Photosynthesis in higher plants practice · Mixed difficulty

What is the advantage of light reactions producing ATP and $NADP{H_2}$ on stromal side of thylakoid membrane?

Joseph Priestley observed that when mouse alone was placed in a closed bell jar with burning candle, it was suffocated and candle burning extinguished but when mouse was placed with a mint plant in the same bell jar, that mouse stayed alive and candle continued to burn. What he concluded from this experiment?

Colour that we see in leaves is due to the presence of
I. Chlorophyll-a II. Chlorophyll-b
III. Xanthophyll IV. Carotenoid

Read the following statements and select the correct ones
(i) PS I is involved in non – cyclic photophosphorylation only
(ii) PS II is involved in both cyclic and non –cyclic photophosphorylation
(iii) Stroma lamellae membranes possess PS I only whereas grana lamellae membranes possess both PS I and PS II

In PS I, the reaction centre Chl a has absorption peak at ____whereas in PS II, the reaction centre Chl a has absorption maxima at ______

Photosynthesis convert radient or solar energy into the

The mechanism of ATP formation both in chloroplast and mitochondria is explained by

Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis? It involves:

Assertion: Photorespiration is found in all plants.

Reason : In ${C}_4$ plants, first ${CO}_2$ fixation product is formed in bundle sheath cells.

Factors affecting photosynthesis are
I. number and size of leaves
II. age and orientation of leaves
III. amount of chlorophyll
IV. amount of ${O_2}$ and $C{O_2}$
Select the correct option

With reference to three Calvin cycles, which of the given options is correct for the following question? I. How many gross PGAL molecules are produces? II. Total, how many ATP molecules are required for synthesis of PGAL molecules? II. Total, how many NADPH$_2$ molecules are required for the synthesis of obtained PGAL molecules?

${C_4}$ plants are tolerate to saline conditions due to

Assertion: During the process of photosynthesis amount of organic matter synthesised by producers per unit time and per unit area is referred to as net primary productivity.

Reason: Due to abundance of sunlight primary productivity is usually high and sustained throughout the year in temperate areas.

For yielding one molecule of glucose, the Calvin cycle turns

Photophosphorylation is the

Assertion (A): $C_4$ plants are photosynthetically active than ${C}_3$ plants.

Reason (R): Photorespiration is very high in ${C}_4$ Plants.

In the majority of dicots, the first stable product of photosynthesis during the dark reaction is

The process which makes major difference between ${C_3}$ and ${C_4}$ plants is

Choose the correct statements among the following

(A) Chlorophyll is the major pigment responsible for trapping of light, accessory pigment also participate

(B) In green plants, $\mathrm{H}_2 \mathrm{O}$ is the hydrogen donor

(C) In purple sulphur bacteria the oxidation product is carbon

(D) Radioisotope studies proved water as source of $\mathrm{O}_2$ release in photosynthesis

In a crop field a weedicide is used to remove weeds in order to increase the yield. But the effect of this weedicide is that, it blocks electron transport from photosystem II to photosystem I. This will result in

Which would do maximum harm to a tree?

The enzymatic reactions incorporate $C{O_2}$ into the plants leading to the synthesis of sugar in

What is true for photosynthesis?

Photosynthesis is an important process for life on earth because

I. Tomato

II. Black pepper

III. Mango

From the above option choose the correct answer in
respect of greenhouse crops

Which hypothesis best explains the synthesis of ATP in chloroplast?

Given below are two statements:
Statement I: The primary $\mathrm{C}{\mathrm{O}_\mathrm{2}}$ acceptor in ${\mathrm{C}_\mathrm{4}}$ plants phosphoenolpyruvate and is found in the mesophyll cells.
Statement II: Mesophyll cells of ${\mathrm{C}_\mathrm{4}}$ plants lack RuBisCo enzyme
In the light of the above statements, choose the correct answer from the options given below:

Rubisco has the active site that binds to

In ${C_3}$ cycle the primary $C{O_2}$ acceptor is?

The law of limiting factors was proposed with particular reference to photosynthesis. Identify the scientist, who proposed this law?