is called Programmed Cell Death (PCD). The final stage of senescence is abscission. Abscission is a physiological process of shedding of organs from the parent plant body. Evaluation .
Select the wrong statement from the following: a. Formative phase of the cells retain the capability of cell division. b. In elongation phase development of central vacuole takes place.
c. In maturation phase thickening and differentiation takes place. d. In maturation phase, the cells grow further.
. If the diameter of the pulley is inches, length of pointer is inches and distance travelled by pointer is inches. Calculate the actual growth in length of plant. a.
.5inches b. inches c. inches d. inches .
is the powerful growth inhibitor a. Ethanol b. Cytokinins c. ABA d.
Auxin . Select the correctly matched one A) Human urine i) Auxin –B B) Corn gram oil ii) GA C) Fungus iii) Abscisic acid II D) Herring fish iv) Kinitin sperm E) Unripe maize v) Auxin A grains F) Young cotton vi) Zeatin bolls a) A-iii, B-iv, C-v, D-vi, E-i, F-ii, b) A-v, B-i, C-ii, D-iv, E-vi, F-iii, c) A-iii, B-v, C-vi, D-i, E-ii, F-iv, d) A-ii, B-iii, C-v, D-vi, E-iv, F-i Summary Growth occurs by cell division, cell elongation and cell maturation. The first phase is lag phase, the second is log phase and the final phase is steady state phase. The log phase is otherwise known as exponential phase .
The three phases are collectively called Grand period of growth. Plant growth and development are controlled by both internal and external factors. The internal factors are chemical substances called Plant Growth Regulators (PGRs). The hormones are classified into five groups: Auxins, gibberellins, cytokinins, abscisic acid and ethylene.
These PGRs are synthesized in various parts of the plant. PGRs may act synergistically or antagonistically. Mechanism of flowering is controlled by light period (photoperiodism) and temperature (vernalization). The physiological changes on flowering with effect from relative length of light and darkness (photoperiodism) are called photoperiodism.
A bluish biliprotein responsible for the perception of light