In the absence of gibberellin, the DELLA proteins positively regulate GID1, GA20ox, and GA3ox (plus signs), and negatively regulate GA2ox (minus sign). Conversely, both bioactive gibberellin and the GID1 receptor enhance DELLA repressor degradation (plus signs), while GA2ox blocks DELLA repressor degradation (minus signs).

TLS Online TPP Program

#Id: 2184

#Unit 10. Ecological Principles

Causes Succession

TLS Online TPP Program

#Id: 2185

#Unit 10. Ecological Principles

Allogenic factors –  Chemical weathering of rocks or filling in by sand/silt in a pond

Autogenic factors– Autogenic factors include – Immigration, Growth, Reaction, Coactions

TLS Online TPP Program

#Id: 2186

#Unit 10. Ecological Principles

TLS Online TPP Program

#Id: 2187

#Unit 10. Ecological Principles

Step in succession

1. Nudation 

2. Migration 

3. Ecesis 

4. Aggregation

5. Competition 

6. Reaction 

7. Stabilization

TLS Online TPP Program

#Id: 2188

#Unit 10. Ecological Principles

Primary succession - refers to succession on a newly exposed site that was not previously occupied by soil and vegetation.

Secondary succession - refers to succession on a site that has already supported life but that has undergone a disturbance.

TLS Online TPP Program

#Id: 2189

#Unit 10. Ecological Principles

Primary succession