285190
In some succulent plants like Opuntia the R. Q. is zero because
1 $\text{C}{{\text{O}}_{2}}$ is released without any absorption of ${{\text{O}}_{2}}$.
2 ${{\text{O}}_{2}}$ is absorbed but $\text{C}{{\text{O}}_{2}}$ is not released.
3 there is often compensation point in these plants due to thick phylloclades.
4 none of the above
Explanation:
(b) In succulent plants like Opuntia there is an incomplete oxidation of the carbohydrates resulting in the formation of organic acids. $\text{C}{{\text{O}}_{2}}$ is not released. $2{{\text{C}}_{6}}{{\text{H}}_{12}}{{\text{O}}_{6}}+3{{\text{O}}_{2}}3{{\text{C}}_{4}}{{\text{H}}_{6}}{{\text{O}}_{5}}+3{{\text{H}}_{2}}\text{O}+386\text{kcal}$. R.Q. $=\frac{\text{C}{{\text{O}}_{2}}}{{{\text{O}}_{2}}}=\frac{0}{3}=0$
NCERT Page-236 / N-164
Respiration in Plants
285191
Refer the given equation and answer the question.
$2\left( {{\text{C}}_{51}}{{\text{H}}_{98}}{{\text{O}}_{6}} \right)+145{{\text{O}}_{2}}\xrightarrow[{}]{{}}102\text{C}{{\text{O}}_{2}}+98{{\text{H}}_{2}}\text{O}+$ Energy
The R.Q of above reaction is
1 1
2 0.7
3 1.45
4 1.62
Explanation:
(b) The ratio of the volume of $\text{C}{{\text{O}}_{2}}$ liberated to the volume of oxygen absorbed per molecule during respiration is called Respiratory Quotient (RQ). The value of $RQ$ indicates the types of respiratory substrate.
$\text{RQ}=\frac{\text{ }\!\!~\!\!\text{ Volume }\!\!~\!\!\text{ of }\!\!~\!\!\text{ C}{{\text{O}}_{2}}\text{ }\!\!~\!\!\text{ evolved }\!\!~\!\!\text{ }}{\text{ }\!\!~\!\!\text{ Volume }\!\!~\!\!\text{ of }\!\!~\!\!\text{ }{{\text{O}}_{2}}\text{ }\!\!~\!\!\text{ consumed }\!\!~\!\!\text{ }}$
$\text{RQ}=\frac{102}{145}=0.7$
NCERT Page-236 / N-164
Respiration in Plants
285192
Which of the following can be considered as respiratory substrates?
(1) Proteins
(2) Fats
(3) Organic Acids
(4) Carbohydrates
Select the correct answer from the codes given below:
1 (1) and (4) only
2 (2) and (4) only
3 (1), (2) and (4) only
4 All of the above
Explanation:
(d) The compounds that are oxidised during respiration are known as respiratory substrates e.g. carbohydrates, proteins, fats and organic acids etc.
285190
In some succulent plants like Opuntia the R. Q. is zero because
1 $\text{C}{{\text{O}}_{2}}$ is released without any absorption of ${{\text{O}}_{2}}$.
2 ${{\text{O}}_{2}}$ is absorbed but $\text{C}{{\text{O}}_{2}}$ is not released.
3 there is often compensation point in these plants due to thick phylloclades.
4 none of the above
Explanation:
(b) In succulent plants like Opuntia there is an incomplete oxidation of the carbohydrates resulting in the formation of organic acids. $\text{C}{{\text{O}}_{2}}$ is not released. $2{{\text{C}}_{6}}{{\text{H}}_{12}}{{\text{O}}_{6}}+3{{\text{O}}_{2}}3{{\text{C}}_{4}}{{\text{H}}_{6}}{{\text{O}}_{5}}+3{{\text{H}}_{2}}\text{O}+386\text{kcal}$. R.Q. $=\frac{\text{C}{{\text{O}}_{2}}}{{{\text{O}}_{2}}}=\frac{0}{3}=0$
NCERT Page-236 / N-164
Respiration in Plants
285191
Refer the given equation and answer the question.
