Ecosystem: Interdependence in Nature - 1 Class 6 Worksheet Science

Q1: Multiple Choice Questions (MCQs).

(i) Which of the following is a biotic component of an ecosystem?
(a) Water
(b) Air
(c) Plants
(d) Soil
Ans: (c)
Plants are a biotic component of an ecosystem as they are living organisms that make up a part of the ecosystem.

(ii) What do we call the process by which plants produce their food?
(a) Respiration
(b) Photosynthesis
(c) Decomposition
(d) Transpiration
Ans: (b)
Photosynthesis is the process by which plants produce their food using sunlight, water, and carbon dioxide.

(iii) Which of the following is an example of a decomposer in an ecosystem?
(a) Deer
(b) Lion
(c) Bacteria
(d) Grass
Ans: (c)
Bacteria are decomposers in an ecosystem as they help break down dead plants and animals, returning nutrients to the soil.

(iv) What is the main source of energy in an ecosystem?
(a) Wind
(b) Sun
(c) Water
(d) Soil
Ans: (b)
The sun is the main source of energy in an ecosystem, as it provides the energy needed for plants to carry out photosynthesis.

(v) What do we call the organisms that eat plants for their food?
(a) Carnivores
(b) Herbivores
(c) Omnivores
(d) Decomposers
Ans: (b)
Herbivores are organisms that eat plants for their food, such as deer, rabbits, and cows.

Q2: Fill in the Blanks.

(i) The __________ refers to all the living organisms and non-living components in a specific area.
Ans: ecosystem
An ecosystem includes all the plants, animals, and microorganisms in an area, along with the non-living factors like soil, water, and air.

(ii) __________ is the process by which green plants make their food using sunlight, carbon dioxide, and water.
Ans: Photosynthesis
During photosynthesis, plants use sunlight energy to convert carbon dioxide and water into glucose and oxygen.

(iii) The role of an organism in an ecosystem, including its relationships with other organisms, is called its __________.
Ans: ecological niche
An ecological niche refers to an organism's specific role and position in its environment, including its interactions with other organisms.

(iv) The place where an organism lives and finds its food is called its __________.
Ans: habitat
A habitat provides the necessary resources and conditions for an organism to survive, such as food, water, shelter, and suitable living conditions.

(v) Decomposers play a vital role in the ecosystem by __________.
Ans: breaking down dead organisms and organic matter
Decomposers, like fungi and bacteria, break down dead plants, animals, and other organic materials, releasing nutrients back into the ecosystem.

Q3: True or False.

(i) All living organisms depend on each other for their survival in an ecosystem.
(ii) Photosynthesis is the process by which animals produce their own food.
(iii) Decomposers help in recycling nutrients by breaking down dead organisms.
(iv) All herbivores are primary consumers in a food chain.
(v) Ecosystems remain constant and do not change over time.
Ans:
(i)True: In an ecosystem, different organisms are interconnected, and their survival depends on the availability and interactions of other organisms.
(ii) False: Photosynthesis is a process specific to plants, where they produce their food using sunlight energy, carbon dioxide, and water.
(iii) True: Decomposers play a crucial role in the ecosystem by breaking down dead organisms and returning nutrients to the soil, which can be used by plants again.
(iv) True: Herbivores are animals that eat only plants, and they occupy the position of primary consumers in a food chain.
(v) False: Ecosystems are dynamic and can change over time due to natural processes or human activities.