ABA causes stomata to close by reversing the accumulation of potassium salts in guard cells and inducing the conversion of sugars into starch. 

The resulting fall in solute concentration leads to loss of water from the guard cell into the apoplast by osmosis, a fall in guard cell turgor, and closing of the stomatal pore. 

TLS Online TPP Program

#Id: 9002

#Unit 6. System Physiology – Plant

Prior to CO2 fixation, Activation of RUBISCO/Carbamylation of RUBISCO takes place

1. Two protons are released. 

2. Binding of CO2 molecule on NH2 group

3. Binding of Mg2+ concentration upon illumination

TLS Online TPP Program

#Id: 1472

#Unit 4. Cell Communication and Cell Signaling

The major classes of ECM molecules are: 

• Proteoglycans

• Collagens

• Multi-adhesive matrix proteins

 

TLS Online TPP Program

#Id: 8234

#Unit 10. Ecological Principles

Negative density dependence occurs when the rate of population growth decreases as population density increases.

Ex - limited supply of resources, such as food, nesting sites, and physical space.

TLS Online TPP Program

#Id: 4519

#Unit 13. Methods in Biology

TLS Online TPP Program

#Id: 9098

#Unit 4. Cell Communication and Cell Signaling

Glycogen breakdown and synthesis is coordinately regulated by the second messengers Ca2+ and cAMP, whose levels are regulated by neural and hormonal stimulation, respectively