$2\left( {{\text{C}}_{51}}{{\text{H}}_{98}}{{\text{O}}_{6}} \right)+145{{\text{O}}_{2}}\xrightarrow[{}]{{}}102\text{C}{{\text{O}}_{2}}+98{{\text{H}}_{2}}\text{O}+$ Energy
The R.Q of above reaction is
1 1
2 0.7
3 1.45
4 1.62
Explanation:
(b) The ratio of the volume of $\text{C}{{\text{O}}_{2}}$ liberated to the volume of oxygen absorbed per molecule during respiration is called Respiratory Quotient (RQ). The value of $RQ$ indicates the types of respiratory substrate.
$\text{RQ}=\frac{\text{ }\!\!~\!\!\text{ Volume }\!\!~\!\!\text{ of }\!\!~\!\!\text{ C}{{\text{O}}_{2}}\text{ }\!\!~\!\!\text{ evolved }\!\!~\!\!\text{ }}{\text{ }\!\!~\!\!\text{ Volume }\!\!~\!\!\text{ of }\!\!~\!\!\text{ }{{\text{O}}_{2}}\text{ }\!\!~\!\!\text{ consumed }\!\!~\!\!\text{ }}$
$\text{RQ}=\frac{102}{145}=0.7$
NCERT Page-236 / N-164
Respiration in Plants
285192
Which of the following can be considered as respiratory substrates?
(1) Proteins
(2) Fats
(3) Organic Acids
(4) Carbohydrates
Select the correct answer from the codes given below:
1 (1) and (4) only
2 (2) and (4) only
3 (1), (2) and (4) only
4 All of the above
Explanation:
(d) The compounds that are oxidised during respiration are known as respiratory substrates e.g. carbohydrates, proteins, fats and organic acids etc.
285190
In some succulent plants like Opuntia the R. Q. is zero because
1 $\text{C}{{\text{O}}_{2}}$ is released without any absorption of ${{\text{O}}_{2}}$.
2 ${{\text{O}}_{2}}$ is absorbed but $\text{C}{{\text{O}}_{2}}$ is not released.
3 there is often compensation point in these plants due to thick phylloclades.
4 none of the above
Explanation:
(b) In succulent plants like Opuntia there is an incomplete oxidation of the carbohydrates resulting in the formation of organic acids. $\text{C}{{\text{O}}_{2}}$ is not released. $2{{\text{C}}_{6}}{{\text{H}}_{12}}{{\text{O}}_{6}}+3{{\text{O}}_{2}}3{{\text{C}}_{4}}{{\text{H}}_{6}}{{\text{O}}_{5}}+3{{\text{H}}_{2}}\text{O}+386\text{kcal}$. R.Q. $=\frac{\text{C}{{\text{O}}_{2}}}{{{\text{O}}_{2}}}=\frac{0}{3}=0$
NCERT Page-236 / N-164
Respiration in Plants
285191
Refer the given equation and answer the question.
$2\left( {{\text{C}}_{51}}{{\text{H}}_{98}}{{\text{O}}_{6}} \right)+145{{\text{O}}_{2}}\xrightarrow[{}]{{}}102\text{C}{{\text{O}}_{2}}+98{{\text{H}}_{2}}\text{O}+$ Energy
The R.Q of above reaction is
1 1
2 0.7
3 1.45
4 1.62
Explanation:
(b) The ratio of the volume of $\text{C}{{\text{O}}_{2}}$ liberated to the volume of oxygen absorbed per molecule during respiration is called Respiratory Quotient (RQ). The value of $RQ$ indicates the types of respiratory substrate.
$\text{RQ}=\frac{\text{ }\!\!~\!\!\text{ Volume }\!\!~\!\!\text{ of }\!\!~\!\!\text{ C}{{\text{O}}_{2}}\text{ }\!\!~\!\!\text{ evolved }\!\!~\!\!\text{ }}{\text{ }\!\!~\!\!\text{ Volume }\!\!~\!\!\text{ of }\!\!~\!\!\text{ }{{\text{O}}_{2}}\text{ }\!\!~\!\!\text{ consumed }\!\!~\!\!\text{ }}$
$\text{RQ}=\frac{102}{145}=0.7$
NCERT Page-236 / N-164
Respiration in Plants
285192
Which of the following can be considered as respiratory substrates?
(1) Proteins
(2) Fats
(3) Organic Acids
(4) Carbohydrates
Select the correct answer from the codes given below:
1 (1) and (4) only
2 (2) and (4) only
3 (1), (2) and (4) only
4 All of the above
Explanation:
(d) The compounds that are oxidised during respiration are known as respiratory substrates e.g. carbohydrates, proteins, fats and organic acids etc.
