Case Study MCQ Questions Chapter 15 Our Environment Class 10 Science

Please see below Case Study MCQ Questions Chapter 15 Our Environment Class 10 Science. These MCQ Questions with Answers for Case study have been designed as per the latest syllabus and examination guidelines of Class 10 Science. Cased Study Based MCQ Questions for Class 10 Science are expected to come in the upcoming exams. We have provided a lot of case studies for all chapters in standard 10 science. Please solve the MCQ Questions and compare with the answers provided by our teachers.

Chapter 15 Our Environment Class 10 Science Case Study MCQ Questions

Food chains are very important for the survival of most species. When only one element is removed from the food chain it can result in extinction of a species in some cases. The foundation of the food chain consists of primary producers. Primary producers, or autotrophs, can use either solar energy or chemical energy to create complex organic compounds, whereas species at higher trophic levels cannot and so must consume producers or other life that itself consumes producers. Because the sun’s light is necessary for photosynthesis, most life could not exist if the sun disappeared. Even so, it has recently been discovered that there are some forms of life, chemotrophs, that appear to gain all their metabolic energy from chemosythesis driven by hydrothermal vents, thus showing that some life may not require solar energy to thrive.

Question. Matter and energy are two fundamental inputs of an ecosystem. Movement of
(a) Energy is bidirectional and matter is repeatedly circulating.
(b) Energy is repeatedly circulation and matter is unidirectional.
(c) Energy is unidirectional and matter is repeatedly circulating.
(d) Energy is multidirectional and matter is bidirectional.

Question. Which of the following limits the number of trophic levels in a food chain?
(a) Decrease in energy at higher trophic levels
(b) Less availability of food
(c) Polluted air
(d) Water

Question. If Ravi is consuming curd/yogurt for lunch, which trophic level in a food chain he should be considered as occupying ?
(a) First trophic level
(b) Second trophic level
(c) Third trophic level
(d) Fourth trophic level

Question. The decomposers are not included in the food chain.The correct reason for the same is because decomposers:
(a) Act at every trophic level of the food chain
(b) Do not breakdown organic compounds
(c) Convert organic material to inorganic forms
(d) Release enzymes outside their body to convert organic material to inorganic forms

Question. If 10,000 J solar energy falls on green plants in a terrestrial ecosystem, what percentage of solar energy will be converted into food energy?
(a) 10,000 J
(b) 100 J
(c) 1000 J
(d) It will depend on the type of the terrestrial plant.

The diagram below shows a food web from the sea shore

Question. In the food web, what two organisms are competing for food?

(a) A and B
(c) A and C
(b) D and F
(d) B and D

Question. Consider the following statements concerning food chains:
(i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation
(ii) Removal of most of the carnivores resulted in an increased population of herbivores.
(iii) The length of the food chains is generally limited to 3 – 4 trophic levels due to energy loss
(iv) The length of the food chains may vary from 2 to 8 trophic levels
Which two of the above statements are correct?
(a) (i), (iv)
(b) (i), (ii)
(c) (ii), (iii)
(d) (iii), (iv)

Question. Why do all food chains start with plants?
(a) Because plants are easily grown
(b) Because plants are nutritious
(c) Because plants can produce its own energy
(d) Because plants do not require energy

Question. Which of the following group of organisms are not included in ecological food chain?
(a) Carnivores
(b) Saprophytes
(c) Herbivores
(d) Predators

Question. The mussel can be described as
(a) Producer
(b) Primary consumer
(c) Secondary consumer
(d) decomposer

Question. Which trophic level is incorrectly defined?
(a) Carnivores – secondary or tertiary consumers
(b) Decomposers – microbial heterotrophs
(c) Herbivores – primary consumers
(d) Omnivores – molds, yeast and mushrooms

Waste management is essential in today’s society. Due to an increase in population, the generation of waste is getting doubled day-byday. Moreover, the increase in waste is affecting the lives of many people. Waste management is the managing of waste by disposal and recycling of it. Moreover, waste management needs proper techniques keeping in mind the environmental situations. For instance, there are various methods and techniques by which the waste is disposed of. You must have come across 5 R’s to save the environment: refuse, reduce, reuse, repurpose and recycle.

