Give three hypothesis for explaining why tropics show greatest levels of species richness .

Assertion : Biodiversity hotspots are the regions which possess high levels of species richness, high degree of endemism and no loss habitats. Reason : Total number of biodiversity hotspots in the world is 32 with two of these hotspots found in India. (a) If both assertion and reason are true and reason is the correct explanation of assertion. (b) If both assertion and reason are true but reason is not the correct explanation of assertion. (c) If assertion is true but reason is false. (d) If both assertion and reason are false.

Which of the following statements regarding biodiversity hotspots are incorrect? (i) High endemism (ii) High level of species richness (iii) Total number is 34 in the world (iv) Five of these occur in India (v) High alien species invasion (vi) Cover less than 2% of the earth's land area, but if properly conserved, they can reduce extinctions by about 30% (a) (i) and (ii) (b) (iv) and (v) (c) iv), (v) and (vi) (d) (iii), (iv), (v) and (vi)

Why biodiversity is rich in tropics ?

Explain why Zn shows only +2 oxidation state ?

In the tropical rainforest, the majority of trees have showy animal-pollinated flowers. In temperate forests the majority of trees are wind pollinated. Which factors best explain these contrasting patterns ? (i) Wind is rare in tropical forests. (ii) Because of high species diversity in the tropics, individuals of trees species are often widely separated making wind an inefficient means of pollen dispersal. (iii) More opportunities for coevolved mutualisms exist in tropical forests because of the high diversity of animal species. (iv) Trees in tropical forests are mostly evergreen and year-round leaf canopies impede pollen dispersal by wind. (v) Flowering in tropical forests occurs over a short period of time when wind is absent. (a) (i) , (ii) and (v) (b) (i),(iii) and (v) (c) (ii), (iii) and (iv) (d) (ii) and (iv)

The given table shows ome information about the trophic levels of a food chain {:("Trophic level"" "underset("trophic level")("Energy in the")" "underset("of organisms")("Number")),(" P 10,000 kJ 1000"),(" Q 200 kJ 10"),(" R 100,000 kJ 1"),(" S 2000 kJ 500"):} Select the option with correct order of tropic levels in a food chain

If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be

Write the three forms of iron and give reason, why they are different from each other?