Earth science c/o plants and precipatation

Question

1.  a plant which dfoes not receive enough water would,

 

   a.  increase turgor

   b.  decrease photosyntheseis

   c.  both a and b

   d.  none of these

 

2.  capillary action in plants depend upon

 

  a.  transpiration

  b.  cellular respiration

  c.  condensation

  d.  specific heat

 

3.  Transpiraton depends directly upon

 

  a.  condensation

  b.  evaporation

  c.  turgor

  d  precipitation

 

4.  between 0 degrees and 4 degrees C

 

    a.  liquid water is more dense than ice

   b.  liquid water is less dense than ice

   c.  both liquid water and ice have the same density

 

5.  ponds freeze

 

   a.  from the bottom up

   b.  from the top down

   c.  when the temperature is above 4 degrees C

   d.  all of these

Answer 1

1) b. Decrease photosynthesis

Water stress lowers turgor pressure (cells become flaccid instead of firmer), stomata close to conserve water, CO₂ entry drops, and photosynthesis decreases.

2) a. Transpiration

Capillary rise in plants is possible because of cohesion/adhesion and surface tension. Still, the main upward pull in xylem comes from transpiration—water evaporating from leaves pulls the column upward.

3) b. Evaporation

Transpiration is the evaporation of water from leaf surfaces. More evaporation (dry, warm, windy air) → more transpiration.

4) a. Liquid water is denser than ice

Between 32°F and ~39.2°F, liquid water becomes denser as it warms toward about 39°F (its max density), while ice is less dense—that’s why ice floats.

5) b. From the top down

As a pond cools, surface water sinks until the whole pond is near ~39°F (densest). Then the surface cools below 39°F, approaching 32°F, and freezes first. Ice (less dense) stays on top and insulates the water below, so freezing proceeds downward.