{"id":17971,"date":"2021-02-05T11:38:32","date_gmt":"2021-02-05T06:08:32","guid":{"rendered":"https:\/\/ncertsolutions.guru\/?p=17971"},"modified":"2021-02-05T11:40:27","modified_gmt":"2021-02-05T06:10:27","slug":"ncert-solutions-for-class-11-geography-chapter-15-part-a","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-11-geography-chapter-15-part-a\/","title":{"rendered":"NCERT Solutions for Class 11 Geography Chapter 15 Life on the Earth"},"content":{"rendered":"

Detailed, Step-by-Step NCERT Solutions for Class 11 Geography<\/a> Chapter 15 Life on the Earth Questions and Answers were solved by Expert Teachers as per NCERT (CBSE) Book guidelines covering each topic in chapter to ensure complete preparation.<\/p>\n

Life on the Earth NCERT Solutions for Class 11 Geography Chapter 15<\/h2>\n

Life on the Earth Questions and Answers <\/span>Class 11 Geography Chapter 15<\/h3>\n

Question 1.
\nMultiple Choice Questions :
\n(i) Which one of the following is included in biosphere?
\n(a) only plants
\n(b) all living and non-living organisms
\n(c) only animals
\n(d) all living organisms
\nAnswer:
\n(b) all living and non-living organisms.<\/p>\n

(ii) Tropical grasslands are also known as ……………..
\n(a) the prairies
\n(b) the savannas
\n(c) the steppes
\n(d) none of the above
\nAnswer:
\n(b) the savannas.<\/p>\n

\"NCERT<\/p>\n

(iii) Oxygen combines with iron found in the rocks to form
\n(a) iron carbonate
\n(b) iron nitrites
\n(c) iron oxides
\n(d) iron sulphate
\nAnswer:
\n(c) iron oxides.<\/p>\n

(iv) During photosynthesis, carbon dioxide combines with water in the presence of sunlight to form
\n(a) protein
\n(b) amino acids
\n(c) carbohydrates
\n(d) vitamins
\nAnswer:
\n(c) carbohydrates.<\/p>\n

Question 2.
\nAnswer the following questions in about 30 words each :
\n(i) What do you understand by the term \u2018ecology\u2019?
\nAnswer:
\nEcology is the study of the earth as a \u2018household\u2019 of plants, animals and micro-organisms. They all live together as interdependent components.<\/p>\n

(ii) What is an ecological system? Identify the major types of ecosystems in the world.
\nAnswer:
\nThe interactions of a particular group of organisms with land, air and water (abiotic factors) within a particular habitat or habitats, resulting in clearly defined energy flows and material cycles on land, water, and air, are called ecological systems.<\/p>\n

\"NCERT<\/p>\n

Ecosystems are of two major types – terrestrial and aquatic. Terrestrial ecosystem is further classified into biornes. The major biomes of the world are – forest, grassland, desert and tundra biornes.<\/p>\n

Aquatic ecosytem can be classified as marine and freshwater ecosystems. Marine ecosystem includes oceans, coastal estuaries and coral reefs. Freshwater ecosystem includes lakes, ponds, streams, marshes and bogs.<\/p>\n

(iii) What is a food chain? Give one example of a grazing food- chain identifying the various levels.
\nAnswer:
\nThe food relation representing a producer, a primary consumer, a secondary consumer and a decomposer is called a food chain. The four trophic levels of a food chain are the producers, the herbivores or the primary or first order consumers (e,g. cattle, deer and goat), the carnivores or the secondary or second order consumers (e.g. lion) and the decomposers (e.g bacteria).
\n\"NCERT<\/p>\n

(iv) What do you understand by the term \u2018food web\u2019? Give examples.
\nAnswer:
\nMany simple food chains intermingle with each other to form a food web. For example, each organism may eat a variety of food derived from another organism and, in turn, may be eaten by’a number of organisms at a higher level of the food chain. The primary producers use the energy of the sun and provide it to consumers at higher level. But energy is lost during each upward step in the food chain.<\/p>\n

(e) What is a biome?
\nAnswer:
\nThe largest natural regions which occur in distinct group \u201e communities, in areas having similar climatic conditions, are known as biomes.<\/p>\n

The major biomes of the world are :<\/p>\n