Same chapter3 marksDifficulty: Medium
Describe the carbon cycle in outline.
Ecosystem
3 marksDifficulty: Medium
Distinguish between primary and secondary ecological succession, with one example of each.
Original Khojo Papers practice question — not from a past board paper.
Answer
Primary succession begins on a bare surface where no living organism has existed before, such as newly cooled lava or a bare rock, and is very slow because soil has first to form. Secondary succession begins on a surface that has lost its community but retains its soil, such as an abandoned field or a burnt forest, and is much faster.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Both proceed through a series of seral stages to a stable climax community.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
What is primary productivity? Distinguish between gross and net primary productivity.
Ecosystem
Same chapter3 marksDifficulty: Medium
Explain the ten per cent law and why ecological pyramids of energy are always upright.
Ecosystem
Same subject3 marksDifficulty: Medium
Define apomixis and parthenocarpy, and state the practical use of each.
Sexual Reproduction in Flowering Plants
Same subject3 marksDifficulty: Medium
Describe the structure and functions of the placenta.
Human Reproduction
Same subject3 marksDifficulty: Medium
Name the hormones that control the menstrual cycle and state the function of each.
Human Reproduction