1.) Which of the following EXPLAINS why transcription aids water move upwards? a. Water moves by...

1.) Which of the following EXPLAINS why transcription aids water move upwards?

a. Water moves by osmosis from hypotonic areas, with low solute concentration into hypertonic areas.

b. Water molecules stick to each other, each molecule that evaporates pulls the next one.

c. Water molecules have adhesion to the walls of racheids and xylem vessels allowing them to form tall columns of water.

d. Plant cell membranes have channels called aquaporings that allow water to move through the membrane fast.

Expert Solution

Ans. Correct option- B. The force of “sticking together” of same type of molecules (here, water) is called cohesion. Transpiration-Cohesion Theory explains that loss of water molecules during transpiration from stomata creates a negative pressure at the site, which in turn is strong enough to pull the adjacent water molecules at the site (from where water molecule was lost). That is, loss of water molecules through stomata “pulls” adjacent water molecules – the process thus causes water move upward the length of plant during transpiration.

# Option A- Incorrect. A hypertonic area has higher solute concertation.

# Option C- Incorrect. The statement is true. However, it does not “explains” why/how adhesion cause an upward movement of water during transpiration.

# Option D- Incorrect. The statement is true- the plant cell membrane has aquaporin, most organisms have it, too. However, it does not “explains” why/how aquaporin is responsible for causing an upward movement of water during transpiration.

Note: Correct "Transcription" and "Transpiration" ; and "Aquaporings" as "Aquaporin"

gladiator answered 1 year ago

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