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Test: Respiration in Plants - 1 - NEET MCQ


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25 Questions MCQ Test Biology Class 11 - Test: Respiration in Plants - 1

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Test: Respiration in Plants - 1 - Question 1

The organism which depend on the dead and decaying organic matter is:

Detailed Solution for Test: Respiration in Plants - 1 - Question 1

The organism that depends on dead and decaying organic matter is called a saprophyte. Saprophytes are a type of decomposer that obtain their nutrients and energy by breaking down dead plant or animal material. They play a vital role in the ecosystem by recycling nutrients and returning them to the environment for other organisms to use. 

Example: Moulds, Mushroom etc. 

  • Autotrophs, on the other hand, are organisms that can produce their own food using inorganic substances and an external energy source, such as sunlight. They convert carbon dioxide and water into organic compounds through the process of photosynthesis (in plants) or chemosynthesis (in some bacteria). Autotrophs do not rely on dead organic matter for their nutrition.
  • Carnivores are organisms that primarily consume the flesh of other animals. They obtain their energy and nutrients by hunting and feeding on other living organisms, rather than on dead organic matter.
  • Herbivores are organisms that primarily consume plant material. They obtain their energy and nutrients by feeding on plants or plant parts. Herbivores generally do not depend directly on dead and decaying organic matter as their main source of nutrition.
Test: Respiration in Plants - 1 - Question 2

Energy is stored in the form of:

Detailed Solution for Test: Respiration in Plants - 1 - Question 2

Energy is a fundamental requirement for all living organisms to carry out their various biological processes. Within cells, energy is stored and transferred in different molecules. The molecule that primarily stores and transfers energy in living systems is called adenosine triphosphate, or ATP.

A: FAD (Flavin adenine dinucleotide) is another molecule involved in energy transfer within cells, but it is not the primary molecule for energy storage.

B: NADH (Nicotinamide adenine dinucleotide) is an important molecule in cellular respiration, which is involved in the transfer of electrons and hydrogen ions during energy production. While it plays a role in energy transfer, it is not the primary molecule for energy storage.

D: ADP (Adenosine diphosphate) is the molecule that forms when one phosphate group is removed from ATP. It is the "lower energy" form of ATP and can be converted back into ATP by adding a phosphate group. However, it is not the primary molecule for energy storage.

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Test: Respiration in Plants - 1 - Question 3

The TCA cycle starts with:

Detailed Solution for Test: Respiration in Plants - 1 - Question 3

The TCA cycle begins with a condensation reaction. In this step, an acetyl group, derived from the breakdown of glucose or fatty acids, combines with oxaloacetic acid (OAA), a four-carbon molecule, in the presence of water. This condensation reaction forms a six-carbon compound called citric acid or citrate.

The complete reaction is as follows:
Acetyl-CoA + OAA + H2O → Citric Acid (Citrate)

The condensation step is significant because it marks the entry of the acetyl group into the TCA cycle and the beginning of a series of enzymatic reactions that ultimately lead to the release of energy and the regeneration of OAA.

Test: Respiration in Plants - 1 - Question 4

During anaerobic respiration less energy is produced than aerobic respiration because:

Detailed Solution for Test: Respiration in Plants - 1 - Question 4

During anaerobic respiration, less energy is produced compared to aerobic respiration because incomplete oxidation of glucose occurs. Anaerobic respiration occurs in the absence of oxygen, typically in situations where oxygen is not readily available or during strenuous exercise when oxygen demand exceeds supply.

Test: Respiration in Plants - 1 - Question 5

The enzyme that interconnects the glycolysis and kreb cycle is:

Detailed Solution for Test: Respiration in Plants - 1 - Question 5

The two molecules of pyruvic acid (produced from one glucose molecule during glycolysis). The acetyl CoA then enters a cyclic pathway, tricarboxylic acid cycle, more commonly called as Krebs’ cycle. Thus, acetyl-CoA interconnecting between two cyclic pathways.

