Succession of plants

Q. Succession proceeds from:

1. Xeric $\to$ Mesic conditions
2. Hydric $\to$ Mesic conditions
3. Mesic $\to$ Xeric conditions
4. Both a and b are correct

Q.

Which of the following is the order of succession in a hydrosere?

I. Rooted aquatic plants-> phytoplankton->Free floating stage->Reed swamp stage-> Climax forest-> wood land stage-> Sedge Meadow stage

II. Rooted aquatic plants-> wood land stage->Rooted floating stage-> Sedge Meadow stage-> Reed swamp stage-> phytoplankton-> Climax forest

III. Phytoplankton->Rooted aquatic plants->Free floating stage->Reed swamp stage-> wood land stage-> Sedge Meadow stage-> Climax forest

Iv. Phytoplankton->Rooted aquatic plants->Rooted floating stage->Reed swamp stage->Sedge Meadow stage-> wood land stage-> Climax forest.

1. I and IV

2. Only IV

3. Only III

4. III and II

Q. In ecological succession, from pioneer to climax community, the biomass shall

1. decrease
2. increase and then decrease
3. no relation
4. increase continuously

Q. Choose the most appropriate explanation for ecological succession

1. The replacement of closely related species at successive altitudes up a mountain.
2. The successive colonization of a site by certain species accompanied by the extinction of others.
3. The synchronous ageing of a cohort of animals born at the same time.
4. The successive links in a food chain from plants to herbivores to carnivores.