Question

Answer the following questions :-

Class 9
Chapter 7 : Ecosystem

[ no Spam ]

1] What are omnivorses ? give one example .

2] what is mean by the term 'environment ' ?

3] write a note on Minamata disease.

4] Describe ecological niche .

4] State the importance of vultures and kites in biotic environment.

5] Decomposers are not included in any food chain . why ?

6] Is it right to eradicate in living organism in an ecosystem ? How is it harmful ?

7] what are the two main components of our environment ? Give examples .

8] Name some natural and artificial ecosystems.

9] How much energy is utilised at each trophic level ? Explain.

10] Organisms which synthesise carbohydrates by using radiant energy are called :

A) decomposers
B) producers
C) herbivores
D) carnivores


[ Note : - No copy paste answers ] ​

Answer 1

1. Omnivores are a diverse group of animals. Examples of omnivores include bears, birds, dogs, raccoons, foxes, certain insects, and even humans. Animals that hunt other animals are known as predators, while those that are hunted are known as prey.
2. 1 : the circumstances, objects, or conditions by which one is surrounded. 2a : the complex of physical, chemical, and biotic factors (such as climate, soil, and living things) that act upon an organism or an ecological community and ultimately determine its form and survival
3. Minamata disease, sometimes referred to as Chisso-Minamata disease, is a neurological syndrome caused by severe mercury poisoning. Symptoms include ataxia, numbness in the hands and feet, general muscle weakness, narrowing of the field of vision and damage to hearing and speech.
4. Important constituent of biotic environment includes Kites and vultures as they feed on dead organisms and act as scavengers (cleansing agents) of the environment.
5. As the decomposers (bacteria and fungi) decomposes every organism at each trophic level. ... So, it is impossible to place the decomposers at the specific trophic level because they are related with each trophic level. That's why decomposers are not considered in the food chain.
6. no it's not right.Ecology is the study of how organisms interact with one another and with their physical environment. The distribution and abundance of organisms on Earth is shaped by both biotic, living-organism-related, and abiotic, nonliving or physical, factors.
7. The 'two main components' of the environment are the 'biotic factors' and the 'abiotic factors'. The biotic factors are the forms of life that occupies the environment whereas the abiotic features are the various factors that are present in the environment.
8. Deserts, forests, and oceans are a few examples of naturally occurring ecosystems. Examples of artificial ecosystems are-Aquariums, crop fields, dams, gardens, zoo, park, etc.
9. The amount of energy at each trophic level decreases as it moves through an ecosystem. As little as 10 percent of the energy at any trophic level is transferred to the next level; the rest is lost largely through metabolic processes as heat
10. Solution. Green plants are producers that prepare carbohydrates as food from inorganic compounds, such as carbon dioxide and water, by using sunlight as the radiant energy.

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Answer 2

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1] The animals which eat both plant food as well as meat of animals are called Omnivores , e.g. man , dog etc.

2] The physical and biological world around us where we live is called environment.

3]

• i) Mercury that was released from Vinyl Chloride factory in Japan used to reach the bBay of Minamata.

• ii) It entered bodies of fish , crab and molluscs of that region .

• iii) The people who consumed these animals as food developed a disease which was named as Minamata disease in 1956.

• iv) It causes initial number of limbs , lips and tongue .

• v) Finally , it lead to impairment of motor control , defence , blurring of vision , cellular degeneration in the brain , coma and death

4]

• i) The specific position of an organism in the food web is called ' niche '.

• ii) Niche not only denotes the animal's position in the food web and what it eats , but also its mode of life.

• iii) A niche describes an organism's occupation , the weight goes about its business and earns its living .

5]

• i) Vultures and kites are top carnivores and decaying feed on dead organisms.

• ii) By doing so, the act as natural scavengers of the earth and help it cleaning the environment by eating the dead and decaying organisms.

6] Decomposers act on the organisms of all tropical levels of a food chain. Hence ,they are not included in food chains .

Eg : Fungi and bacteria

7]

• No , it is not right to eradicate a living organism in an ecosystem .

• If we eradicate a living organism in an ecosystem , it affects the food chain and food webs in an ecosystem.

• It leads to imbalance in the ecosystem.

8]

1. Biotic components. Eg. plants , animals , etc.
2. Abiotic components . Eg. soil , air , water , etc.

9]

1. Natural ecosystems : Forests , ponds , lakes , etc.
2. Artificial ecosystems ( man made ecosystem ) :- Gardens , crop fields , etc.

10]

i) Whe Green plants are eaten by primary consumers , a great deal of energy is lost as heat to the environment.

ii) Some amount of this energy goes for digestion and doing work , while the rest of energy goes towards growth and reproduction at each trophic level.

III) An average of 10% of the food eaten is returned to the body weight of an organism ( at the trophic level) and made available for the next level of consumers.

11] Organisms which synthesise carbohydrates by using radiant energy are called Producers.

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