Outline salient features of carbon cycling in an ecosystem.

Write important features of a sedimentary cycle in an ecosystem.

Write the salient features of valence bond theory.

Write a note on ecosystem.

Give an account of energy flow in an ecosystem.

Name four important salient features of phylum Echinodermata.

Study the given flow chart and select the correct statement regarding this. (i) It represents phosphorus cycling in a terrestrial ecosystem. (ii) It represents phosphorus cycling in an aquatic ecosystem. (iii) Natural resenvoir of phosphorus is phosphate rocks. (iv) There is no repiratory release of phosphorus into atmosphere. (v) Gaseous exchange of phosphorus between organisms and enviornment occurs to a considereable extent.

Describe the salient features of gravitational force.

Unambiguous, universal and degenerate are some of the terms used for the genetic code. Explain the salient features of each of them.

State the function of a reservoir in a nutrient cycle. Explain the simplified model of carbon cycle in nature.