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Q:

Animals in which the cells are arranged in three embryonic layers are called ________.

A) Diploblastic B) Ectoderm
C) Tripoblastic D) Endoderm
 
Answer & Explanation Answer: C) Tripoblastic

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Q:

Which of the following is NOT a form of Monosaccharide Sugar?

A) Galactose B) Glucose
C) Fructose D) Maltose
 
Answer & Explanation Answer: D) Maltose

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Q:

The somatosensory receptors in human beings detect ______.

A) taste B) smell
C) touch D) hear
 
Answer & Explanation Answer: C) touch

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Q:

Which of the following is responsible for giving colour to human skin?

A) Luciferin B) Haemoglobin
C) Flavonoids D) Melanin
 
Answer & Explanation Answer: D) Melanin

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Q:

Bryophytes are also called ____________ of the plant kingdom.

A) Mammals B) Amphibians
C) Reptiles D) Insecta
 
Answer & Explanation Answer: B) Amphibians

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Q:

Most viruses that infect plants possess

A) single-stranded DNA B) single-stranded RNA
C) double-stranded DNA and RNA D) double-stranded RNA only
 
Answer & Explanation Answer: B) single-stranded RNA

Explanation:

Generally viruses that infect plants have single stranded RNA. Viruses infecting animals have double stranded RNA or DNA. Viruses which infect bacteria have double stranded DNA.

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Q:

A genetically engineered form of brinjal known as the BT-­brinjal has been developed. The objective of this is

A) to make it pest resistant B) to improve its taste and nutritive value
C) to make it drought resistant D) to make its shelf-­life longer
 
Answer & Explanation Answer: A) to make it pest resistant

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Q:

Which one of the following statements regarding haemoglobin is correct?

A) Haemoglobin present in RBC can carry only oxygen but not carbon dioxide B) Haemoglobin of RBC can carry both oxygen and carbon dioxide
C) Haemoglobin of RBC can carry only carbon dioxide D) Haemoglobin is only used for blood clotting and not for carrying gases.
 
Answer & Explanation Answer: B) Haemoglobin of RBC can carry both oxygen and carbon dioxide

Explanation:

During respiration, about 97% of oxygen is transported by Red Blood Cells in blood and the remaining 3% gets dissolved in the plasma.Around 20-25% of carbon dioxide is carried by haemoglobin as carbamino-haemoglobin.

Oxygen enters the blood from the lungs and carbon dioxide is expelled out of the blood into the lungs. The blood serves to transport both gases. Oxygen is carried to the cells. Carbon dioxide is carried away from the cells.

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