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 Biology Questions

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Q:

Select the correct statement about photosynthesis by primary producers.

A) Photosynthetic protists and prokaryotes Carry out the majority of the photosynthesis in aquatic communities. B) Land plants carry out over 80% of the world's photosynthesis.
C) Cyanobacteria carry out more of the world's photosynthesis than protist do. D) All of the above
 
Answer & Explanation Answer: A) Photosynthetic protists and prokaryotes Carry out the majority of the photosynthesis in aquatic communities.

Explanation:
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Q:

Bone strength in later life depends on

A) the formation of dense bones during youth B) the increased calcium absorption in the elderly
C) the increased production of estrogen after menopause D) reducing physical activity to protect bones
 
Answer & Explanation Answer: A) the formation of dense bones during youth

Explanation:
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Q:

Which formula represents an amino acid?

A) R-CH3(NH2)-COOH B) R-CH(NH2)-COOH
C) R-CH2(NH2)-COOH D) R-CH3(NH2)-COH
 
Answer & Explanation Answer: B) R-CH(NH2)-COOH

Explanation:

Amino acids are the building blocks of proteins. There are about 21 essential amino acids in the human body like histidine, leucine, lysine... The general formula for amino acid is R-CH(NH2)-COOH.

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Q:

Air in the pleural cavity is called a pneumothorax.

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

Air or gas can build up in the pleural space and when this happens, it's called a pneumothorax.


Hence the given statement is TRUE.

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Q:

Biological control is to check growth of 

A) plants B) animals
C) weeds D) one pest by another
 
Answer & Explanation Answer: D) one pest by another

Explanation:

Biological Control: This method is very effective. One pest is destroyed by another organism. For example the aphids are killed by lady beetle. The prickly pear is eradicted by cochineal insect. Here the advantage is, one does not use harmful chemicals which may get into the host plants.

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Q:

What three statements make up the cell theory?

A) All living things are made up of cells. B) New cells come frome exisiting cells.
C) Cells are the basic unit of structure/function in living things. D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

The three statements make up the cell theory are::

 

1. All living things are made up of cells.

2. Cells are the basic unit of structure/function in living things.

3. New cells come frome exisiting cells.

 

These cells can vary widely, but all living things are composed of cells.

 

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Q:

Which of the following are involved directly in pulmonary circulation?

A) left ventricle, aorta, and inferior vena cava B) right atrium, aorta, and left ventricle
C) superior vena cava, right atrium, and left ventricle D) right ventricle, pulmonary artery, and left atrium
 
Answer & Explanation Answer: D) right ventricle, pulmonary artery, and left atrium

Explanation:

Right ventricle (which pumps blood to the lungs), pulmonary artery (which carries blood to the lungs), and left atrium (which receives blood from the lungs) are involved directly in pulmonary circulation.

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Q:

In ovaries, the final products of meiosis are

A) haploid gametes B) diploid gametes
C) Both A & B D) None of the above
 
Answer & Explanation Answer: A) haploid gametes

Explanation:
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