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Worksheets10 class 8 unit
Total questions: 20
Worksheet time: 41mins
Which of the following is an example of conservation?
Rotating which crops grow in a field each year so the soil does not loose its nutrients.
Cutting down only specific types of trees and then planting new ones in their place.
Riding your bike to school.
Only keeping fish of a certain size and throwing small fish back so they can reproduce.
What are two causes for desertification?
drought and development
drought and overgrazing from livestock
mining and fishing
mining and overgrazing from livestock
A fuel, such as coal, oil, or natural gas, formed in the geological past from the decayed remains of ancient organisms, such as plants and animals?
reduce
conservation
renewable resources
fossil fuels
Blood is an example of
epithelial tissue
connective tissue
muscle tissue
nervous tissue
Muscles are located in all the following EXCEPT
in the digestive tract
in the heart
attached to bones
inside bones
The neuron is part of the
nervous tissue
connective tissue
epithelial tissue
muscular tissue
Which is not a type of WBC?
Neutrophill
Monocyte
Lymphocyte
Macrophage
Carbohydrates in the plants are stored in the form of
Glycogen
Starch
Glucose
Maltose
Proteins after digestion are converted into
Carbohydrates
Small globules
Amino acids
starch
The chlorophyll in photosynthesis is used for
Absorbing light
Breaking down water molecule
No function
Reduction of CO2
There is ______ of energy as we go from one trophic level to the next
a gain
an increase
a loss
no change
Human-made materials like ____ will not be broken down by the action of bacteria or other saprophytes.
Vitamins
Fats
Carbohydrates
Plastics
Which of the two belong to the same trophic level?
Frog
Monkey
Eagle
Lizard
What will happen if deer is missing in the food chain given above? Choose 2 correct options:
The population of tiger decreases
population of grass increases
The population of tiger increases
The population of grass decreases
Improvements in our life-style have resulted in greater amounts of:
energy generation
carbon dioxide generation
oxygen generation
waste material generation
As human beings occupy the top level in any food chain, the maximum concentration of these chemicals get accumulated in our bodies. This phenomenon is known as
Biological magnification
Biological accumulation
Chemical magnification
Chemical accumulation
Every food chain in the ecosystem begins with____which are the original source of food.
Saprophytes
Producers
Parasytes
Consumers
