the form of RUBP) may be lost into the atmosphere through this process and no ATP formation occurs.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 22

The specific characteristic of C4-plants is [1995]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 22

Anatomy of leaves of C4– plant is called kranz anatomy. In the mesophyll cells of these plants pallisade tissue is absent.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 23

Which one occurs both during cyclic and noncyclic modes of photophosphorylation? [1994]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 23

Cyclic photophosphorylation involves only PSI and there occurs only ATP formation.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 24

Nine-tenth of all photosynthesis of world (85-90%) is carried out by [1994]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 24

85-90% of all photosynthesis of world is carried out by phytoplanktons in ocean.

31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 25

Pigment acting as a reaction centre during photosynthesis is [1994]

Detailed Solution for 31 Years NEET Previous Year Questions: Photosynthesis in Higher Plants - 2 - Question 25

P700 consists of a chl a and chl b molecules and is named after maximum absorption by pigment or photocentre at that wavelength.

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