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Q:

Which one of the following cell organelles mainly functions as storehouse of digestive enzymes?

A) Desmosome B) Ribosome
C) Lysosome D) Vacuoles
 
Answer & Explanation Answer: C) Lysosome

Explanation:

Lysosome is found in nearly all types of eukaryotic cells (cells with a clearly defined nucleus) and is responsible for the digestion of macromolecules, old cell parts, and microorganisms. Each lysosome is surrounded by a membrane that maintains an acidic environment within the interior via a proton pump. Lysosomes contain a wide variety of hydrolytic enzymes (acid hydrolases) that break down macromolecules such as nucleic acids, proteins, and polysaccharides. So, they are known as storehouse of digestive enzymes.

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Q:

____ is the most electropositive and ___ is the most electronegative element of the third period of modern periodic table.

 

A) Sodium, Potassium B) Magnesium, Aluminium
C) Sodium, Chlorine D) Aluminium, Chlorine
 
Answer & Explanation Answer: C) Sodium, Chlorine

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Q:

Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?

A) BBr3 B) NH3
C) CH2N2 D) CCl2F2
 
Answer & Explanation Answer: D) CCl2F2

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Q:

Name the gas used in preparation of bleaching powder

A) Oxygen B) Hydrogen
C) Nitrogen  D) Chlorine
 
Answer & Explanation Answer: D) Chlorine

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Q:

Name the reddish brown gas evolved when Lead Nitrate is heated strongly.

A) Nitric oxide B) Nitrogen di oxide
C) Di Nitrogen Oxide D) Nitrogen pentoxide
 
Answer & Explanation Answer: B) Nitrogen di oxide

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Q:

_______________ is the movement of molecules across a cell membrane from a region of their lower concentration to a region of their higher concentration.

A) Diffusion B) Osmosis
C) Active Transport D) Passive Transport
 
Answer & Explanation Answer: C) Active Transport

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Q:

Which method will be employed to test the hardness of water?

A) Boiling B) Distillation
C) Formation of lather with soap D) None of these
 
Answer & Explanation Answer: C) Formation of lather with soap

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Q:

Which of the following represents an ion?

A) a particle having 9 protons, 9 neutrons, and 10 electrons B) a particle having 19 protons, 21 neutrons, and 19 electrons
C) a particle having 14 protons, 14 neutrons, and 14 electrons D) a particle having 1 proton, 3 neutrons, and 1 electron
 
Answer & Explanation Answer: A) a particle having 9 protons, 9 neutrons, and 10 electrons

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