Tag: life processes in living organisms- part 1

Questions Related to life processes in living organisms- part 1

Which of the following is necessary for respiration in plants?

factors affecting respiration living organisms and energy production life processes in living organisms- part 1 respiration biology

  1. Carbon dioxide

  2. Oxygen

  3. Chlorophyll

  4. Light

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Correct Option: B
Explanation:

Oxygen is the final electron electron acceptor in the electron transport chain, which occurs in the mitochondria. So, for aerobic respiration oxygen is must. Respiration decreases with decreased available oxygen. Under circumstances where no oxygen is present, like in poorly draining soil, anaerobic respiration (fermentation) occurs.

If the naked pea seeds are kept in four respiratory flasks, they would germinate best in the flask which contains

factors affecting respiration living organisms and energy production life processes in living organisms- part 1 respiration biology

  1. Carbon dioxide

  2. Oxygen

  3. Hydrogen

  4. Nitrogen

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Correct Option: B
Explanation:
Germination is a process of sprouting of seeds which later develops into a new plant. There are several factors which play vital role in the germination process. Theses are water, temperature, oxygen and light. During the process of germination, initially, the seed absorbs water. Later, the swollen seed respires that requires oxygen. Hence, when naked pea seeds are kept in a flask containing oxygen, it shows the best germination. 
Thus, the correct answer is option B.
Identify the correct terms for the given statements and select the correct answer.

(i) Sudden increase in the rate of respiration during ripening of fruits.
(ii) Reduction in the consumption of respiratory substrate when mode of respiration is changed from anaerobic to aerobic
(iii) Respiratory oxidation of carbohydrates and fats.

factors affecting respiration living organisms and energy production life processes in living organisms- part 1 respiration biology

  1. Pasteur effect- (i) ; Floating respiration -(ii) ; Climacteric respiration- (iii)

  2. Pasteur effect- (ii) ; Floating respiration -(iii) ; Climacteric respiration- (i)

  3. Pasteur effect- (iii) ; Floating respiration -(ii) ; Climacteric respiration- (i)

  4. Pasteur effect- (ii) ; Floating respiration -(i) ; Climacteric respiration- (iii)

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Correct Option: B

Which one of the following organisms may respire in the absence of oxygen?

factors affecting respiration living organisms and energy production life processes in living organisms- part 1 respiration biology

  1. Azotobacter

  2. Clostridium

  3. Rhizobium

  4. Lactobacillus

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Correct Option: B
Explanation:

Obligate anaerobic beings are those that cannot survive when oxygen is present. Some fungi, some bacteria (like the agent of botulism -Clostridium botulinum, and the agent of tetanus- Clostridium tetani) and some protozoans are examples of obligate anaerobes.


For aerobic respiration to occur

factors affecting respiration living organisms and energy production life processes in living organisms- part 1 respiration biology

  1. Pyruvate must be transported to the mitochondrion

  2. Oxygen must be available to the mitochondrion

  3. Hydrogen ions released from the breakdown of pyruvate must be carried to the electron transport system

  4. All of the above

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Correct Option: D
Explanation:

  • Aerobic respiration is the process that takes place in the presence of oxygen.
  • The first part of the process is where the molecule of glucose is broken down to 2 molecules of pyruvate by the process of glycolysis
  • These pyruvate molecules are to enter the mitochondria to under go the reaction of kerb cycle, but the molecule of pyruvate itself cannot enter the mitochondria, it is converted to acetyl CoA so that it can enter inside the mitochondrion membrane.
  • After the kerb cycle molecules of NADH and $FADH _2$are formed which enter the ETS and undergo oxidative phosphorylation.
  • Hydrogen ions are released from the NADH and $FADH _2$ molecules which are transported from inner membrane of mitochondria to the intermembrane matrix of mitochondria, this builds a concentration gradient across the membrane. Also the hydron ions and the electrons that are transported by the complexs of the ETS are in the end accepted by the oxygen molecule forming water that is why it is known as oxidative phosphorylation
  • The concentration gradient that is made is used for the transport of hydronium ions across the ATP synthase complex of the inner mitochrondrial membrane. 
  • With the transport of 2 hydrogen ions one molecule of ATP is formed.
  • Thus glycolysis which takes place in cytoplasm, Kerb cycle that takes place in mitochondria , oxidative phosphorylation and chemisomotic phosphorylation are the parts of aerobic respiration.
  • Therefore the answer 'All of the above' is correct.

















CAM plants are mostly

factors affecting respiration living organisms and energy production life processes in living organisms- part 1 respiration biology

  1. Tropical plants

  2. Succulents

  3. Monocots

  4. Mangroves

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Correct Option: B
Explanation:

CAM (Crassulacean Acid Metabolism) is a pathway of photosynthesis which occurs in desert succulents, which have a low surface-to-volume ratio. In this pathway of photosynthesis carbon is fixed during night time while decarboxylation reaction takes place at day time..

So, the correct option is 'succulents'

Which of the following forms the connecting link between glycolysis and Kreb's cycle?

biology life processes in living organisms- part 1 amphibolic pathway living organisms and energy production respiration in plants

  1. Glucose

  2. Ethyl alcohol

  3. Lactic acid

  4. Pyruvic acid

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Correct Option: D
Explanation:
Pyruvic acid is produced as a final end product of glycolysis. This pyruvic acid then forms acetyl CoA. This acetyl CoA, acts as initial compound of Kreb's cycle.
So, the correct answer is 'Pyruvic acid'

The details of tricarboxylic acid pathway was worked out by

biology respiration in plants amphibolic pathway living organisms and energy production life processes in living organisms- part 1

  1. Miescher

  2. Hans Krebs

  3. Pasteur

  4. None of the above

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Correct Option: B
Explanation:

Sir Hans Adolf Krebs was a German born British physician and biochemist. He was the pioneer scientist in study of cellular respiration, a biochemical pathway in cells for production of energy.

Out of 38 molecules of ATP produced after aerobic respiration of glucose, the break up in ATP production in glycolysis (P). pyruvic acid to acetyl CoA formation (Q) and Krebs cycle (R) is 

biology respiration in plants amphibolic pathway living organisms and energy production life processes in living organisms- part 1

  1. P = 2, Q = 6, R = 30

  2. P = 8, Q = 6, R = 24

  3. P = 8, Q = 10, R = 20

  4. P = 2, Q = 12, R = 24

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Correct Option: B

Aerobic respiratory pathway is appropriate termed ___________.

biology respiration in plants amphibolic pathway living organisms and energy production life processes in living organisms- part 1

  1. Anabolic

  2. Catabolic

  3. Amphibolic

  4. Parabolic

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Correct Option: C