Biology - Questions and Answers, General Study (GK)

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641.

Which one of the following wavelengths of light is most effective in photosynthesis ?

(a)Green

(b)Black

(c)Blue

(d)Red

Comment

Answer is: C

642.

A solution of chlorophyll pigments looks red in reflected light because of

(a)Refraction

(b)Reflection

(c)Fluorescence

(d)Diffraction

Comment

Answer is: C

643.

The carbon of organic compounds in plants comes from

(a)Carbonates absorbed from the soil

(b)Atmospheric carbon dioxide

(c)Organic compounds absorbed from the soil

(d)All of these

Comment

Answer is: B

644.

Which one of the following is a product of the dark reactions of photosynthesis?

(a)ATP

(b)NADH2

(c)NADPH2

(d)Sugar

Comment

Answer is: D

645.

Which of the following scientists was awarded Nobel Prize for his work on photosynthesis?

(a)Robert Hooke

(b)FF Blackman

(c)Melvin Calvin

(d)CB Van Niel

Comment

Answer is: C

646.

Green plants evolve oxygen during the day rather than carbon dioxide. This means that

(a)The rate of photosynthesis is much higher than the rate of respiration

(b)Green plants respire during the day also but the rate of respiration is very low

(c)Green plants respire only at night

(d)Green plants do not respire

Comment

Answer is: A

647.

"I flatter myself having discovered the method that nature employs to purify air. It is vegetation. "Who is credited with this statement and discovery ?

(a)Louis Pasteur

(b)Antoine Laurent Lavoisier

(c)Joseph Priestley

(d)William Harvey

Comment

Answer is: C

648.

When fishes are kept in an aquarium containing water but no aquatic plants, they frequently come to the surface and float in a semivertical position for want of ?

(a)Dissolved oxygen

(b)Oxygen

(c)Air

(d)Fresh supply of oxygen

Comment

Answer is: A

649.

Some animals have a unique method of bringing oxygen directly to the cells. These are

(a)Scorpions

(b)Insects

(c)Flatworms

(d)Spiders

Comment

Answer is: B

650.

The digestive and breathing passages cross in the
A).

(a)Larynx

(b)Oesophagus

(c)Pharynx

(d)Trachea

Comment

Answer is: C

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Biology - Questions and AnswersPage 65

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