General Science Questions

Q:

Which of these is a starting point for primary succession?

A) a surface exposed by a retreating glacier B) a neglected yard
C) abandoned farmland D) an abandoned city
 
Answer & Explanation Answer: A) a surface exposed by a retreating glacier

Explanation:

Primary succession is the orderly and predictable series of events through which a stable ecosystem forms in a previously uninhabited region. Primary succession occurs in regions characterized by the absence of soil and living organisms.

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Q:

Name the scientist who proposed the cell theory

A) Schleiden and Schwann B) Lamarck
C) Treviranus D) Whittaker and Stanley
 
Answer & Explanation Answer: A) Schleiden and Schwann

Explanation:
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Q:

What is the role of NADP+ in photosynthesis?

Answer

NADP - Nicotinamide Adenine Dinucleotide Phosphate is one of the carrier molecules that transfers high-energy electrons from chlorophyll to other molecules.


NADP+ is the molecule that accepts the electrons given by water. Its reduction by the protein FNR (Ferredoxin NADP+ reductase) gives NADPH,H+.


 


NADPH,H+ can be used in the Calvin Cycle to reduce 1,3-Biphosphoglycerate (1,3-BPG) into Glyceraldehyde-3-phosphate (G3P), a monosaccharide. It becomes NADP+ again and the cycle keeps repeating as long as the chloroplast receives sufficient and appropriate light.

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Q:

What stage occurs after cytokinesis?

A) S - phase B) G1 phase
C) G2 phase D) All of the above
 
Answer & Explanation Answer: B) G1 phase

Explanation:

It is the Interphase, which occurs after cytokinesis. And in interphase we have 3 stages likely G1, G2 and S phase. After cytokinesis we get G1 phase.

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Q:

One who eats everything

A) Carnivores B) Omnivores
C) Herbivores D) Omniscient
 
Answer & Explanation Answer: B) Omnivores

Explanation:

One the person or a animal who eats everything i.e, no kind of food is refused are called as Omnivores.

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Q:

If the orbit of a planet is an ellipse then what is the point at which the Sun is located called?

A) Centre B) Circumcentre
C) Incentre D) Focus
 
Answer & Explanation Answer: D) Focus

Explanation:
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Q:

Energy travels from Sun to Earth through

A) conduction B) convection
C) radiation D) modulation
 
Answer & Explanation Answer: C) radiation

Explanation:
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Q:

The HIV virus weakens the immunity of a person because it destroys

A) mast cells B) platelets
C) erythrocytes D) lymphocytes
 
Answer & Explanation Answer: D) lymphocytes

Explanation:

The    HIV    virus    continuously    invades    and destroys  T-cells  (lymphocytes).  Eventually  the body can't replace the T-cells fast enough, and the  immune  system  deteriorates.  When  the immune  system has deteriorated to the point that it is unable to fight off diseases, a person is diagnosed with AIDS.

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