Why are oceans least productive ?
Sea/ocean is less producer because $(i)$ It receives solar radiation in insufficient amount because sunlight decreases as the depth of sea increases.
$(ii)$ Sea water lacks Nitrogen, Which is an important nutrient substance for plants.
$(iii)$ Excessive amount of salts is not favourable for all plants.
$(iv)$There is no base to support plants
Among the following, what happens in abiotic components of an ecosystem
A plant being eaten by a herbivorous which in turn is eaten by a carnivorous makes
The percentage of light energy utilized for photosynthesis by higher plants is
Consider the following statements about food chain
$I.$ The transfer of energy from producers to top consumers through a series of organisms is called food chain
$II.$ A food chain is always straight and proceeds in a progressive straight line
$III.$ In a food chain, there is unidirectional flow of energy from sun to producers and subsequently to series of different types of consumers
Which of the statements given above are correct?