- The following figure shows the stomatal apparatus.
Identify the parts labelled as A, B, C and D and choose
the correct answer from the following.
(a) A = Guard cells, B = Stoma,
C = Chloroplasts, D = Subsidiary cells
(b) A = Subsidiary cells, B = Chloroplasts,
C = Stoma, D = Guard cells
(c) A = Guard cells, B = Chloroplasts,
C = Stoma, D = Subsidiary cells
(d) A = Subsidiary cells, B = Stoma,
C = Chloroplasts, D = Guard cells
(Karnataka 2005)
- In which of the following plants, there will be no
transpiration?
(a) Aquatic, submerged plants
(b) Plants living in deserts
(c) Aquatic plants with floating leaves
(d) Plants growing in hilly regions (Karnataka 2005)
- Upward movement of water in plants is called
(a) sucking (b) ascent of sap
(c) translocation (d) none of these.
(Odisha 2006)
- Sunken stomata are found in
(a) xerophytes (b) hydrophytes
(c) mesophytes (d) all of these.
(Odisha 2006)
- The rupture and fractionation do not usually occur in
the water column in vessel/tracheids during the ascent
of sap because of
(a) weak gravitational pull
(b) transpiration pull
(c) lignified thick walls
(d) cohesion and adhesion.
(CBSE-PMT 2008)
- Which of the following chemical serves as an
antitranspirant in plants?
(a) Cobalt chloride
(b) Dimethyl mercury
(c) Potassium iodide
(d) Phenyl mercuric acetate (BHU 2008)
17. Which of the following does not cause opening of
stomata?
(a) Light
(b) Increased pH
(c) Reduced pH
(d) Low CO 2 concentration (DPMT 2008)
18. Stomatal opening or closing is assisted by
(a) change in the turgidity of guard cells
(b) the inner walls of each guard cells which are thick
and elastic
(c) cellulose microfibrils of guard cells, oriented
radially
(d) all of the above. (AMU 2010)
19. Which of the following is not a purpose of trans-
piration?
(a) Transports minerals from the soil to all parts of the
plant
(b) Helps in translocation of sugars from source to
sink
(c) Maintains shape and structure of the plants
(d) Cools leaf surfaces (Kerala 2010)
20. In land plants, the guard cells differ from other epidermal
cells in having
(a) cytoskeleton
(b) mitochondria
(c) endoplasmic reticulum
(d) chloroplasts. (AIPMT Prelims 2011)
21. Accumulation of which one of the following acids results
into closure of stomata?
(a) Malic acid
(b) Aspartic acid
(c) Phosphoenol pyruvic acid
(d) Oxaloacetic acid
(AMU 2011)
22. Radial conduction of water takes place by
(a) vessels (b) vessels and trachieds
(c) phloem (d) ray parenchyma cells.
(AMU 2012)
23. Force generated by transpiration can create pressure
sufficient to lift water even upto the height of
(a) 130 feet (b) 130 metre
(c) 230 feet (d) 230 metre.
(AMU 2012)
24. Stomata open at night in
(a) hydrophytes (b) succulents
(c) mesophytes (d) halophytes.
(Odisha 2012)
