Tag: plant respiration

Questions Related to plant respiration

The breakdown of pyruvate to give carbon dioxide, water and energy takes place in

zoology respiratory system do plants breathe? plant respiration respiration-plants

  1. Cytoplasm

  2. Mitochondria

  3. Chloroplast

  4. Nucleus

Show answer
Correct Option: B

Select the correct option:

Mercury (Hg) is generally used in anaerobic respiration experiments because it does not react with ___________.

zoology respiratory system do plants breathe? plant respiration respiration-plants

  1. ${O} _{2}$

  2. ${CO} _{2}$

  3. ${H} _{2}O$

  4. $air$

Show answer
Correct Option: C
Explanation:
Mercury is very reactive towards oxygen. It reacts with the oxygen in the air and also reacts with dilute acids containing oxygen. However, mercury is comparatively non-reactive in water. This is why it is used in anaerobic respiration experiments.
So, the correct answer is '$H _2$O'

2 NADH $(H^+)$ produced during anaerobic glycolysis yield

zoology respiratory system do plants breathe? plant respiration respiration-plants

  1. 6 ATP molecules

  2. 4 ATP molecules

  3. 8 ATP molecules

  4. None of the above

Show answer
Correct Option: D
Explanation:

The process of glycolysis yields 2 net ATPs and 2 NADH molecules. NADH is converted into ATP in mitochondrial electron transport chain if oxygen is present. In anaerobic respiration, there is no oxygen available so NADH does not lead to the formation of ATP molecules. Without oxygen, NADH builds up and the cell can run out of NAD. Without NAD glycolysis stops. To regenerate NAD, cells with anaerobic respiration carry out the process of fermentation in which NADH gets converted into NAD to restart glycolysis. 

Thus, the correct answer is option D. 

Leaves of the plant have tiny pores for exchange of oxygen and carbon dioxide. These small pores are known as

biology respiration in organism do plants breathe? plant respiration respiration-plants

  1. Nodule

  2. Stomata

  3. Radicle

  4. None of the above

Show answer
Correct Option: B
Explanation:

In plants, the stoma is a tiny opening found on the under-surface of leaves. These pores provide the passage for the entry of the air and the exchange of gases. They are also useful during transpiration for the escape of water vapour into the atmosphere.

So the correct option is 'Stomata'

Plants take in .......... from the air and give out ..........

biology respiration in organism do plants breathe? plant respiration respiration-plants

  1. Oxygen, Carbon dioxide

  2. Carbon dioxide, Oxygen

  3. Oxygen, Nitrogen

  4. None of the above

Show answer
Correct Option: B
Explanation:

Plants perform photosynthesis to obtain the light energy from direct sunlight and convert it into chemical energy. This process utilizes carbon dioxide, water and sunlight to produce carbohydrates and oxygen. It acts as a counterbalance to respiration by utilizing the carbon dioxide generated by all breathing organisms and giving out the oxygen back to the atmosphere. 

So the correct option is ' Carbon Dioxide, Oxygen'

When yeast and sugar solution are left to stand without oxygen for some time they develop a characteristic smell due to the production of new compound, which is

zoology respiratory system do plants breathe? plant respiration respiration-plants

  1. Ethanol

  2. Ammonia

  3. Carbondioxide

  4. Sodium carbonate

Show answer
Correct Option: A
Explanation:
When yeast has both sugar and oxygen available to it, it undergoes aerobic respiration to produce energy, water and carbon dioxide. In the absence of oxygen, yeast switches over to a process called anaerobic respiration. During which, sugar is fermented to produce energy, carbon dioxide, and ethanol. Yeast that produces ethanol from the sugar has a characteristic smell and this process is generally used to ferment wine.
So, the correct answer is 'Ethanol'.

The growth of which group of bacteria will be slow in comparison to the others?

zoology respiratory system do plants breathe? plant respiration respiration-plants

  1. Obligate aerobes

  2. Obligate anaerobes

  3. Facultative aerobes

  4. Facultative anaerobes

Show answer
Correct Option: A
Explanation:
  • The growth of Obligate aerobes will be slow in comparison to the other bacteria.
  • These group of bacteria require oxygen to grow as they cannot respire anaerobically.
  • Its growth depends on aerobic respiration and use oxygen as a terminal electron acceptor.
  • The correct answer is OPTION A.

State if the following statements are True or False. Correct the False statement.


1. Photosynthesis and respiration take place all the time in plants.
2. For respiration, sunlight and chlorophyll are needed.
3. In old stems, gaseous exchange takes place through the stomata.
4. Photosynthesis occurs only in chlorophyll-containing plants.
5. Respiration which requires oxygen is known as anaerobic respiration.
6. Aerobic respiration takes place in the absence of oxygen.

zoology respiratory system do plants breathe? plant respiration respiration-plants

  1. True

  2. False

Show answer
Correct Option: A
Explanation:
Correct statements
1. Photosynthesis and respiration take place all the time in plants.
2. For respiration, sunlight and chlorophyll are needed.
3. In stem and plants, gaseous exchange take place through the stomata.
4. Photosynthesis occurs only in chlorophyll containing plants.
5. Respiration which requires oxygen is known as Aerobic respiration.
6. Anarobic respiration takes place in the absence of oxygen.

Which of the following is a direct oxidation pathway performed without glycolysis cycle?

zoology respiratory system do plants breathe? plant respiration respiration-plants

  1. HMP pathway

  2. TCA

  3. Both of  A and B

  4. None of the above

Show answer
Correct Option: A
Explanation:

The HMP pathway or pentose phosphate pathway that produces 5 carbon compound and NADPH in the form of energy. Additionally, these pathways can operate in the anabolic direction to transform glycolytic intermediates into other compounds. So, HMP pathway is a  direct oxidation pathway performed without glycolysis cycle. HMP shunt produces some glycolytic intermediated like glyceraldehyde-3-phosphate and fructose-6-phosphate that can directly involve in the glycolysis pathway or EMP. Thus, the correct answer is option A.

In what condition hydrolysis of complex organic compounds take place?

zoology respiratory system do plants breathe? plant respiration respiration-plants

  1. Normal conditions

  2. Aerobic Conditions

  3. Anaerobic conditions

  4. Extreme Conditions

Show answer
Correct Option: C