TOEFL Reading Practice 1

1. How many theories does the author mention?

• One

• Two

• Three

• Four

The passage answers which of the

following questions?

• What is the effect of atmospheric pressure

  on foliage?

• When do dead cells harm plant growth?

• How does water get to the tops of trees?

• Why is root pressure weak?

The word "demonstrated" in line 6 is

closest in meaning to

• ignored

• showed

• disguised

• distinguished

What do the experiments mentioned in lines

5-7 prove?

• Plant stems die when deprived of water

• Cells in plant stems do not pump water

• Plants cannot move water to high

  altitudes

• Plant cells regulate pressure within stems

How do botanists know that root pressure is

not the only force that moves water in plants?

• Some very tall trees have weak root

  pressure.

• Root pressures decrease in winter.

• Plants can live after their roots die.

• Water in a plant's roots is not connected

  to water in its stem.

Which of the following statements does the

passage support?

• Water is pushed to the tops of trees.

• Botanists have proven that living cells act

  as pumps.

• Atmospheric pressure draws water to the

  tops of tall trees.

• Botanists have changed their theories of

  how water moves in plants.

The word "it" in line 12 refers to

• top

• tree

• water

• cohesion-tension theory

The word "there" in line 14 refers to

• treetops

• roots

• water columns

• tubes

What causes the tension that draws water up

a plant?

• Humidity

• Plant growth

• Root pressure

• Evaporation

The word "extend" in line 18 is closest in

meaning to

• stretch

• branch

• increase

• rotate