Test: Respiration in Plants - 1 - Question 6

In plants, the gaseous exchange take place in:
(a) Stomata
(b) Roots
(c) Stems
(d) Lenticels

Detailed Solution for Test: Respiration in Plants - 1 - Question 6

Plants unlike animals have no special systems for breathing or gaseous exchange. Stomata and lenticels allow gaseous exchange by diffusion.

(a) Stomata: Stomata are tiny openings present on the surface of leaves, primarily on the underside. These openings are surrounded by specialized cells called guard cells. Stomata regulate the exchange of gases, including the intake of carbon dioxide (CO2) for photosynthesis and the release of oxygen (O2) and water vapor (H2O) during transpiration. Stomata play a crucial role in the gas exchange process in plants.

(d) Lenticels: Lenticels are small openings or pores in the bark of woody plant stems. They allow for gaseous exchange between the internal tissues of the stem and the external environment. Lenticels facilitate the exchange of gases, such as oxygen (O2) and carbon dioxide (CO2), in stems and other woody parts of plants.

Test: Respiration in Plants - 1 - Question 7

Which of the following statements are correct?

(A) The oxidation of pyruvic acid molecules formed in glycolysis occurs inside the mitochondria.

(B) Acetyl CoA is a 3-carbon compound.

(C) Under anaerobic conditions, the pyruvic acid formed during glycolysis is reduced to either ethyl alcohol or lactic acid.

(D) Acetyl CoA molecules enter into cyclic reactions during Calvin cycle.

Detailed Solution for Test: Respiration in Plants - 1 - Question 7

Acetyl CoA is a 2-carbon compound and 3-phosphoglycerate molecule enter into cyclic reactions during Calvin cycle.

Test: Respiration in Plants - 1 - Question 8

Aerobic respiration is common in:

Detailed Solution for Test: Respiration in Plants - 1 - Question 8

Aerobic respiration is the process that leads to a complete oxidation of organic substances in the presence of oxygen, and releases carbon dioxide, water and a large amount of energy present in the substrate. This type of respiration is most common in higher organisms.

Aerobic Respiration:

Test: Respiration in Plants - 1 - Question 9

Dough kept overnight in warm place becomes soft and spongy due to:

Detailed Solution for Test: Respiration in Plants - 1 - Question 9

Fermentation is a kind of anaerobic respiration in absence of oxygen to produce ethanol and carbon dioxide gas. Dough kept overnight in warm place becomes soft and spongy due to carbon dioxide gas released during fermentation.

Test: Respiration in Plants - 1 - Question 10

Which of the following reactions is catalysed by the enzyme phosphofructokinase?

Detailed Solution for Test: Respiration in Plants - 1 - Question 10

Phosphofructokinase is a kinase enzyme that phosphorylates fructose-6-phosphate in glycolysis. The enzyme catalysed transfer of a phosphoryl group from ATP is an important reaction in a wide variety of biological processes.

Test: Respiration in Plants - 1 - Question 11

Respiration is:

Detailed Solution for Test: Respiration in Plants - 1 - Question 11

Because the respiratory pathway is involved in both anabolism and catabolism, it would hence be better to consider the respiratory pathway as an amphibolic pathway rather than as a catabolic one.

Test: Respiration in Plants - 1 - Question 12

In animal cells, the first stage of glucose break down is:

Detailed Solution for Test: Respiration in Plants - 1 - Question 12

In animal cells, like muscles during exercise, when oxygen is inadequate for cellular respiration pyruvic acid is reduced to lactic acid by lactate dehydrogenase. The reducing agent is NADH+ and H+ which is reoxidised to NAD+ in both the processes.

Test: Respiration in Plants - 1 - Question 13

In kreb cycle, isocitric acid is converted into α-keto glutaric acid by:

Detailed Solution for Test: Respiration in Plants - 1 - Question 13

Citrate is first isomerised to isocitrate and then followed by decarboxylation, leading to the formation of α-ketoglutaric acid.

Test: Respiration in Plants - 1 - Question 14

When and where anaerobic respiration does occurs in man and yeast?

