Home
Class 12
BIOLOGY
Primary succession on the rocks is calle...

Primary succession on the rocks is called xerosere. Answer the following .
(i) Name the pioneer community
(ii) Organic acids have important role in this succession Justify.

Text Solution

Verified by Experts

(a) Pioneer community on the xerosere (bare rocks) is formed of lichens.
(b) Acids produced by the lichens weathering of rocks which initiates the soil formation also releases the essential minerals for proper growth.
Promotional Banner

Topper's Solved these Questions

  • ECOSYSTEM

    MODERN PUBLICATION|Exercise REVISION EXERCISES (III. SHORT ANSWER TYPE - I QUESTIONS) (B. QUESTIONS FROM CBSE EXAMINATIONS)|16 Videos

  • ECOSYSTEM

    MODERN PUBLICATION|Exercise REVISION EXERCISES (IV. SHORT ANSWER TYPE - II QUESTIONS) (A. QUESTIONS FROM STATE BOARD EXAMINATIONS)|29 Videos

  • ECOSYSTEM

    MODERN PUBLICATION|Exercise REVISION EXERCISES (II. VERY SHORT ANSWER QUESTIONS) (B. QUESTIONS FROM CBSE EXAMINATIONS)|10 Videos

  • BIOTECHNOLOGY AND ITS APPLICATIONS

    MODERN PUBLICATION|Exercise CHAPTER PRACTICE TEST (SECTION - E)|2 Videos

  • EVOLUTION

    MODERN PUBLICATION|Exercise CHAPTER PRACTICE TEST (SECTION-D)(CASE-BASED SHORT ANWER )(THREE MARK EACH)|2 Videos

Similar Questions

Explore conceptually related problems

which of the following forms the pioneer community in hydrarch succession?

Which of the following forms pioneer community in hydrarch succession?

In primary succession on rocks, the pioneer species are usually:

Name the pioneer species that invade in primary succession on bare rock and in water.

Starting from the pioneer species, trace the sequence that follows in an ecological succession on a bare rock, until climax community is reached in an ecosystem. Name this type of succession.

Name the metals which are extracted from the following ores : (i) Bauxite (ii) Rock salt (iii) Haematite (iv) Calamine (v) Cinnabar

Antibiotics are the chemicals obtained from the useful micro-organisms and employed to kill some harmful micro organisms. But all the antibiotics do not have medicinal importance. Answer the following questions related to antibiotics: (i) List the properties of the antibiotics to be used in medicines. (ii) Discovery of penicillin is said to be a serendipity. Why is it called so? (iii) Name the source of streptomycin antibiotic.

MODERN PUBLICATION-ECOSYSTEM -REVISION EXERCISES (III. SHORT ANSWER TYPE - I QUESTIONS) (A. QUESTIONS FROM STATE BOARD EXAMINATIONS)
  1. In food chain , the herbivores are called connecting link between prod...

    Text Solution

    |

  2. Given below are the components related to simplified model of mineral ...

    Text Solution

    |

  3. Primary succession on the rocks is called xerosere. Answer the followi...

    Text Solution

    |

  4. Draw a diagrammatic sketch of phosphorus cycle.

    Text Solution

    |

  5. State two laws of thermodynamics to explain flow of energy in an ecosy...

    Text Solution

    |

  6. What is food chain ? Draw a food chain.

    Text Solution

    |

  7. What is Ecological efficiency ? Explain its significance ?

    Text Solution

    |

  8. Explain the characteristics of food web.

    Text Solution

    |

  9. Write notes on : (i) Food chain (ii) Trophic level.

    Text Solution

    |

  10. State differences between grazing food chain and detritus food chain.

    Text Solution

    |

  11. Write four characteristics of food chain.

    Text Solution

    |

  12. Nutrients are never lost from the ecosystems . Write about (a) Gaseous...

    Text Solution

    |

  13. Ecological pyramids are usually upright. Meanwhile some pyramid of bio...

    Text Solution

    |

  14. Name various biomes of India.

    Text Solution

    |

  15. Why earthworms are referred to as Farmer's friends and what is the rol...

    Text Solution

    |

  16. What do you mean by gaseous and sedimentary nutrient cycle ? Give an e...

    Text Solution

    |

  17. Briefly explain 10% law of energy transfer in an ecosystem.

    Text Solution

    |

  18. Draw a pyramid of biomass in a terrestrial habitat.

    Text Solution

    |

  19. What is meant by ecological pyramid ? Name the different types of ecol...

    Text Solution

    |

  20. Differentiate between production and decomposition.

    Text Solution

    |