There are four known forces that are involved in evolution:

1)mutation,

2) genetic drift

3) gene flow or migration

4) selection.

TLS Online TPP Program

#Id: 5078

#Unit 6. System Physiology – Plant

Indole-3-acetic acid (IAA) occurs in all plants, Peas, for example, contain 4-chloroindole-3-acetic acid. Mustards and corn contain indole-3- butyric acid (IBA).

TLS Online TPP Program

#Id: 5079

#Unit 6. System Physiology – Plant

Structure of synthetic auxin, most synthetic auxins are used as herbicides in horticulture and agriculture.

TLS Online TPP Program

#Id: 5080

#Unit 6. System Physiology – Plant

The nuclear genes that encode messages for chloroplast proteins:  the small subunit of ribulose-1,6-bisphosphate carboxylase/oxygenase (rubisco) and the major light-harvesting chlorophyll a/b–binding proteins associated with the light-harvesting complex of photosystem II (LHCII-b proteins).

TLS Online TPP Program

#Id: 5081

#Unit 6. System Physiology – Plant

The genes for both of these proteins—RBCS and LHCB (also called CAB) —are present in multiple copies in the genome.

TLS Online TPP Program

#Id: 5082

#Unit 6. System Physiology – Plant

Circadian oscillator model

TLS Online TPP Program

#Id: 5083

#Unit 6. System Physiology – Plant

Both Phytochrome and the Circadian Rhythm regulate LHCB.