Tag: photosynthesis in higher plants

Questions Related to photosynthesis in higher plants

Electron Transport System (ETS) is located in mitochondrial
botany photosynthesis electron transport system modern concept of photosynthesis photosynthesis in higher plants

  1. Outer membrane

  2. Inter membrane space

  3. Inner membrane

  4. Matrix

Show answer
Correct Option: C
Explanation:

An electron transport system (ETS) or electron transport chain (ETC) is a series of coenzymes and cytochromes that take part in the passage of electrons from one carrier to another and to its ultimate acceptor. The various components of ETS are arranged in five kinds of complexes, arranged in a definite sequence in the inner mitochondrial membrane.

So the correct option is C.

Cyclic photophosphorylation takes place in the thylakoid which lacks:

botany photosynthesis electron transport system modern concept of photosynthesis photosynthesis in higher plants

  1. Electron transport system

  2. Enzyme FNR(ferredoxin NADP reductase )

  3. Lumen

  4. Photosystem with absorption peak $700nm$

Show answer
Correct Option: A
Explanation:

Cyclic Photophosphorylation is the process, in which systems (like prokaryotes), just accomplishes the ADP to ATP for immediate energy for the cells. This type of photophosphorylation usually occurs in the thylakoid membrane. So the correct option is ' Electron transport system'.

Consider the following events in the photochemical conversion of light energy into chemical energy by chlorophyll during photosynthesis.
a. Charge separation
b. Absorption of a quantum of energy
c. Ejection of electron
d. Transfer of light energy
The correct sequence of these events is?

botany photosynthesis electron transport system modern concept of photosynthesis photosynthesis in higher plants

  1. $4, 2, 1, 3$

  2. $4, 2, 3, 1$

  3. $2, 4, 1, 3$

  4. $2, 4, 3, 1$

Show answer
Correct Option: A
Which range of wavelength (in nm) is called photosynthetically active radiation (PAR)? 
botany photosynthesis electron transport system modern concept of photosynthesis photosynthesis in higher plants

  1. 100-390

  2. 390-430

  3. 400-700

  4. 760-10,000

Show answer
Correct Option: C
Explanation:

Sunlight or solar radiations reaching the earth have wavelength between 300 nm (in the ultra volt rang) to 2600 nm (in the infa-red range). Part of the spectrum used in photosynthesis has a wavelength between 400-700 nm, it is called as photo synthetically active radiation (PAR). 

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

(i) Molecule formula of chl a is $C _{55}H _{72}O _5N _4Mg$
(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.

biology photosynthesis in higher plants types of chlorophyll pigments photosynthetic pigments

  1. (i) and (iii)

  2. (iii) and (iv)

  3. (ii) only

  4. (iv) only

Show answer
Correct Option: B
Explanation:

Chlorophyll a is the primary photosynthetic pigment, which is bluish green in the pure state. It has an empirical formula $C _{55}H _{72}O _5N _4Mg$and 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. 

So, the correct answer is ' In the pure state, it is red in colour and thus it absorbs more blue wavelength of light than the red wavelength and It is a soluble in water as well as petroleum ether'.

The law of limiting factor for photosynthesis was enunciated by 

biology plant nutrition limiting factors factors affecting photosynthesis photosynthesis in higher plants

  1. Blackman

  2. Hill

  3. Ruben

  4. Kalmen

Show answer
Correct Option: A
Explanation:

The main factors affecting rate of photosynthesis are light intensity, carbon dioxide concentration and temperature. In any given situation any one of these may become a limiting factor, in other words, the factors that directly affects the rate at which photosynthesis can take place masking the effects of the other factors. A limiting factor in a system is an input or variable such that a small change in it from the present value would cause a non-negligible change in an output or other measure of the system.  

According to Sachs, photosynthesis takes place at the

biology plant nutrition limiting factors factors affecting photosynthesis photosynthesis in higher plants

  1. Minimum value.

  2. Maximum value.

  3. Optimum value.

  4. All of the above.

Show answer
Correct Option: C
Explanation:

Blackman's Law of limiting factors are the various factors which affect the rate of photosynthesis. It is considered that when the other factors are constant, the factor which is least or minimum has the direct effect on the rate of photosynthesis. Sachs developed three cardinal points for each factor which affects the rate of photosynthesis. These cardinals have minimum, optimum and maximum values. The process of photosynthesis starts at the minimum and takes place at the optimum value. the rate of photosynthesis is much smaller at the maximum value and stops above this point.

Thus, the correct answer is option C. 

The Blackman's law of limiting factor is an elaboration of

biology plant nutrition limiting factors factors affecting photosynthesis photosynthesis in higher plants

  1. Liebig's law of minimum.

  2. Hatch and Slack mechanism.

  3. Sach's cardinal points.

  4. None of the above.

Show answer
Correct Option: A
Explanation:

Blackman's Law of limiting factors was the elaborated form of the law of minimum given by Liebig. These are the various factors which affect the rate of photosynthesis. It is considered that when the other factors are constant, the factor which is least or minimum has the direct effect on the rate of photosynthesis. 

Thus, the correct answer is option A. 

A plant is exposed to an optimum amount of light intensity, with a limited supply of CO$ _2$. As the carbon dioxide, concentration increases the rate of photosynthesis increases. Which of the following act as limiting factor in above-given case?

biology plant nutrition limiting factors factors affecting photosynthesis photosynthesis in higher plants

  1. Carbon dioxide

  2. Light

  3. Temperature

  4. Both A and B

Show answer
Correct Option: A
Explanation:
Blackman's law of limiting factors are the various factors which affect the rate of photosynthesis. It is considered that when the other factors are constant, the factor which is least or minimum has the direct effect on the rate of photosynthesis. When the light intensity is maintained at the optimum level, the other factor which is CO$ _2$ supply is reduced. This causes the rate of reaction to completely depend on CO$ _2$. When the carbon dioxide concentration increases, the rate of reaction increases. This explains that the limiting factor is carbon dioxide. 
Thus, the correct answer is option A. 

A plant is exposed to an optimum amount of carbon dioxide, with a limited light intensity. As the intensity of light increases, the rate of photosynthesis increases. Which of the following act as limiting factor in above-given case?

biology plant nutrition limiting factors factors affecting photosynthesis photosynthesis in higher plants

  1. Light

  2. Carbon dioxide

  3. Temperature

  4. All of the above

Show answer
Correct Option: A
Explanation:
Blackman's law is applicable to photosynthesis. It states that a process  is controlled by many factors but the rate of photosynthesis will depend on the factor which is present in limited quantity. If all factors are present but light intensity is low then light will become the limiting factor and rate of photosynthesis will depend only on light, the limiting factor. The level of carbon dioxide is maintained constant and so light is the limiting factor. 
Thus, the correct answer is option A.