Ist  trophic level of DFC_______detritus.
Ist trophic level of GFC are producers which convert solar energy into chemicals
Which is stored in form of food, while detritus is organic remains of living
Organisms-like dead plants / animals / excreta etc.

a) The reduction in tiger population may  result in the increase of prey population (deer ), since they are not preyed upon. and increase in number of deer leads to reduction in grass
b) After the introduction of tigers, balance in nature is expected to return.

In primary succession on rock, pioneer species like lichens secrete acid which dissolve rocks helping in weathering and soil formation.

Upright, inverted and spindle-like pyramids.

Difference between terrestrial and aquatic succession.

Decomposition of detritus is carried out by microorganisms. It is basically oxygen-requiring process. Type and rate of growth as well as activity of microorganisms are affected by availability of aeration, chemical composition of delritus, pH and temperature.
1. Availability of oxygen will determine aerobic and anaerobic type of decomposers carry out partial or incomplete decomposition. Aerobic decomposers do so completely.
2. pH of the medium soil substratum shall decide the acidophilic, neutrophilic or basophilic nature of microorganisms and the type of their activity.
3. Temperature determines the rate of decomposition as both microorganisms and their exoenzymes released for decomposition show temperature related activity.
4. Chemical Composition of detritus. The decomposition rate is slow if detritus is rich in lignin and chitin, and quicker, if detritus is rich in nitrogen and water soluble substances like sugar.

Humification is the process by which detritus is changed into dark-colored amorphous substance called humus which acts as a reservoir of nutrients, while mineralisation involves the release of inorganic substances .

(i) Succession, especially primary succession, is a very slow process taking thousands of years.
(ii) Both xerarch and hydrarch successions lead to a similar climax community, i.e.mesic.

(i) Condition of the soil.
(ii) Availability of water.
(iii) Environmental conditions.
(iv) Seeds/other propagules present.

(i) Pyramid of number can look inverted in a tree ecosystem,where the single tree is the producer (first trophic level) and a number of insects are feeding on that tree (primary consumers or second trophic level).
(ii) Pyramid of biomass in a sea is generally inverted because the biomass of fishes far exceeds those of the phytoplankton,which are microscopic organisms.

Yes, the trophic level of species represents the functional level of species in the energy flow. The preference of food habit depends on the available food. A single species may occupy more than one trophic level at the same time in ecosystem. For example, sparrow is primary consumer when it eats seeds and secondary consumer when feeds on insects and worms.