Tag: life processes in living organisms- part 1

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Questions Related to life processes in living organisms- part 1

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

Which of the following is necessary for respiration in plants?

  1. Carbon dioxide

  2. Oxygen

  3. Chlorophyll

  4. Light
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Carbon dioxide

  2. Oxygen

  3. Hydrogen

  4. Nitrogen
Reveal answer Fill a bubble to check yourself
B Correct answer
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.
Multiple choice factors affecting respiration living organisms and energy production life processes in living organisms- part 1 respiration biology
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.

  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)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Climacteric respiration (i) is the sudden increase in respiration during fruit ripening. Pasteur effect (ii) is the inhibition of glycolysis by oxygen. Floating respiration (iii) is the oxidation of non-respiratory substrates like carbohydrates and fats.

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

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

  1. Azotobacter

  2. Clostridium

  3. Rhizobium

  4. Lactobacillus
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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


For aerobic respiration to occur

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

















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

CAM plants are mostly

  1. Tropical plants

  2. Succulents

  3. Monocots

  4. Mangroves
Reveal answer Fill a bubble to check yourself
B Correct answer
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'

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

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

  1. Glucose

  2. Ethyl alcohol

  3. Lactic acid

  4. Pyruvic acid
Reveal answer Fill a bubble to check yourself
D Correct answer
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'
Multiple choice biology respiration in plants amphibolic pathway living organisms and energy production life processes in living organisms- part 1

The details of tricarboxylic acid pathway was worked out by

  1. Miescher

  2. Hans Krebs

  3. Pasteur

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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 

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Glycolysis produces 8 ATP (2 net ATP + 2 NADH yielding 6 ATP via shuttle), link reaction produces 6 ATP (2 NADH), and the Krebs cycle produces 24 ATP (6 NADH, 2 FADH2, 2 GTP/ATP). The total is 38 ATP.

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

Aerobic respiratory pathway is appropriate termed ___________.

  1. Anabolic

  2. Catabolic

  3. Amphibolic

  4. Parabolic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Respiration is called amphibolic because it involves both catabolic processes (breakdown of substrates to release energy) and anabolic processes (use of respiratory intermediates for biosynthesis).