How Nature Works in Harmony Class 8 MCQ
hardHow Nature Works in Harmony Class 8 MCQ
How Nature Works in Harmony Class 8 MCQ
Question 1.
What is the primary role of producers in an ecosystem?
(a) To consume other organisms
(b) To produce their own food through photosynthesis
(c) To decompose organic matter
(d) To provide shelter for animals
Answer:
(b) To produce their own food through photosynthesis
Question 2.
Which of the following organisms is considered a herbivore?
(a) Fox
(b) Eagle
(c) Deer
(d) Vulture
Answer:
(c) Deer
Question 3.
What is a food chain?
(a) A complex network of feeding relationships
(b) A linear sequence showing who eats whom in an ecosystem
(c) A diagram showing the energy flow in an ecosystem
(d) A list of all organisms in a habitat
Answer:
(b) A linear sequence showing who eats whom in an ecosystem
Question 4.
Which farming practice is considered unsustainable?
(a) Crop rotation
(b) Use of synthetic fertilisers and pesticides
(c) Organic farming
(d) Permaculture
Answer:
(b) Use of synthetic fertilisers and pesticides
Question 5.
What is the role of decomposers in an ecosystem?
(a) To produce energy
(b) To consume plants
(c) To break down dead organic matter
(d) To compete with producers
Answer:
(c) To break down dead organic matter
Question 6.
In a grassland ecosystem, which organism is at the top of the food chain?
(a) Grass
(b) Hare
(c) Fox
(d) Eagle
Answer:
(d) Eagle
Question 7.
What is a human-made ecosystem?
(a) A natural forest
(b) A fish pond or farm
(c) A desert
(d) A mountain rang
Answer:
(b) A fish pond or farm
Case Study
I. The Impact of Fish on Pond Ecosystems
In a study comparing two ponds, one with fish and another without, researchers observed significant differences in insect populations. The presence of fish reduced dragonfly larvae, leading to an increase in pollinators like bees and butterflies. This case illustrates the intricate connections within ecosystems, where biotic components like fish influence the health of plant life through indirect interactions.
Question 1.
What was observed in Pond A, which contained fish, compared to Pond B, which did not have fish?
(a) More dragonflies were present in Pond A.
(b) There were fewer pollinators like bees and butterflies in Pond A.
(c) Fish reduced the number of dragonfly larvae in Pond A.
(d) The number of flowering plants was higher in Pond A.
Answer:
(c) Fish reduced the number of dragonfly larvae in Pond A.
Question 2.
How do pollinators like bees and butterflies benefit from the absence of fish in a pond ecosystem?
(a) They have more food sources available due to fewer dragonflies.
(b) They can reproduce more quickly without competition.
(c) They help in pollinating flowers, leading to increased seed production.
(d) They thrive in environments with high fish populations.
Answer:
(c) They help in pollinating flowers, leading to increased seed production.
Question 3.
In ecosystems, the presence of fish can lead to a decrease in ............ larvae, which in turn allows for an increase in the population of pollinators like bees and butterflies.
Answer:
dragonfly
Question 4.
The interactions between biotic components, such as fish and insects, and abiotic components, such as water and sunlight, are crucial for maintaining ............ in an ecosystem.
Answer:
balance
Question 5.
The presence of fish in a pond ecosystem has a direct positive effect on the number of flowering plants nearby by increasing the number of dragonflies. (True/False)
Answer:
False
II. Urbanisation and Habitat Loss
As cities expand, natural habitats are often destroyed, leading to a decline in biodiversity. In regions where forests are cleared for construction, wildlife is forced into urban areas, resulting in conflicts. This case highlights the urgent need for sustainable urban planning that considers both human development and the preservation of ecosystems, ensuring a harmonious coexistence.
Question 1.
What is one major consequence of urbanisation on wildlife habitats?
(a) Increased biodiversity
(b) Improved ecosystem health
(c) Habitat loss and wildlife displacement
(d) Enhanced food production
Answer:
(c) Habitat loss and wildlife displacement
Question 2.
Which of the following practices can help mitigate the negative effects of urbanisation on ecosystems?
(a) Expanding cities without planning
(b) Creating wildlife corridors
(c) Increasing deforestation
(d) Ignoring local biodiversity
Answer:
(b) Creating wildlife corridors
Question 3.
As cities expand, natural habitats are often destroyed, leading to a decline in .............
Answer:
biodiversity
Question 4.
Wildlife corridors are essential for allowing animals to travel safely between ............areas without coming into conflict with human settlements.
Answer:
forest
Question 5.
Urbanisation has no impact on the natural habitats of wildlife. (True/False)
Answer:
False