52 public questions tagged with this topic.
Amino acid supplements in tissue culture media provide essential amino acids required for plant cell_x000D_ growth.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Agricultural Applications - Nutritional Enhancement - Golden Rice and GM Crops
Cyanobacteria like Nostoc and Anabaena are free-living nitrogen-fixing organisms that enhance soil fertility.
Ref: NCERT Class 12 Biology Chapter 8: Microbes in Human Welfare Microbes as Biofertilizers - Rhizobium Azospirillum Mycorrhiza Cyanobacteria
The log (exponential) phase of the sigmoid growth curve represents rapid cell division and maximum growth rate.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Photoperiodism Vernalisation and Development
Plant growth is irreversible and results from cell division and enlargement. Primary growth increases length, while secondary growth increases thickness and is common in dicots, not monocots.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Photoperiodism Vernalisation and Development
Geometric growth, which includes lag, log, and stationary phases, produces an S-shaped (sigmoid) curve.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Photoperiodism Vernalisation and Development
Arithmetic growth results in a linear curve, as one daughter cell divides while the other differentiates.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Photoperiodism Vernalisation and Development
The stationary phase is represented by a plateau in the sigmoid growth curve, where the growth rate stabilizes.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Photoperiodism Vernalisation and Development
In geometric growth, plotting growth against time results in an exponential curve during the log phase.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Photoperiodism Vernalisation and Development
Gibberellins stimulate the production of enzymes like alpha-amylase, which breaks down starch during seed germination. Water, temperature, and oxygen are essential for germination.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Photoperiodism Vernalisation and Development
The lag phase is the initial phase with slow growth, preparing cells for rapid division in the log phase.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Photoperiodism Vernalisation and Development
Charles Darwin and his son Francis demonstrated that the tip of the coleoptile produces auxin, which causes phototropic bending.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Photoperiodism Vernalisation and Development
Kinetin is a cytokinin that promotes cell division (cytokinesis) and is widely used in tissue culture.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Photoperiodism Vernalisation and Development
