Biology Questions and Answers
loss of water by transpiration is thus
reduced. Some plants ofalso have stomata within cavities. dry climates
- Is transpiration the only
way through which leaves lose
water?
Plants do not only lose as by transpiration. The leaves also losewater as vapor, (^)
liquid water by a phenomenon known as
gutation. Gutation takes pstructures called hydathodes similarlace through to (^)
stomata.transpiration Gutationis difficult due to high air mainly occurs when
humidity or when the plant is placed in
a watery soil.
- When air humidity is high
does the plant transpiration
increase or lower?
When air humidity is high transpiration
diminishes. Since simple diffusion process it depends upontranspiration is a (^)
the concentration gradient of water
between the plant aIf the atmosphere has too much waternd the environment.
vapor the gradient becomes lower or
even reversed.
- How do the water
absorption volume and the
water transpiration volume
comparatively vary in plants
in a day? What is the final
comparative balance of these
processes?
During the day the transpired volume ofwater is higher than thabsorbed by the roots. At night thee volume (^)
situation reverses and the roots absorb
more water than the transpired volume.
It is observed that the transpired and
the absorbed volumes pin a day. ractically equal
- How do plants solve the
problem of transporting
substances throughout their
tissues?
In bryophytes thdone by diffusion. In tracheophytese substance transport is
(pteridophytes, gymnosperms and
angiospconductive verms) thessels,ere are specialized the xylem that
carries water and mineral salts and the
phloem that con(sugar). ducts organic material - Is transportation of gases
in tracheophytes made
through the vascular tissues?
Carbon dioxitransported through the xylem ode and oxygen are notr
phloem. These gases rexit the plant by diffusion each ththroughe cells an d
intercellular spaces or between
neighboring cells.
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