- The process of guttation takes place when
(a) the root pressure is high and the rate of transpiration
is low
(b) the root pressure is low and the rate of transpiration
is high
(c) the root pressure equals the rate of transpiration
(d) the root pressure as well as rate of transpiration are
high. - Select the mismatched pair.
(a) Relay pump theory – Godlewski
(b) Pulsation theory – Sir J. C. Bose
(c) Transpiration pull theory – Dixon and Jolly
(d) Capillary force theory – Munch - Unidirectional flow of water, minerals, some organic
nitrogen and hormones occurs through
(a) xylem (b) phloem
(c) root (d) vascular tissue. - Match column-I with column-II and select the correct
option from the codes given below.
Column-I Column-II
A. Vein ending (i) Transpiration
B. Necessary evil (ii) Osmosis
C. Semipermeable (iii) Transpiration pull
membrane
D. Cohesion (iv) Guttation
E. Stomata closure (v) ABA
(a) A-(iv), B-(i), C-(iii), D-(ii), E-(v)
(b) A-(iv), B-(i), C-(ii), D-(iii), E-(v)
(c) A-(iii), B-(v), C-(i), D-(ii), E-(iv)
(d) A-(i), B-(ii), C-(iii), D-(iv), E-(v) - Loss of water in the form of vapours from the living
tissues of aerial plant parts is called as
(a) transpiration (b) guttation
(c) bleeding (d) precipitation. - Rate of transpiration increases with an increase in
(a) temperature (b) light
(c) wind velocity (d) all of these.
Exam Section
- The shade of a tree is cooler than the shade of a roof
due to
(a) transpiration (b) guttation
(c) photosynthesis (d) green leaves.
(AIIMS 1995) - Transpiration can be influenced by interfering with
(a) osmotic pressure
(b) guard cell
(c) atmospheric temperature
(d) epidermis of leaf. (AFMC 1995)
3. Sir J.C. Bose proposed which of the following theories
to explain the process of ascent of sap?
(a) Pulsation theory
(b) Relay pump theory
(c) Transpiration pull theory
(d) Capillary force theory
(Karnataka1996)
4. The plants face wilting due to use of excessive fertilizers,
because of
(a) exosmosis (b) imbibition
(c) endosmosis (d) all of these.
(UP-CPMT 1998)
5. Opening and closing of stomata is due to the
(a) hormonal change in guard cells
(b) change in turgor pressure of guard cells
(c) gaseous exchange
(d) respiration.
(CBSE-PMT 2002)
6. “Transpiration is a necessary evil”, this statement belongs
to
(a) Burgerstein (b) Reschke
(c) Curtis (d) Willmer.
(Manipal 2002)
7. Opening or closing of stomata are under the control of
(a) K+ (b) P
(c) Mg (d) none of these.
(DPMT 2002)
8. Water lost by transpiration is
(a) rich in dissolved minerals
(b) rich in solutes
(c) pure water
(d) rich in dissolved salts
(Karnataka 2002)
9. Guttation is loss of water
(a) in the form of vapour
(b) in the form of liquid droplets
(c) from root
(d) through stomata.
(Manipal 2004)
10. Transpiration is very important for plants because it helps
in
(a) the absorption of water from soil
(b) the cooling of leaves at high temperature
(c) the movement of water and minerals absorbed by
roots to various parts of the plant
(d) all of the above.
(AMU 2004)