Match the contents of column I, II and III Column I Column II Column III (a) Mercury (i) Air and Water I. Living Organism (b) Paedogenesis (ii) Water pollution II. Shell (animals) (c) Abiotic (iii) Resource III. Energy (d) Carbon dioxide (iv) Photosynthesis IV. Minamata (e) Food (v) Sun, Water, Wind V. Soil

Column I Column II Column III (a) Mercury (ii) Water pollution IV. Minamata Mercury was dumped together with other waste products into the Minamata bay. The Minamata bay water was constantly polluted by Mercury. People who consume this contaminated water suffered from the disease known as Minamata. Column I Column II Column III (b) Paedogenesis (v) Sun, Water, Wind I. Living organism S un, water, and wind are the physical forces that break larger rocks into smaller particles of fine minerals and contr ibute to soil weathering. Living microorganisms such as bacteria and fungi break down organic substan ces to inorganic substances and contribute to mineralization . Paedogenesis is this method of decomposition. Column I Column II Column III (c) Abiotic (i) Air and Water V. soil Abiotic factors are non-living environmental components that have a strong impact on the living components of the environment. Air, water, and soil are few of the abiotic components. These are very important for the growth and metabolism of living organisms. Column I Column II Column III (d) Carbon dioxide (iv) Photosynthesis II. shell(animals) Photosynthesis is a process in which plants use carbon dioxide, water, sunlight and chlorophyll to prepare their own food. Oxygen and food are released as by-products. Carbon from carbon dioxide dissolves in seawater to form shells of calcium carbonate CaCO 3 in combination with calcium. Column I Column II Column III (e) Food (iii) Resource III. Energy The source of food is the plants. They prepare food, i.e., glucose via photosynthesis. As it provides energy, all living organisms need food to lead their life. Food is, therefore, a resource which gives energy to living organisms.

E M B I B E

Botany Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Ecosystem>Exercise>Q 11

MEDIUM

12th Tamil Nadu Board

IMPORTANT

Earn 100

Draw a simplified model of the phosphorus cycle and label all its parts.

Important Questions on Ecosystem

MEDIUM

12th Tamil Nadu Board

IMPORTANT

Botany Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Ecosystem>Exercise>Q 12

What will happen to an ecosystem if all producers are removed?

EASY

12th Tamil Nadu Board

IMPORTANT

Botany Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Ecosystem>Exercise>Q 13

Describe the components of an ecosystem.

HARD

12th Tamil Nadu Board

IMPORTANT

Botany Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Ecosystem>Exercise>Q 22

Discuss the role of healthy ecosystem services as a prerequisite for a wide range of economic, environmental and aesthetic goods and services.

HARD

12th Tamil Nadu Board

IMPORTANT

Botany Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Ecosystem>Exercise>Q 23

Match the contents of column I, II and III

Column I	Column II	Column III
(a) Mercury	(i) Air and Water	I. Living Organism
(b) Paedogenesis	(ii) Water pollution	II. Shell (animals)
(c) Abiotic	(iii) Resource	III. Energy
(d) Carbon dioxide	(iv) Photosynthesis	IV. Minamata
(e) Food	(v) Sun, Water, Wind	V. Soil