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- Name the growth regulators used in plant tissue culture and also state their functions.Fusicoccin is a fungal toxin that stimulates the plasmamembrane H+pumps of plant cells. How may it affect thegrowth of isolated stem sections?Arrange the following subset of cell depreciation during plant growth ( in length ) in the correct sequence . 1) cell division in primary meristem . 2) cell division in apical meristem . 3) differentiated cells . 4) growing cells in primary meristem.
- Name a growth inhibitor in plant.Detection of external signals by plant cells often results in a transient rise in the concentration of Ca2+ ions in the cytoplasm. What transport processes can cause such an increase in cytoplasmic Ca2+, and what transport processes can remove the excess Ca2+ and restore the level of Ca2+ to its resting state?The figure attached shows an open stoma during a gaseous exchange process in a plant. A) What is 'y'? B) Elaborate the gaseous exchange process in plants by considering the influence of 'y' on the turgidity of guard cells.
- Explain what occurs during each of the 3 phases of growth?Give an example of an environmental condition where stomates are unable to maintaincooling of the leaf and heat stress occurs. Explain the consequences of heat stress onphotosynthesis, membrane integrity and proteins.Does cell turgor control the overall turgor of tissues? Does cell turgor control the overall turgor of the plant such as leaf or stem? Explain
- Identify major pathways where moleculescan be redirected or converted into usefulcell products.Will there be growth or no growth?Plants under biotic stress will rapidly increase concentration of reactive oxygen species (ROS). (i) The above oxidative burst will happen at cellular level. Describe the observable symptoms by naked eyes and explain the symptoms development at cellular level. (ii) Explain the roles of ROS in plant defense. (iii) Which part of plant cell initiates oxidative burst?