A thin film of water, held by the soil particles, under the influence of internal attractive forces, is called which of the following water?
Options
(a) capillary (b) combined (c) hygroscopic (d) gravitational
A professor kept some moist seeds in an air-tight jar and started lecturing. At the end of the experiment an explosion occurred in the jar. What did the professor want to explain
Options
A plant that manufactures its own food is
Options
(a) Autotroph (b) Parasite (c) Epiphyte (d) Saprophyte
Correct Answer:
Autotroph
Explanation:
Autotrophs are green plants capable of synthesizing their own food from raw […]
A metal ion involved in stomatal regulation is
Options
(a) iron (b) potassium (c) zinc (d) magnesium
Correct Answer:
potassium
Explanation:
Stomata are small pores in plant epidermis,present in large numbers,particularly in leaves,through […]
A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is pholem sap? […]
A cell when dipped in 0.5 M sucrose solution has no effect but when the same cell will be dipped in 0.5 M NaCl solution the cell will.
Options
(a) increases in size […]
0.1M solution of a solute has a water potential of
Options
(a) -2.3 bars (b) 0 bar (c) 22.4 bars (d) 2.3 bars
Correct Answer:
-2.3 bars
Explanation:
1 M solution of a […]
Wilting of plant is due to
Options
(a) blocked xylem (b) blocked phloem (c) removal of epidermis and few roots (d) removal of pith
Correct Answer:
blocked xylem
Explanation:
Wilting of plant is […]
Who proposed cohesion theory of water movement in plants?
Options
(a) J C Bose (b) Priestly (c) Dixon and Jolly (d) TV Engelmann
Correct Answer:
Dixon and Jolly
Explanation:
Cohesion-tension theory was proposed […]
Which one of the following elements is necessary for the translocation of sugars in plants
Options
(a) Iron (b) Manganese (c) Molybdenum (d) Boron
Correct Answer:
Boron
Explanation:
Boron is highly essential for […]
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