Ecology

 Alpine meadows are seen where sediments from the weathering of rocks have produced soils, which are developed enough to support plants like grasses and sedges.

Among the elements listed, only carbon has a significant atmospheric phase in its biogeochemical cycle - as CO2 in the atmosphere. Sodium, phosphorus, and magnesium cycle primarily through rocks, water, and organisms without a major atmospheric reservoir. Carbon cycles through atmosphere (CO2), oceans (dissolved CO2, carbonates), biosphere, and lithosphere.

Circulation of a exchange of biogeneric non gaseous nutrients between living and non living world is called sedimentary type of biogeochemical cycle e.g. phosphorus and sulphur.

The hotspot concept was developed by Norman Myers (not Mayers) to designate priority areas for IN-SITU conservation (protecting species in their natural habitats), not ex-situ conservation. Ex-situ conservation involves zoos, seed banks, etc. Option D is correct in identifying this statement as false due to the wrong conservation type and name spelling error.

r-selected species are adapted for rapid reproduction in unstable environments. Their key characteristics include: small adult size, short generation time (NOT long), high energy allocation to reproduction, and maximum population growth rate. Long generation time is a K-selected trait - these species invest more in fewer offspring and live in stable environments.

Secondary succession occurs when an existing ecosystem is disturbed but the soil remains intact. After a forest fire, herbs and grasses are typically the first to recolonize the area because they grow quickly from seeds or roots that survived in the soil. Primary succession would occur on bare rock with no soil, while a climax stage represents the final stable community.

Shifting cultivation (also called jhum or slash-and-burn) traditionally involves clearing small forest plots by cutting and burning vegetation, growing crops for local consumption, then moving to new areas when soil fertility declines. Regular pesticide application is not characteristic of this traditional practice - it's more associated with modern intensive agriculture. Farmers using shifting cultivation rely on natural soil recovery rather than chemical inputs.

Standing crop refers to the total biomass of living organisms (plants and animals) present in an ecosystem at a given time - it's organic matter, not inorganic. Inorganic matter would refer to non-living components like minerals, water, or gases. The other definitions are correct: limnology studies freshwater, phenology studies seasonal periodic changes, and autoecology studies individual species' environmental interactions.

The 10% rule is a fundamental principle of ecological energy transfer - only about 10% of energy from one trophic level is converted into biomass of the next level. The remaining 90% is lost primarily through respiration (as heat) and incomplete consumption/digestion. Ecological efficiency is actually lowest for top consumers due to cumulative energy losses, and energy transfer varies but averages around 10%, not exactly 25%.

Energy decreases at each trophic level due to inefficient energy transfer (approximately 10% efficiency), so higher trophic levels have progressively less energy available to support them. By the 3rd or 4th level, there's insufficient energy to sustain viable populations. Energy quality doesn't increase in a meaningful way, and while energy flow is unidirectional, that doesn't limit chain length - the quantitative energy loss does.

 Nitrification involves oxidation of nitrogen compounds.  The decomposers carry out a process called deamination which results in the release of ammonia. Ammonia undergoes oxidation to give nitrates.

A deme is a term used for a local population of organisms of one species that actively interbreed with one another and share a distinct gene pool.

All four statements are factually correct in evolutionary biology. Genetic diversity does provide extinction resistance by ensuring some individuals may survive environmental changes. Differential reproduction (natural selection) is the mechanism by which favorable adaptations spread. Geographic isolation is indeed a key speciation mechanism. Paleontologists do estimate that over 99% of all species that ever existed are now extinct. Since all statements are true, none are false.

Decomposers (bacteria and fungi) break down organic nitrogen compounds in dead organisms and waste products, releasing ammonia (NH3) into the soil through ammonification. This makes nitrogen available again for plants to use. Option A describes nitrogen fixation (by nitrogen-fixing bacteria), option C describes denitrification (by denitrifying bacteria), and option D describes assimilation (by plants, not decomposers).