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Q:

Which of the following cells do not contain nucleus?

1. Root hair cells

2. Red blood cells

3. Platelets

4. Monocytes

Select the correct answer using the code given below.

A) 1 only B) 2 and 3 only
C) 1, 2 and 4 D) 2, 3 and 4
 
Answer & Explanation Answer: B) 2 and 3 only

Explanation:

The absence of a nucleus is an adaptation of the red blood cell for its role. It allows the red bloodcell to contain more haemoglobin and, therefore, carry more oxygen moleculesLike red cells, platelets (thrombocytes) have no nucleus.Monocytes have a small spherical nucleus and has abundant dark staining condensed chromatin.There are 5 organelles found in a root hair cell. They are the: nucleus, cytoplasm, cell membrane, cell wall and vacuole.

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Filed Under: Biology
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Q:

Which of the following statements is true?

The velocity of sound is :

 

A) less in summer than in winter B) same in winter and summer
C) independent of seasons D) more in summer than in winter
 
Answer & Explanation Answer: D) more in summer than in winter

Explanation:
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Q:

Isotopes of an element have ______.

 

A) Same physical properties B) Different chemical properties
C) Different number of neutrons D) Different atomic number
 
Answer & Explanation Answer: C) Different number of neutrons

Explanation:
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Filed Under: Chemistry
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Q:

Who coined the term ‘protoplasm’ for the fluid substance of the cell?

 

A) Robert Hooke B) Robert Brown
C) J.E Purkinje D) M. Schleiden
 
Answer & Explanation Answer: C) J.E Purkinje

Explanation:
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Q:

‘Sea Vigil-21’ is a Defence Exercise undertaken by which country?

 

A) China B) Japan
C) India D) United Kingdom
 
Answer & Explanation Answer: C) India

Explanation:
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Filed Under: General Awareness
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Q:

India was declared free from which infective eye disorder on 9 December, 2017?

 

A) Blepharitis B) Chalazia
C) Pinkeye D) Trachoma
 
Answer & Explanation Answer: D) Trachoma

Explanation:
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Q:

Sound waves can not travel through a

 

A) copper wire placed in air B) silver slab placed in air
C) glass prism placed in water D) wooden hollow pipe placed in vacuum
 
Answer & Explanation Answer: D) wooden hollow pipe placed in vacuum

Explanation:

Sound is a kind of energy created when something vibrates. When this vibration reaches an ear, it is translated into what we recognize as a sound. Sound vibration must travel through matter. Therefore, it can travel through air and water but not through vacuum.

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Q:

The filament of a light bulb is made up of

 

A) Platinum B) Tantalum
C) Tungsten D) Antimony
 
Answer & Explanation Answer: C) Tungsten

Explanation:
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