Question. According to the ‘Solid Waste Management Rule 2016’, the waste should be segregated into three categories. Observe the table below and select the row that has correct information:  

Wet waste	Dry waste	Hazardous waste
(a) Cooked food, vegetable peels	Used bulbs, fluorescent lamps	Plastic carry bags, bottles, newspaper, cardboard
(b) Coffee and tea powder, garden waste	Plastic carry bags, bottles, newspaper, cardboard	Expired medicines, razors, paint cans
(c) Leftover food, vegetable peels	Coffee and tea powder, garden waste	Insect repellents, cleaning solutions
(d) Uncooked food, tea leaves	Old crockery, frying pans	Coffee and tea powder, garden waste

Question. Recycling of paper is a good practice but recycled paper should not be used as food packaging because: 
(a) recycled papers take lots of space.
(b) recycled papers can’t cover food properly.
(c) recycled papers can cause infection.
(d) recycled papers are costly.

Question. The given graph shows the amount of waste generated, dumped and treated in percentage. 

Identify the Reason of low success rate of waste management process.
(a) only 15% of urban India’s waste is processed.
(b) less than 60% of waste is collected from households.
(c) more than 60% of waste is collected from households.
(d) both (a) and (b).

Question. Choose the waste management strategy that is matched with correct example:    

(a) Refuse	Choose products that use less packaging.
(b) Reduce	Give unwanted toys and books to hospitals or schools.
(c) Reuse	Not using single use plastic.
(d) Repurpose	Making flower pot from used plastic bottle.

Question. Effective segregation of wastes at the point of generation is very important. Select the appropriate statements giving the importance of waste segregation. 
I. less waste goes to the landfills.
II. better for public health and the environment.
III. help in reducing the waste.
IV. resulting in deterioration of a waste picker’s health.
(a) both I and II
(b) both I and III
(c) both II and III
(b) both I and IV

Observe the food web given below and answer any four questions from 

Question. Why do all food chains start with plants?   
(a) Because plants are easily grown.
(b) Because plants are nutritious.
(c) Because plants can produce its own energy.
(d) Because plants do not require energy.

Question. In the following food web, what two organisms are competing for food?

(a) A and B
(b) A and C
(c) D and F
(d) B and D

Question. The mussel can be described as   
(a) Producer
(b) Primary consumer
(c) Secondary consumer
(d) decomposer

Question. Which trophic level is incorrectly defined?   
(a) Carnivores : Secondary or tertiary consumers
(b) Decomposers : Microbial heterotrophs
(c) Herbivores : Primary consumers
(d) Omnivores : Molds, Yeast and Mushrooms

Various components of an ecosystem maintain a balance in nature. Disturbance in any component of the environment cause an imbalance. One of the main environment problem caused by human activities is global warming. Global warming is a phenomenon caused by the increasing concentration of greenhouse gases in the atmosphere resulting due to enhanced greenhouse effect.

Question. Study carefully the following figure representing greenhouse effect and Select the correct statement regarding this.

(a) Much of the long wavelength infrared radiations re-radiated by the earth’s surface are absorbed are by the atmospheric greenhouse gases.
(b) CO₂, CH₄, CFCs and N₂O are the gases which are responsible for greenhouse effect.
(c) The atmosphere is transparent to the incoming short-wavelength radiations and is translucent to the long-wavelength infrared radiations.
(d) All of these

Question. Greenhouse effect is due to ___________. 
(a) accumulation of O₃ and depletion of CO₂.
(b) accumulation of both O₃ and CO₂.
(c) accumulation of CO₂ and depletion of O₃.
(d) presence of green plant on the earth.

