Fossil evidence indicates that the following events occurred in what sequence, from earliest to most recent?

1. Protostomes invade terrestrial environments.

2. Cambrian explosion occurs.

3. Deuterostomes invade terrestrial environments.

4. Vertebrates become top predators in the seas.

#Question id: 10774

#SCPH05 I Biotechnology

Following are a few statements regarding the structure of terpenes:

a) Isopentenyl diphosphate and Dimethyallyl diphosphate are combinely called monoterpene, respectively

b) Isopentenyl diphosphate and Farnesyl diphosphate are Sesquiterpenes and Tetraterpenes

c) Monoterpenes, Sesquiterpenes and Diterpenes have 10, 20  and 30 carbons, respectively

d) Grenyl grenyl diphosphate usually have 20 carbons compound by multiplying with  2X is known as testraterpenes

Which combination of the above statements is correct?

#Question id: 10775

#I Life Science/ Life Sciences Group – I-V

Geranyl diphosphate is a precursor of which plant hormone biosynthesis?

#Question id: 10775

#SCPH05 I Biotechnology

Geranyl diphosphate is a precursor of which plant hormone biosynthesis?

#Question id: 10776

#I Life Science/ Life Sciences Group – I-V

pyrethroids that occur in the leaves and flowers of Chrysanthemum species show very striking insecticidal activity. Pyrethroids are________

#Question id: 10776

#SCPH05 I Biotechnology

pyrethroids that occur in the leaves and flowers of Chrysanthemum species show very striking insecticidal activity. Pyrethroids are________

#Question id: 10777

#I Life Science/ Life Sciences Group – I-V

Why pyrethroids are synthetically and commercially viable and applicable ?