Tag: metabolism, cell respiration, and photosynthesis

Quizzes (10) Questions (154)

Questions Related to metabolism, cell respiration, and photosynthesis

Multiple choice botany metabolism, cell respiration, and photosynthesis light dependent or hill reaction phases of photosynthesis emerson's experiments & hill's reaction

In photosynthesis light energy is utilized in 

  1. Converting ATP into ADP
  2. Changing CO$ _{2}$ into carbohydrate

  3. Converting ADP into ATP

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Photosynthesis is a process in which phosphorylation occurs. Phosphorylation is a process in which phosphate group is added, and in the case of photosynthesis it happens in the presence of light, thus called as 'photophosphorylation'. ADP is converted to ATP, the energy currency as the main product of this process. In photosynthesis, cyclic and non-cyclic photophosphorylation takes place in the light phase and generate ATP and NADPH.

So, the correct answer is option C.

Multiple choice botany metabolism, cell respiration, and photosynthesis light dependent or hill reaction phases of photosynthesis emerson's experiments & hill's reaction

The phenomenon of re-irradiation of absorbed light is called

  1. Photoluminescence

  2. Chemiluminescence

  3. Phosphorescence

  4. Fluorescence
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Photoluminescence is the phenomenon of light emission after absorption of photons in the form of electromagnetic radiation. Chemiluminescence is the phenomenon of emission of light from a chemical reaction. Phosphorescence is a type of photoluminescence which is related to fluorescence. It does not re-irradiate the absorbed light immediately like fluorescence. Fluorescence is the phenomenon of re-irradiation of light absorbed light or electromagnetic radiation.

Thus, the correct answer is option D.

Multiple choice botany metabolism, cell respiration, and photosynthesis light dependent or hill reaction phases of photosynthesis emerson's experiments & hill's reaction

Raw materials required for light reactions are

  1. ADP and $H _2O$
  2. ADP, $H _2O$ and NADP
  3. ADP and $NADPH _2$

  4. ATP and NADP.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A) ADP and ${ H } _{ 2 }O$ are required in addition to NADP.

B) ADP, ${ H } _{ 2 }O$ and NADP are the raw materials used to produce ATP and NADPH.
C) NADPH is a product of the light reaction.
D) ATP is a product of the light reaction.
So the correct answer is 'ADP, ${ H } _{ 2 }O$ and NADP'.

Multiple choice botany metabolism, cell respiration, and photosynthesis light dependent or hill reaction phases of photosynthesis emerson's experiments & hill's reaction

PS I and PS II occur over

  1. Grana of chloroplast

  2. Matrix of mitochondria

  3. Stroma of chloroplast

  4. Inner membrane of mitochondrion
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The process that converts light energy into chemical energy takes place in a multi-protein complex called a photosystem. Two types of photosystems are embedded in the thylakoid membrane:- photosystem II ( PSII) and photosystem I (PSI). Each photosystem plays a key role in capturing the energy from sunlight by exciting electrons. These energized electrons are transported by “energy carrier” molecules, which power the light-independent reactions.


So, the correct option is 'Option A'.

Multiple choice botany metabolism, cell respiration, and photosynthesis light dependent or hill reaction phases of photosynthesis emerson's experiments & hill's reaction

How many PGAL molecules would regenerate 15 RuBP

  1. 30

  2. 25

  3. 15

  4. 20.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the Calvin cycle, 6 molecules of PGAL (glyceraldehyde-3-phosphate) are produced per turn equivalent to 3 carbon dioxide molecules fixed. To regenerate 15 molecules of RuBP (which contain 5 carbons each, totaling 75 carbons), 25 PGAL molecules are required.

Multiple choice botany metabolism, cell respiration, and photosynthesis light dependent or hill reaction phases of photosynthesis emerson's experiments & hill's reaction

Excitation of chlorophyll by light is

  1. Exergonic reaction

  2. Anabolic reaction

  3. Photochemical reaction

  4. Photooxidation reaction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The first and foremost step of photosynthesis is the excitation of chlorophyll molecule which occurs with the absorption of light. This reaction is photochemical reaction since involves light and results in chemical change by transfer of electrons. The pigments present in the photosystems absorb photon of light. The photons excite electrons in the chlorophyll which then move through the electron transport chain and results in the production of carbohydrates and energy packets NADPH, ATP with the release of oxygen.

Multiple choice botany metabolism, cell respiration, and photosynthesis light dependent or hill reaction phases of photosynthesis emerson's experiments & hill's reaction

Light reaction of photosynthesis is also called

  1. Calvin cycle

  2. Hill reaction

  3. TCA cycle

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Hill reaction implies that the light-dependent reaction of photosynthesis is a result of a series of redox reactions and a suitable terminal electron acceptor is required for that reaction to occur. Hence, solar energy is converted to chemical energy by the reduction of NADP to NADPH.


So, the correct option is 'Hill reaction'.

Multiple choice botany metabolism, cell respiration, and photosynthesis light dependent or hill reaction phases of photosynthesis emerson's experiments & hill's reaction

First reaction in photosynthesis is

  1. Photolysis of water

  2. Excitation of chlorophyll molecules

  3. Formation of ATP
  4. Fixation of CO$ _2$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During the first stage of photosynthesis, called the light-dependent reaction, sunlight excites the electrons in the chlorophyll pigment. The organism uses this energy to create the energy carrier molecules ATP and NADPH, which are crucial for carbon fixing during the second stage.


So, the correct option is 'Excitation of chlorophyll molecules'.

Multiple choice botany metabolism, cell respiration, and photosynthesis light dependent or hill reaction phases of photosynthesis emerson's experiments & hill's reaction

How much oxygen is formed from 264 g of $CO _2$ and 216 g of $H _2O$?

  1. 96 g

  2. 216 g

  3. 264 g

  4. 192 g.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Moles = Weight in gms/molecular weight
So, moles of CO$ _2$ =264/44 = 6 moles.
  • In same way moles of H2O = 216/18 = 12 moles.
In a reaction of photosynthesis, 6 moles of CO$ _2$ and 6 moles of water lead to the production of 6 moles of oxygen. Here, CO$ _2$ is a limiting reactant. So only 6 moles of oxygen will be formed.So, 6 moles of O$ _2$ = weight in gms/32 (molecular weight of O$ _2$). Weight in gms = 6 x 32 = 192 gms.

Multiple choice botany metabolism, cell respiration, and photosynthesis light dependent or hill reaction phases of photosynthesis emerson's experiments & hill's reaction

Fluoroscence differs from phosphorescence in being

  1. Delayed emission

  2. Instant emission

  3. Bioluminescence

  4. Chemiluminescence
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Fluorescence is the phenomenon of absorption of energy by molecule or atom and instant emission of a photon of light or electromagnetic radiation after being excited to a higher quantum state. In this, time interval between absorption and emission of energy is very short. Unlike fluorescence, phosphorescence does not show instant emission of radiation. In this, excitation of electrons is accompanied with the change of a spin state. In this, the time interval between absorption and emission of energy is comparatively longer.
Thus, the correct answer is option B.