I. Biome is the most extensive ecosystem unit.
II. Biomes are divided into several regions on the basis of climatic variation.
III. Plant communities are more dominant in biomes.
Which of the above statements is/are correct?

I. The Mediterranean vegetation is characterised by mixed evergreen forests to woodlands and scrubs.
II. The scrubs are named differently in various parts of the biome.

I. These grasslands are located in the interior of continents.
II. Temperate grasslands of the Southern hemisphere are characterised by a moderate climate.
III. Steppe grasslands have a higher annual range of temperature.

I. The crops mainly grow in A and B horizons.
II. The largest organic matter accumulates in A-horizon.
III. The C-horizon is not influenced by soil forming processes.

I. A cold and humid climate is most favourable for podzolisation.
II. The process of laterisation removes silica from soil.
III. Warm and tropical climate is most favourable for laterisation.

I. A soil profile is a horizontal cross section of the soil.
II. The C-horizon is termed as sub-stratum.
III. The B-horizon is also known as zone of accumulation.
Choose the statement/s which is/are correct?

I. In an ecological succession, pioneer community gradually develops into vegetation climax.
II. There is interspecific competition during an ecological succession.
III. When vegetation community is disturbed before reaching climax, it results in sub-climax community.

I. Savanna region is characterised by distinct dry and wet seasons.
II. Savanna biome is dominated by grasses.
III. Some of savanna trees are pyrophytic.