1. Which of the following would help a plant growing in saline soil to maintain

Question

1. Which of the following would help a plant growing in saline soil to maintain water pressure in its xylem vessels?

a. Opening stomata to increase transpiration

b. Actively transporting ions into root tissues to increase osmolarity

c. Actively transporting ions from xylem into leaf cells

d. a and b

e. all of the above

2. The advantage of countercurrent circulation in the circulatory system is that:

a. The number of blood vessels is minimized

b. The length of blood vessels required for circulation is minimized

c. Heat can be conserved through conductive transfer from arteries to veins

d. Animals can cool the body through radiative transfer from veins to arteries

e. both c and d

3. If all prey types have the same energy reward, a consumer should rank them from most to least profitable by:

a. Ranking them from highest search time to lowest.

b. Ranking them from lowest search time to highest.

c. Ranking them from highest handling time to lowest

d. Ranking them from lowest handling time to highest

e. Their profitability will be identical so the ranking will not matter

Explanation / Answer

1. Answer: E) all of the above

There are various mechanisms for salt tolerance, one of which is compartmentalisation of ions where ions are transported into root tissues for increasing osmolarity. Also, an increase in transpiration pull keeps the water pressure in xylem maintained.

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