The rupture and fractionation do not usually occur in water column in vessel/tracheids during the ascent of sap because of
Lignified thick walls
Cohesion and adhesion
Weak gravitational pull
Transpiration pull
B.
Cohesion and adhesion
The vertical conduction of water from root to arial part of a plant is called ascent of sap. The water molecules remain joined to each other due to a force of attraction called cohesion force. The attraction between water molecules and the walls of xylem is due to adhesion forces. These forces help to ensure the continuity of the water column in xylem.
A monocarpic plant is one, which
has only one carpel
Flowers once in a life-time
Produces only one seed
Produces only one fruit
In some organisms, karyokinesis is not followed by cytokinesis as a result of which, the multinucleate condition arises leading to the formation of the syncytium. The perfect example of this is
The appearance of a furrow in the cell membrane
Liquid endosperm in coconut
Sexual reproduction
Fertilization
Which one of the following pairs, is not correctly matched?
Abscisic acid - Stomatal closure
Gibberellic acid - Leaf fall
Cytokinin - Cell division
IAA - Cell wall elongation
Which one of the following pair is not correctly matched?
Almond-Drupe
Brinjal-Berry
Guava-Pepo
Loquat-Pome
Compare the statements I and II and choose the correct option.
Statement (I) Auxin promotes apical dominance by suppressing the activity of lateral buds.
Statement (II) In moriculture, periodic pruning of shoot tips is done to make mulberry plants bushy.
Choose the correct options
I is false, but II is true
II is false, but I is true
Both I and II are true
Both I and II are false
The quiescent centre in root meristem serves as a
Site for storage of food, which is utilised during maturation
Reservoir of growth hormones
Reserve for replenishment of damaged cells of the meristem
Region for absorption of water
