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Test: What is Photosysnthesis (June 15) - NEET MCQ


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Test: What is Photosysnthesis (June 15) - Question 1

The synthesis of complex organic substances from simple inorganic raw materials in the presence of sunlight and chlorophyll is called ..........., which is a ............ process.

Detailed Solution for Test: What is Photosysnthesis (June 15) - Question 1

Photosynthesis is an enzyme regulated anabolic process which involves the synthesis of organic compounds, inside the chlorophyll containing cells, from CO2 and H2O with the help of sunlight as a source of energy. Oxygen evolved during photosynthesis comes from water. The equation for photosynthesis can be summarised as follows.

Test: What is Photosysnthesis (June 15) - Question 2

Who demonstrated that green plants purify the foul air produced by breathing animals and burning candles?

Detailed Solution for Test: What is Photosysnthesis (June 15) - Question 2

Joseph Priestley (1770) observed that a candle burning in a closed space a bell jar, soon gets extinguished. Similarly. A mouse kept in a closed space would soon get suffocated and die However, when he placed a mint plant and candle continued to burn. Priestley hypotesised that four air or phologiston produced during burning of candles or animal (mice) respiration could be converted into pure air or dephlogiston by plants (mint). In 1774, Priestley discovered oxygen.

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Test: What is Photosysnthesis (June 15) - Question 3

Which of the following scientist concluded by his experiments that green plants play a role in purifying the noxious air only in the presence of sunlight?

Detailed Solution for Test: What is Photosysnthesis (June 15) - Question 3

Jan Ingenhousz (1730-1799), In his experiment with an aquatic plant, showed that in bright sunlight, small bubble were formed around the green parts while in the dark no such bubbles formed He found out these bubbles to be of oxygen He thus, cnfirmed that purification of air or formation of dephlogiston is carried out by green plants only in presents of sunlight.

Test: What is Photosysnthesis (June 15) - Question 4

Who provided the evidence that glucose is formed during photosynthesis and is then stored in the form of starch?

Detailed Solution for Test: What is Photosysnthesis (June 15) - Question 4

Sachs (1854) provided the evidence that green plant parts produce glucose which is stored in the form of starch. Starch is the first visible product of photosynthesis.

Test: What is Photosysnthesis (June 15) - Question 5

Who used a prism, green alga Cladophora and aerobic bacteria and plotted the first action spectrum for photosynthesis?

Detailed Solution for Test: What is Photosysnthesis (June 15) - Question 5

Engelmann (1843-1909) split light into components by the prism and then illuminated Cladophora (a green alga) was placed in a suspension of aerobic bacteria. He found that bacteria accumulated in the region of blue and red light of the split spectrum. He thus discovered the effect of different wavelengths of light on-photosynthesis and plotted the first action spectrum of photosynthesis. 

Test: What is Photosysnthesis (June 15) - Question 6

Who, after conducting experiments on purple and green sulfur bacteria, inferred that O2​ evolved during photosynthesis comes from H2​O not from CO2​?

Detailed Solution for Test: What is Photosysnthesis (June 15) - Question 6

Van Niel (1897-1885), on the basic of his studies with puple and green sulphur bacteria, demonstrated that phoosynthesis is a light dependent reaction in which hydrogen from a oxidisable compound reduces CO2 to form sugar.

In green sulphur bacteria, when H2S instead of H2O was used as hydrogen donor, no O2 was evolved.

6CO2+12H2S→C6H12O6+6H2O+125

From the above observation and conclusions, van Niel proposed that oxygenic photosyntheis of all organisms is actually an oxidation-reduction reaction involving action of hydrogen of water over carbon dioxide to form organic ompounds. He also propounded that oxygen is evolved from water.

Test: What is Photosysnthesis (June 15) - Question 7

Which of the below statements is/are not correct regarding chlorophyll a molecule?

(i) Molecule formula of chl a is C55​H72​O5​N4​Mg
(ii) It is the primary photosynthetic pigment.
(iii) In the pure state, it is red in colour and thus it absorbs more blue wavelength of light than the red wavelength. 
(iv) It is a soluble in water as well as petroleum ether.

Detailed Solution for Test: What is Photosysnthesis (June 15) - Question 7

Chlorophyll a is the primary photosynthetic pigment, which is bluish green in the pure state. It has an empirical formula C55​H72​O5​N4​ Mgand molecular weight of 893. It absorbs more red wavelength of light than violet blue . It is soluble in a number of organic solvents such as petroleum ether. 

Test: What is Photosysnthesis (June 15) - Question 8

Given graph represents the absorption spectra of three photosynthetic pigments, chl a chl b and β-carotene. 


Select the correct statement regarding this.

Detailed Solution for Test: What is Photosysnthesis (June 15) - Question 8

The graphical curve showing the amount of energy of different wavelengths of light absorbed by a pgment is called absorption spectrum,. It is studies with the help of spectrophotometer. The absorption spectra of chorophylls a and b show that they absorb maximum light in the blue-violet and red wavelengths. The pgments are often known after the wvelength which is absorbed to the maximum e.g., chl a673 Chl a683(P680), Chl a703(P700).

Test: What is Photosysnthesis (June 15) - Question 9

If green plant cells are incubated with O18- labeled water, which of the following will become radioactive when the cells are exposed to light.

Detailed Solution for Test: What is Photosysnthesis (June 15) - Question 9

Test: What is Photosysnthesis (June 15) - Question 10

Yellowish colour of autumn foliage is due to the presence of a type of xanthophyll pigment called as 

Detailed Solution for Test: What is Photosysnthesis (June 15) - Question 10

Xanthophylls (=Carotenois) are oxygen containing derivatives of carotenes, e.g., C40H56O (cryptoxanthin), C40H56O2 (lutein, zeaxanthin). Yellowish colour of autumnal follage is due to lutein. The characteristic xanthophyll of brown algae is fucoxathin (C40H56O6)

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