β-Carotene is the precursor of vitamin A1.
Oxidation at C-15 converts retinol to the aldehyde, retinal, and further oxidation produces retinoic acid, a hormone that regulates gene expression. 

TLS Online TPP Program

#Id: 8127

#XL - T Zoology

β-Carotene is the precursor of vitamin A1.
Oxidation at C-15 converts retinol to the aldehyde, retinal, and further oxidation produces retinoic acid, a hormone that regulates gene expression. 

TLS Online TPP Program

#Id: 1971

#XL - T Zoology

The number alive during an age class can be estimated by the relationship:

TLS Online TPP Program

#Id: 1972

#XL - T Zoology

Life expectancy - The average number of additional age classes an individual can expect to live at each age.

TLS Online TPP Program

#Id: 1973

#XL - T Zoology

T_x (total years lived) is calculated by summing the values of Lx in age class x and all subsequent (older) age classes.

TLS Online TPP Program

#Id: 1974

#XL - T Zoology

Quadrate method

TLS Online TPP Program

#Id: 1975

#XL - T Zoology

If this ratio R is equal to 1, then the population is randomly dispersed.

If R is significantly greater than 1, the population is evenly dispersed

If R is significantly less than 1, the population is clumped

TLS Online TPP Program

#Id: 1976

#XL - T Zoology

Abundance- Its size—the total number of individuals in the population that exist with in a defined area.