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Envs 121: Environmental Systems Year 2011 Question Paper

Envs 121: Environmental Systems Year 2011

Course:Bachelor Of Environmental Science

Institution: Kabarak University question papers

Exam Year:2011

INSTRUCTIONS:
ANSWER ALL QUESTIONS IN SECTION A AND ANY TWO IN SECTION B

SECTION A - 40 Marks -Answer all questions
1. Explain the composition and functions of the following
a) Hydrosphere [3 mks]
b) Atmosphere [3 mks]
c) Lithosphere [3 mks]
d) Biosphere [3 mks]
2. Explain the differences and importance of the two systems mentioned
a) Solar system [3 mks]
b) Earths system [3 mks]
3. How do you explain the existence of the earth and origin of life. [6 mks]
4. a) Define the term biogeochemical cycle [2 mks]
b) Explain the importance following cycles in our environment
i) Carbon ii) Water iii) Nitrogen [6 mks]
5. Discuss the following processes in ecosystems
a) Photosynthesis [2mks]
b) Decomposition [2mks]
c) Precipitation [2mks]
d) Water run off [2mks]

SECTION B - 20 MARKS (Answer any two questions)
6. Discuss interactions that take place between the oceans and atmosphere. [10 mks]
7. Discuss the role of human in modification of the environmental system. [10 mks]
8. Discuss the functions and importance of tectonic activities and other natural.
activities in balancing the earths system. [10 mks]

Envs 121: Environmental Systems Year 2011 Question Paper

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