Detailed Solution for Test: Respiration in Plants - 1 - Question 14

Anaerobic respiration in man occurs in muscle cells during sudden activity in cells to form lactic acid. In yeast anaerobic respiration occurs in absence of oxygen to form ethanol.

Anaerobic Respiration: The Definitive Guide | Biology Dictionary

Test: Respiration in Plants - 1 - Question 15

Krebs cycle is both catabolic and anabolic because it provides

Detailed Solution for Test: Respiration in Plants - 1 - Question 15

During breakdown and synthesis of protein too, respiratory intermediates form the link. Breaking down processes within the living organism is catabolism, and synthesis is anabolism. Because the respiratory pathway (Kreb’s cycle) is involved in both anabolism and catabolism, it would hence be better to consider the respiratory pathway.

Test: Respiration in Plants - 1 - Question 16

F0−F1 particles participate in the synthesis of:

Detailed Solution for Test: Respiration in Plants - 1 - Question 16
  • Oxysomes refer to small round structures present within the folds of the cristae of the inner mitochondrial membrane. It is also known as F0-F1 particles.
  • F0 and F1 particles are found in the inner mitochondrial region and are attached to the cristae and help in ATP production and oxidation.
Test: Respiration in Plants - 1 - Question 17

Cytochrome c is the first electron acceptor in the electron transport chain. Which of the following statements is false about cytochrome c?

Detailed Solution for Test: Respiration in Plants - 1 - Question 17

Cytochrome c is a water soluble protein.

Test: Respiration in Plants - 1 - Question 18

Acetyl CoA forms a 6-C compound after combining with 

Detailed Solution for Test: Respiration in Plants - 1 - Question 18

Acetyl CoA is the connecting link between glycolysis and Kreb's cycle. The end product of glycolysis is pyruvate. It is converted to Acetyl CoA which enters the krebs cycle by combining with oxaloacetic acid (OAA) to form a 6 - C compound citric acid.

Test: Respiration in Plants - 1 - Question 19

Which of the following is performed by coenzyme A?

Detailed Solution for Test: Respiration in Plants - 1 - Question 19

CoA is acetylated to acetyl CoA by the breakdown of carbohydrates through glycolysis and by the breakdown of fatty acids through β-oxidation.

Test: Respiration in Plants - 1 - Question 20

The respiratory quotient(RQ) is defined as:

Detailed Solution for Test: Respiration in Plants - 1 - Question 20

The ratio of the volume of carbon dioxide evolved to the volume of oxygen consumed in respiration is called the respiratory quotient(RQ) or respiratory ratio

Test: Respiration in Plants - 1 - Question 21

Which one is NOT a preparatory phase or energy spending phase of Glycolysis:

Detailed Solution for Test: Respiration in Plants - 1 - Question 21

Formation of pyruvate is not a prerparatory phase or energy spending phase of Glycolysis. In this phase one ATP molecule is released.

Test: Respiration in Plants - 1 - Question 22

Fermentation is:

Detailed Solution for Test: Respiration in Plants - 1 - Question 22

Fermentation is the process of anaerobic respiration in which incomplete oxidation leads to formation of ethanol in absence of oxygen. Fermentation occurs in yeast.

Test: Respiration in Plants - 1 - Question 23

The CORRECT  sequential order of pathway is:

Detailed Solution for Test: Respiration in Plants - 1 - Question 23

There is a sequential, orderly pathway functioning, with one substrate forming the next and with glycolysis, TCA cycle and ETS pathway following one after another.

Test: Respiration in Plants - 1 - Question 24

The respiratory quotient depends upon:

Detailed Solution for Test: Respiration in Plants - 1 - Question 24

The value of R.Q. depends upon the nature of the respiratory substrate (the organic food matter oxidised in respiration) and its oxidation.

Test: Respiration in Plants - 1 - Question 25

What is the number of ATP molecules that can be regarded as a net gain during aerobic respiration of one molecule of glucose? 

Detailed Solution for Test: Respiration in Plants - 1 - Question 25

There can be a net gain of 38 ATP molecules during aerobic respiration of one molecule of glucose. 

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