Question. Refer to the given pie chart showing the contribution of different gases to global warming. Identify gases P, Q R and S. Select the incorrect statement regarding.

(a) P could be a gas that increases in atmosphere due to excessive use of fossil fuel.
(b) Q could be a gas produced by complete combustion of biomass.
(c) R could be synthetic gaseous compounds used as refrigerants in air conditioners and refrigerators.
(d) S could be a gas produced by combustion of nitrogen rich fuel.

Question. What could not be a source of gas Q given in the above pie chart? 
(a) Marshes
(b) Cattle
(c) Jet fuel
(d) Flooded paddy field

Question. If there is no CO₂ in the atmosphere, then what will be the most likely consequence of this on the temperature of earth? 
(a) The temperature remain unchanged as it depends upon the oxygen content of the atmosphere.
(b) The temperature would increase as less greenhouse gases will be absorbed by CO₂.
(c) The temperature would decrease CO₂ is the principal greenhouse gas.
(d) None of these.

Some harmful non-biodegradable chemicals i.e., pesticides (e.g. DDT) and heavy metals (e.g., mercury, arsenic cadmium, etc.) enter the bodies of organism through the food chain and go on concentrating at each trophic level. This phenomenon is called bio-magnification or biological magnification.

Question. Refer to the given table.

Organism	Amount of cadmium
A	0.5 ppm
B	25 ppm
C	0.003 ppm
D	2 ppm
E	0.04 ppm

According to the given data. The correct order in a food chain will be
(a) E → C → D → A → B
(b) B → D → A → E → C
(c) C → E → A → D → B
(d) C → E → A → B → D

Question. A group of scientist analysed samples of five different animals from a river for possible accumulation of DDT in their body due to bio-magnification. The result obtained is shown in the given graph. 

The correct order of the food chain operating in a river is
(a) S → P → Q → R
(b) S → Q → R → P
(c) P → R → Q → S
(d) P → Q → S → R

Question. When animals are sprayed with poisons, they may die immediately, but their bodies still contain the poison. The poison in their bodies will then be passed on to the animals which eat them. What would be the consequence of a mass poisoning of the rabbit population in a grazing food chain and why? 
(a) Plants would die quickly as they are eaten by rabbits.
(b) Grasshopper would die quickly as all animals in the food web would be affected.
(c) Western rattlesnakes would quickly become poisoned as they eat rabbits.
(d) Hawk would become poisoned as they feed on rabbits.

Question. Refer to the food chain given below. Phytoplankton → Zooplankton → Small fish → Large fish → Fish eating birds If concentration of DDT in small fish estimated to be 0.5 ppm, then amount of DDT in Zooplankton and Large fish would respectively be 
(a) 0.04 ppm, 2ppm
(b) 2 ppm, 0.04 ppm
(c) 0.04 ppm, 0.04 ppm
(d) 2 ppm, 0.5 ppm

Question. Higher amount of DDT disturb calcium metabolism of bird. This results in.   
(a) thickening of their egg shells.
(b) premature breaking of eggs.
(c) death of their embryos.
(d) both (b) and (c).

Biosphere is a global ecosystem composed of living organisms and abiotic factors from which they derive energy and nutrients. And ecosystem is defined as structural and functional unit of the biosphere comprising of living and non-living environment that interact by means of food chains and chemical cycles resulting in energy flow, biotic diversity and material cycling to form a stable, self-supporting system

Question. The mussel can be described as
(a) Producer
(b) Primary consumer
(c) Secondary consumer
(d) decomposer

Question. The given figure best represents:

(a) Grassland food chain
(b) Parasitic food chain
(c) Forest food chain
(d) Aquatic food chain

Question. Which trophic level is incorrectly defined?
(a) Carnivores – secondary or tertiary consumers
(b) Decomposers – microbial heterotrophs
(c) Herbivores – primary consumers
(d) Omnivores – molds, yeast and mushrooms
The diagram below shows a food web from the sea shore