AIIMS Biology Photosynthesis In Higher Plants Class 11 Questions

Photorespiration shows formation of

Which of the following is correctly labelled for the given figure?

Kranz anatomy is usually associated with

PS⁻II occurs only in

Which of the following statements is correct?

Assertion : Protons or hydrogen ions produced by photolysis of water accumulate in the lumen of thylakoids. Reason : Photolysis of water takes place in inner membrane of thylakoid.

Cyclic photophosphorylation involves

The first stable product of Calvin cycle is

Assertion: Due to pollution atmospheric concentration of CO₂ is increasing which will be harmful for C₃ plants whereas productive for C₄ plants. Reason: C₄ plants have greater efficiency for CO₂ as CO₂ is fixed by PEP oxygenase.

What is PAR range?

Assertion (A) : Dark reaction is purely enzymatic reaction. Reason (R) : It occurs only in absence of light.

Assertion : Under conditions of high light intensity and limited CO₂ supply, photorespiration has a useful role in protecting the plants from photo-oxidative damage. Reason : If enough CO₂ is not available to utilize light energy for carboxylation to proceed, the excess energy may not cause damage to plants.

Assertion : Photosynthetically C₄ plants are less efficient than C₃ plants. Reason : The operation of C₄ pathway requires the involvement of only bundle-sheath cells.

Assertion : C₄ photosynthetic pathway is more efficient than the C₃ pathway. Reason : Photorespiration is suppressed in C₄ plants.

Assertion : The atmospheric concentration of CO₂ at which photosynthesis just compensates for respiration is referred to as CO₂ compensation point. Reason : The CO₂ compensation point is reached when the amount of CO₂ uptake is less than that generated through respiration because the level of CO₂ in the atmosphere is more than that required for achieving CO₂ compensation point.

Which one of the following categories of organisms do not evolve oxygen during photosynthesis?

Assertion : Cyclic pathway of photosynthesis first appeared in some eubacterial species. Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved.

Photorespiration in C₃ plants starts from:

Hill reaction occurs in:

Assertion : Rhoeo leaves contain anthocyanin pigments in epidermal cells. Reason : Anthocyanins are accessory photosynthetic pigments.

The photorespiratory carbon-oxidation cycle involves the interaction of

Assertion : In bacteria, photosynthesis occurs by utilizing wavelengths longer than 700 nₘ. Reason : Here the reaction centre is B^{-890}.

Assertion : When six molecules of carbon dioxide participate in photosynthesis, 12 molecules of NADPH + H⁺ and 18 ATP are used up, forming one hexose molecule. Reason : The photosynthetic light reaction results in the formation of ATP and NADPH₂.

Photorespiration, usually occurs in:-

Which of the following statements about phytochrome is true?

Blackman's law is related to

Classical experiment to prove essentiality of CO₂ for photosynthesis was given by

Photosynthetic bacteria do not contain

The molecule which mainly absorb light energy and convert it to chemical energy in photosynthesis are

The most important source of energy on earth is