Which of the following is non-symbiotic nitrogen fixer organism?
VAM
Azotobacter
Anabaena
Rhizobium
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.
The material, which arrests cell division, is obtained from
Crocus
Colchicum
Dalbergis
Chysanthomum
Which of the following is responsible for biological nitrogen-fixation?
Nife gene
Nitrogenase
Yeast alanin tRNA synthetase
RNA synthetase
The respiratory quotient during cellular respiration would depend on the
Nature of the enzymes involved
Nature of the substrate
Amount of carbon dioxide released
Amount of oxygen utilized
Which of the following supports a dense population of plankton and littoral vegetation?
Oligotrophic
Eutrophic
Lithotrophic
Agroecotrophic
Three floral diagrams are given here. Their respective families are assigned in the answer key. Find out the families to which these diagrams belong to
A-Liliaceae, B-Asteraceae, C-Solanaceae
A-Asteraceae, B-Solanaceae, C-BRassicaceae
A-Asteraceae, B-Solanaceae, C-Asteraceae
A-Poaceae, B-Solanaceae, C-Asteraceae