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51.

What are Decomposers?

Answer»

Decomposers feed on the wastes of plants and animals after they die. They retain nutrients to the soil for the plants to use as the cycle begin again.

52.

The area occupied by desert on the land of A) 17% B) 18%C) 19% D) 20%

Answer»

Answer is (A) 17%

53.

The desert animals have A) Only morphological adaptations B) Only physiological adaptationsC) They don’t have any adaptations D) Both morphological and physiological adaptations

Answer»

D) Both morphological and physiological adaptations

54.

What are the different terms used for environment?

Answer»

The different terms are habitat, biome, ecological systems.

55.

The food web starts fromA) Animals B) Plants C) Bacteria D) Fungi

Answer»

Answer is (B) Plants

56.

How much place is occupied by the desert on land?

Answer»

The desert occupy about 11% of the land and occur in the regions with an average rainfall of less than 23 mm per year.

57.

What do we call the small level of ecosystem?

Answer»

The small level of ecosystem is called habitat.

58.

What do we study in an ecosystem?

Answer»

In ecosystem we study about the changes occuring in the habitat like organisms moving away from the habitat or entering the habitat.

59.

What are Mangroves?

Answer»

Mangroves are one of the most productive ecosystems on earth, deriving nourishment from terrestrial fresh water and tidal saltwater.

60.

Match the following:  Group-A  Group-Bi. Treesa) Desertii. Camelb) Carrotiii. Fungic) Forestiv. Rabbitd) Rodents.v. Froge) Decomposersf) insectsg) ProtozoansA) i – b, ii – c, iii – d, iv – a, v – f B) i – a, ii – b, iii – c, iv – d, v – f C) i – c, ii – d, iii – a, iv – b, v – f D) i – c, ii – a, iii – e, iv – b, v – f

Answer»

D) i – c, ii – a, iii – e, iv – b, v – f

61.

What are the first trophic level in the ecosystem?

Answer»

Plants are the producers and represent the first trophic level in the ecosystem.

62.

What is ecosystem?

Answer»

The living community together with the physical environment forms an interacting system called the ecosystem.

63.

What do we call the larger level of ecosystem?

Answer»

The larger level of ecosystem is called Biome.

64.

All the energy present at a particular level in the food chains of an ecosystem is called A) Food web B) Ecotone C) Trophic level D) Food chain

Answer»

C) Trophic level

65.

On which factor the existence of the living world depends ?

Answer»

The existence of the living world depends upon the flow of energy and the circulation of materials through the ecosystem.

66.

Define an ecosystem. Explain it with a suitable example.

Answer»

1. An ecosystem can be defined as a functional unit of nature, where living organisms interact among themselves and also with the surrounding physical environment.

2. For example, Mangroves are one of the most productive ecosystem on earth, deriving nourishment from terrestrial fresh water and tidal salt water. 

3. Coringa mangrove is situated south of Kakinada Bay and is about 150 km south of Visakhapatnam. 

4. It is named after the river coringa. Coringa mangroves receives fresh water from coringa and Gaderu rivers and salt waters from Kakinada Bay. 

5. Biotic components in coringa: Producers: Mangrove, Spirogyra, Euglena, Oscilatoria, Blue Green Algae, Ulothrix etc. Consumers: Shrimp, crab, hydra, protozoans, mussel, snails, turtle, daphnia, brittle word, tube worm etc. 

Decomposers: 

Detritus feeding bacteria etc. 

6. Abiotic components: Salt and fresh water, air, sunlight, soil, etc.

67.

In what conditions a living community lives?

Answer»

A living community lives in an environment which supplies its materials and energy requirements and provides other living conditions.

68.

What happens when two animals having similar habits share one ecosystem?

Answer»

When two animals having similar habits, sharing one ecosystem , only the stronger and better equipped animal can survive, while the weaker one die or eliminated from the ecosystem. This is called ‘Survival of the fittest’.

69.

Explain how diversity of living organisms helps in enriching any ecosystem.

Answer»

1. The existence of the ecosystem depends on the continued survival of the organisms in the ecosystem.

2. All organisms require energy for growth, reproduction and survival. 

3. This energy is obtained by the organisms from the food they consume. 

4. Plants are the producers producing food in any ecosystem. The animals present in the ecosystem are consumers as they consume food from plants. 

5. Some of the organisms in the ecosystem such as bacteria and fungi, obtained their nutritional requirements by decomposing the dead bodies of both producers and consumers. 

6. They retain nutrients to the soil for the plants to use. As the cycle begins again.

7. Like this diversity of living organisms helps in enriching any ecosystem.

70.

Which of the following set of organisms are producers in an ecosystem? A) Shrimp, Spirogyra B) Mussel, DaphniaC) Oscillatoria, Ulothrix D) Euglena, Bacteria

Answer»

C) Oscillatoria, Ulothrix

71.

Living organisms that decompose dead animals and plants are called A) Producers B) Consumers C) Decomposers D) None

Answer»

(C) Decomposers

72.

All the organisms derive energy from A) soil B) water C) air D) food

Answer»

Answer is (D) food

73.

The dry skinned and spiny exoskeleton animals can be seen in A) Forest ecosystem B) Grassland ecosystem C) Desert ecosystemD) Pond ecosystem

Answer»

C) Desert ecosystem