Respiration in Plants - Online Test
Q1. Aerobic respiration is common in
Answer : Option D
Explaination / Solution:
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.
Q2. In kreb cycle, isocitric acid is converted into α-keto glutaric acid by
Answer : Option D
Explaination / Solution:
Citrate is first isomerised to isocitrate and then followed by decarboxylation, leading to the formation of α-ketoglutaric acid.
Q3. In Kreb cycle conversion of succinyl-CoA to succinic acid by
Answer : Option A
Explaination / Solution:
Conversion of Succinyl-CoA to Succinate : Succinyl-CoA, like acetyl-CoA, has a strongly negative free energy of hydrolysis of its thioester bond In the next step of the citric acid cycle, energy released in the breakage of this bond is used to drive the synthesis of a phosphoanhydride bond in either GTP or ATP, and succinate is also formed in the process.
The enzyme that catalyzes this reversible reaction is called either succinyl-CoA synthetase or succinic thiokinase;
Q4. Two molecules of pyruvate are completely degraded in Krebs cycle to form
Answer : Option A
Explaination / Solution:
In kreb cycle glucose has been broken down to release carbon dioxide and eight molecules of NADH2; two of FADH2 have been synthesised besides just two molecules of ATP.
Q5. Fermentation is
Answer : Option C
Explaination / Solution:
Fermentation is the process of anaerobic respiration in which incomplete oxidation leads to formation of ethanol in absence of oxygen. Fermentation occurs in yeast.
Q6. Number of glucose molecule required to produce 38 ATP under anaerobic condition is
Answer : Option C
Explaination / Solution:
During anaerobic respiration only two molecules of ATP is produced by each molecules of glucose.
So, 19 glucose molecules are required to produce 38 ATP molecules.
Q7. Cellular respiration first takes place in
Answer : Option C
Explaination / Solution:
Cellular respiration takes place in two steps- Glycolysis and Kreb’s cycle. Glycolysis occurs in cytoplasm of cells and Kreb’s cycle in mitochondria. So, first step of respiration takes place in cytoplasm.
Q8. Lactic acid is formed by the process of
Answer : Option C
Explaination / Solution:
Lactic acid is formed by the process of incomplete oxidation of glucose in presence of insufficient oxygen. Lactic acid is formed in muscle cells due to incomplete oxidation to cause cramps.
Q9. In mitochondria, protein accumulate in
Answer : Option B
Explaination / Solution:
In mitochondria, protein accumulate in intermembrane space between two layers of mitochondria.
Q10. Energy releasing enzymatically controlled catabolic process which involves step-wise oxidative breakdown of organic substance inside living cells is called
Answer : Option B
Explaination / Solution:
Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.
