Home
Class 12
BIOLOGY
A : Assimilatory power in photosynthesis...

A : Assimilatory power in photosynthesis is generated in ETS occuring in thylakoid membrane.
R: They are needed for `CO_(2)` reduction and RuBP regeneration.

A

If both Assertion % Reson ar true and the reason is the correct explanation of the asserition the mark (1)

B

If both Assertion % Reason are true but the reason, is not the correct explanation of the assertion ,then mark (2)

C

If Assetion is true statement but Reason is false , The mark (3)

D

If both Assertion and Reason are false statements, the mark (4)

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the assertion and reason provided in the question, we will break down the statements and evaluate their validity step by step. ### Step 1: Understanding the Assertion The assertion states: "Assimilatory power in photosynthesis is generated in the electron transport chain occurring in the thylakoid membrane." - **Explanation**: In photosynthesis, the light-dependent reactions occur in the thylakoid membranes of chloroplasts. During these reactions, light energy is captured and used to generate ATP and NADPH, which are collectively referred to as the "assimilatory power." This process involves the electron transport chain (ETS), where electrons are transferred through a series of proteins, leading to the production of ATP and NADPH. ### Step 2: Evaluating the Assertion - **Validity**: The assertion is **true** because the assimilatory power (ATP and NADPH) is indeed generated in the thylakoid membrane during the light reactions of photosynthesis. ### Step 3: Understanding the Reason The reason states: "They are needed for CO2 reduction and RuBP regeneration." - **Explanation**: The ATP and NADPH produced in the light reactions are used in the Calvin cycle (also known as the dark reactions) to fix carbon dioxide (CO2) and regenerate ribulose bisphosphate (RuBP). This process is essential for synthesizing glucose and other carbohydrates. ### Step 4: Evaluating the Reason - **Validity**: The reason is also **true** because ATP and NADPH are required for the reduction of CO2 and the regeneration of RuBP in the Calvin cycle. ### Step 5: Analyzing the Relationship Now we need to determine if the reason correctly explains the assertion. - **Connection**: While both statements are true, the reason does not directly explain how the assimilatory power is generated. The assertion focuses on the generation of ATP and NADPH in the thylakoid membrane, while the reason discusses their use in the Calvin cycle. Therefore, the reason is not a correct explanation of the assertion. ### Conclusion Based on the evaluations: - **Assertion**: True - **Reason**: True - **Relationship**: The reason is not the correct explanation for the assertion. Thus, the correct option is: **Both assertion and reason are true, but the reason is not the correct explanation for the assertion.**
Promotional Banner

Topper's Solved these Questions

  • PHOTOSYNTHESIS IN HIGHER PLANTS

    AAKASH INSTITUTE ENGLISH|Exercise Assignment(Section C)|60 Videos

  • ORGANISMS AND POPULATIONS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT (SECTION-D) (Assertion-Reason Type Questions)|15 Videos

  • PLANT GROWTH AND DEVELOPMENT

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT (SECTION -D)|10 Videos

Similar Questions

Explore conceptually related problems

Assertion: Assimilotary power in photosynthesis is generated in ETS occuring in thylakoid membrane . Reason : They are needed for CO_(2) reduction.

A: The first step towards photosynthesis is reduction of CO_2 . R:ATP is released by the reduction of CO_2 .

[A]: The energy capturing part of photosynthesis occurs in thylakoid membranes and can not proceed without solar energy. [R]: The synthesis part of photosynthesis occurs in the stroma and does not require direct light energy.

[A]: Photosynthesis is an oxidation reduction process. [R]: Electron transport involves oxidation & dark reaction involves reduction of CO_2

Assertion. The atmospheric concentration of CO_(2) at which photosynthesis just compensates for respiration is referred to as CO_(2) compensation point. Reason. CO_(2) -compensation point is reached when the amount of CO_(2) uptake is less than that generated through respiration because the level of CO_(2) is more than that required for achieving CO_(2) -compensation point.

In the dark reaction of photosynthesis , assimilatory power is used for the reduction of

[A]: Oxidation of H_2O takes place during pho- tosynthesis. [R]: Photosynthesis is an oxidation-reduction process where H_2O is oxidised to O_2 and CO_2 is reduced to (CH_2O)_(n) ·

Read the following statements and mark the correct option- (i)Grana lamellae have both PS-I and PS-II. (ii) ph inside the thylakoid lumen decreases when H^+ gradient is established across thlakoid membrane (iii) During reduction of NADP to NADPH + H^+ protons are removed from thylakoid lumen (iv) Melvin Calvin used radioctive 14^C in a dicot plant to elucidate path of carbon in biosynthetic phase of photosynthesis.

The C_(4) plants are photosynthesis more efficient then C_(3) plant because (a) The CO_(2) efflux is not prevented (b) They have more chloroplasts (c) The CO_(2) compensation point is more. (d) CO_(2) generated during photorespiration is trapped and recycled through PEP carboxylase

Consider the following five statement ( A to E ) w.r.t. Chloroplast shown below. Select the correct option statin which ones . Are True ( T) and which ones are False ( F ) A. It is impermeable and lacks porins. B. it is selectively permeable having carrier proteins for transport. C. Stacked thylakoids one over other which is the site production of assimilatory power. D. Present between two grana and contains enzymes of dark reaction. E.It contains enzymes for the synthesis of sugar and proteins.