Ecological Succession and Services

How human beings interact with environment and modify it according to their needs?

In which stage of hydrosere most plant expose to air?

Which one is correct for secondary succession

1. Formed by aggregation

2. Follows primary succession

3. Occurs on a deforested site

4. Beings on bare rock

The following are ecosystem services except

Out of the total cost of various ecosystem services, the soil account for _____%, recreation and nutrient cycling are less than _____% and climate regulation and habitat for wildlife is about _____% each.

Global GNP is about:

What is correct about primary succession, initially –

The first stage in a xerosere is:

Secondary succession

Researchers like Robert Costanza et al., have put an average price tag of US ...... trillion a year on the fundamental ecological services.

In hydrarch succession

Which of the following places are suitable sites for secondary succession?
(a) Cooled volcanic lava
(b) Sand dunes
(c) Abandoned farm lands
(d) Igneous rocks
(e) Burned or cut forests
(f) Flooded lands

Out of total cost of various ecosystem services, the soil formation accounts for about $\underline{ \mathrm{A} }$,  and contribution of other services like recreation and nutrient cycling, are less than $\underline{ \mathrm{B} }$ each.
In the above statement for $\text{'}\mathrm{A}\text{'}$ and $\text{'}\mathrm{B}\text{'}$, which option is correct ?

During the process of ecological succession

Succession stages that occur on rock is called

During primary succession on rocks, pioneer species are

Hydrarch succession proceeds from

What is incorrect about primary succession?

In the hydrosere the reed-swamp stage is followed by