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 Biology Questions

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Q:

Select the correct statement about oxygen transport in blood

A) A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal B) During normal activity, a molecule of hemoglobin returning to the lungs carries one molecule of O2
C) During conditions of acidosis, hemoglobin is able to carry oxygen more efficiently D) Increased BPG levels in the red blood cells enhance oxygen-carrying capacity
 
Answer & Explanation Answer: B) During normal activity, a molecule of hemoglobin returning to the lungs carries one molecule of O2

Explanation:
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Q:

When is genetic drift a major factor in evolution?

A) When there is male competition B) When there is artificial selection
C) When there is no selective pressure D) When there is disruptiveselection
 
Answer & Explanation Answer: C) When there is no selective pressure

Explanation:

Genetic drift or allelic drift is the change in the relative frequency in which a gene variant (allele) occurs in a population due to random sampling and chance.

 

When is genetic drift a major factor in evolution is

* When there is low gene flow.

* When there is no selective pressure.

* When there is a bottleneck.

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Q:

In most green plants, chloroplasts are

 

A) concentrated in a zone of leaf tissue called the mesophyll B) concentrated in a portion of the leaf called the stroma
C) found throughout the leaf tissue D) concentrated in the stomata
 
Answer & Explanation Answer: A) concentrated in a zone of leaf tissue called the mesophyll

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Q:

Prokaryotic cells lack

A) Membrane bound by organelles B) Nucleolus
C) Nuclear membrane D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

Prokaryotic cells lack a nucleus and do not have an extensive system of interior membranes. They are encased in a cell wall and many contain external structures such as a capsule, flagellum, or pili. Prokaryotes – have a relatively uniform interior that is not subdivided by internal membranes.

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Q:

Transmission of stimuli from one part of body to other part takes place through __________

A) Muscular tissue B) Epithelium tissue
C) Connective tissue D) Nervous tissue
 
Answer & Explanation Answer: D) Nervous tissue

Explanation:
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Q:

Which of the following harmone is called the emergency harmone ?

A) Insulin B) Adrenaline
C) Estrogen D) Oxytocin
 
Answer & Explanation Answer: B) Adrenaline

Explanation:
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Q:

When more than 20% of the body weight is due to fat, the person is suffering from

A) Marasmus B) Kwashiorkor
C) Scurvy D) Obesity
 
Answer & Explanation Answer: D) Obesity

Explanation:
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Q:

The Mode of nutrition in which particulate food is devoured is 

A) holozoic B) holophytic
C) saprophytic D) Parasitic
 
Answer & Explanation Answer: A) holozoic

Explanation:

The feeding mechanism is of several types. If it is entirely plant-like (photosynthesis),it is called holophytic. It is entirely (holo) animal-like (zoic), that is devouring already existing food, it is called holozoic.

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