Energy Engineering Questions and Answers – Photosynthesis

This set of Energy Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Photosynthesis”.

1. The process by which plants, some bacteria and some protistans use the energy from sunlight to produce sugar?
a) Taxonomy
b) Metabolism
c) Photosynthesis
d) Osmosis
View Answer

Answer: c
Explanation: Photosynthesis is the process, by which plants, some bacteria and some protistans use the energy from sunlight to produce sugar, which cellular respiration converts into ATP, the fuel used by all living things.

2. What is used in conversion of sunlight energy into usable chemical energy in plants?
a) Anthocyanin
b) Cythochrome
c) Chlorophyll
d) Chitin
View Answer

Answer: c
Explanation: The conversion of usable sunlight energy into usable chemical energy is associated with the actions of the green pigment chlorophyll. Most of the time, photosynthetic process use water and releases the oxygen that we absolutely must have to stay alive.

3. Complete the following reaction.
H2O + CO2 → ________
a) 6H2O + 6CO2 → C6H12O6 + 6O2
b) 6H2O + 3CO2 → C6H6O6 + 4O2
c) 6H2O + 6CO2 → C6H12O12 + 12O2
d) 6H2O + 4CO2 → C+ HO3
View Answer

Answer: a
Explanation: 6H2O + 6CO2 → C6H12O6 + 6O2 is the proper form of equation.
Six molecules of water + six molecules of carbon dioxide &raar; one molecule of sugar + six molecules of oxygen.

4. Photosynthesis is carried in how many stages?
a) 1
b) 2
c) 3
d) 4
View Answer

Answer: b
Explanation: Photosynthesis is a two stage process. The first process is light dependent process which requires the direct energy of light to make energy carrier molecules that are used in the second process. And the second stage is termed as Dark reaction.

5. Photosynthetic organisms which convert light energy into the chemical energy they need to develop grow, and reproduce are called as?
a) Rubisco
b) Pigment
c) Autotrophs
d) Glucose
View Answer

Answer: c
Explanation: An autotroph or producer, is an organism that produces complex organic compounds (such as carbohydrates, fats, and proteins) from simple substances present in its surroundings, generally using energy from light or inorganic chemical reactions.

6. What is the full form of ATP?
a) Adenosine Tetra-phosphate
b) Adenosine tri-phosphate
c) Adenosine Terra-phosphate
d) Ambient temperature and pressure
View Answer

Answer: b
Explanation: Adenosine tri-phosphate (ATP) is a complex organic chemical that participates in many processes. Found in all forms of life, ATP is often referred to as the “molecular unit of currency” of intracellular energy transfer.

7. What does NADPH?
a) Nicotinamide adenosine deca-nucleotide phosphate
b) Nicotinamide adenine dinucleotide phosphate
c) Nicotinamide adenine deca-nucleotide phosphate
d) Nicotinamide adenosine dinucleo phosphor
View Answer

Answer: b
Explanation: In photosynthetic organisms, NADPH is produced by ferredoxin-NADP+ reeducates in the last step of the electron chain of the light reactions of photosynthesis. It is used as reducing power for the biosynthetic reactions in the Calvin cycle to assimilate carbon dioxide.

8. Which cycle is preferred for production of carbohydrates?
a) Nutrient cycle
b) Bio geo chemical cycle
c) Calvin – Benson Cycle
d) Sonnet cycle
View Answer

Answer: c
Explanation: The Calvin cycle (also known as the Calvin–Benson cycle) is the set of chemical reactions that take place in chloroplasts during photosynthesis. The cycle is light-independent because it takes place after the energy has been captured from sunlight. This cycle is used for the production of carbohydrate.

9. Which is the region within thylakoid where water is split into oxygen?
a) Foramen
b) Serosa
c) Lumen
d) Mucosa
View Answer

Answer: c
Explanation: The lumen is the region within the thylakoid membrane where water is split to obtain oxygen. The oxygen diffuses out of the cell, while the protons remain inside to build positive electrical charge inside the thylakoid.

10. Choose the general formula of carbohydrates?
a) [C2H2O2]n
b) [CHO]n
c) [CH2O]n
d) [C2O2]n
View Answer

Answer: c
Explanation: [CH2O]n is the correct form for representing carbohydrates. Green plants make food in the form of carbohydrates by combining carbon dioxide and water using energy from sunlight. The simplest useful form of carbohydrate produced by photosynthesis is glucose sugar. Glucose may be used as an energy source.

11. Energy plantation does not have any impact on Bio-energy.
a) True
b) False
View Answer

Answer: b
Explanation: Energy plantation means growing select species of trees and shrubs which are harvestable in a comparably shorter time and are specifically meant for fuel. The fuel wood may be used either directly in wood burning stoves and boilers or processed into methanol, ethanol and producer gas.

12.”ATP and NADPH are used to fix CO2 into carbohydrates” this process is termed as ________
a) Carbon fixation
b) Reduction
c) Carbon dating
d) Oxidation
View Answer

Answer: a
Explanation: Carbon fixation or Carbon assimilation is the conversion process of inorganic carbon (carbon dioxide) to organic compounds by living organisms. The most prominent example is photosynthesis, although chemosynthesis is another form of carbon fixation that can take place in the absence of sunlight.

13. The organelle in a plant cell where photosynthesis occurs is called _________
a) Rubisco
b) Chloroplast
c) Thylakoid
d) Pigment
View Answer

Answer: b
Explanation: The main role of chloroplasts is to conduct photosynthesis, where the photosynthetic pigment chlorophyll captures the energy from sunlight and converts it and stores it in the energy-storage molecules ATP and NADPH while freeing oxygen from water.

14. A colored molecule is called ________
a) Epoxy
b) Pigment
c) Gouache
d) Plaster
View Answer

Answer: b
Explanation: Chlorophyll-‘a’ is the primary pigment for photosynthesis in plants, but the range of light absorption is extended by chlorophyll-‘b’, beta-carotene and other accessory pigments. These are present inside a chloroplast.

15. C6H12O6 is a _________
a) Osmophile
b) Trapiche
c) Sugar
d) Butanol fuel
View Answer

Answer: c
Explanation: Glucose is a simple sugar with the molecular formula C6H12O6, which means that it is a molecule that is made of six carbon atoms, twelve hydrogen atoms, and six oxygen atoms. Plants form sugar (glucose) on photosynthesis.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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