Question 11 Mark
In which unit is amount of atmospheric ozone expressed?
Answer
View full question & answer→- Dobson Unit $(DU)$
Questions
[1 Mark Questions]
🎯
Test yourself on this topic
39 questions · timed · auto-graded
Question 21 Mark
Smallest energy transfer : secondary consumers to tertiary consumers ::
largest energy transfer : ....
largest energy transfer : ....
Answer
View full question & answer→- producers level
Question 31 Mark
A food chain comprising hawk, snake, paddy and mice. If $15,000 \ J$ of energy available to mice then how much energy will be in paddy and how much energy will be available to hawk.
Answer
View full question & answer→- $15,000 \ J$ of energy will be in paddy and $150 \ J$ of energy will be available to hawk.
Question 41 Mark
Among the following, which have posed a threat to the environment?
Body spray, bacteria, aerosols, $CFCs$, wild grass
Body spray, bacteria, aerosols, $CFCs$, wild grass
Answer
View full question & answer→- Body spray, aerosols, $CFCs$
Question 51 Mark
Give the full form of : $CFCs, UNEP$
Answer
View full question & answer→- $CFCs $- Chloroflurocarbons
- $UNEP$ - United Nations Environment Programme
Question 61 Mark
When a population of animal $‘X’$ is introduced into the biotic community of an ecosystem, the number of lions increased while the number of deer decreased. Which is correct option for animal $‘X’?$
Answer
View full question & answer→- $X$ animal is a predator of deer and a prey of lion.
Question 71 Mark
Who am I?
I am a product of oxygen under the influence of $UV$ radiation and I absorb $UV$ rays.
I am a product of oxygen under the influence of $UV$ radiation and I absorb $UV$ rays.
Answer
View full question & answer→- Ozone $(O_3)$
Question 81 Mark
Use of disposable plastic plates should be prevented because .... (Complete the sentence.)
Answer
View full question & answer→- It is made-up of non-biodegradable substance.
Question 91 Mark
Define the terms : Artificial ecosystem
Answer
View full question & answer→- An ecosystem which is created and maintained by humans is called artificial ecosystem.
Question 101 Mark
Define the terms : Food web
Answer
View full question & answer→- The network of overlapping food chains operating in an ecosystem is called a food web.
Question 111 Mark
Define the terms : Consumers
Answer
View full question & answer→- Those organisms which are dependent on producers for their nutritional requirement are called consumers.
Question 121 Mark
Define the terms : Producers
Answer
View full question & answer→- All green plants and certain bacteria which can produce food by the process of photosynthesis are called producers.
Question 131 Mark
Define the terms : Non-biodegradable substances
Answer
View full question & answer→- The substances that cannot be converted into harmless simpler forms by the action of microorganisms are called non-biodegradable substances.
Question 141 Mark
Define the terms : Biodegradable substances
Answer
View full question & answer→- The substances which can be disposed off naturally by the action of micro-organisms/ decomposers are called biodegradable substances.
Question 151 Mark
Define the terms : Biological magnification
Answer
View full question & answer→- A phenomenon of progressive increase in the concentration of non-biodegradable substances in organisms at each successive trophic level is known as biological magnification.
Question 161 Mark
Define the terms : Decomposers
Answer
View full question & answer→- The microorganisms that breakdown the complex organic substances into simple inorganic substances are known as decomposers.
Question 171 Mark
Define the terms : Ecosystem
Answer
View full question & answer→- A system formed by an interaction between biotic components and the physical environment is called an ecosystem.
Question 181 Mark
Why is straight-line food chain is not common in the natural ecosystem?
Answer
View full question & answer→- In the natural ecosystem each organism is generally eat two or more other kinds of organisms which is in turn are eaten by several other organisms. So, straight-line food chain is not common in the natural ecosystem.
Question 191 Mark
Which chemical is used in fire extinguishers? How it is harmful?
Answer
View full question & answer→- $CFCs$ (chlorofluorocarbons) is used in fire extinguishers.
- It is harmful as it leads to depletion of ozone layer.
Question 201 Mark
List two methods of safe disposal of the non-biodegradable waste.
Answer
View full question & answer→- $(1)$ By recycling $(2)$ By underground dumping
Question 211 Mark
Mention the amount of solar energy captured by the green plants out of the total energy that reaches on the earth from the sun and mention the percentage of energy, which is transferred from one trophic level to next higher one.
Answer
View full question & answer→- The green plants in a terrestrial ecosystem capture about $1 \%$ of the energy of sunlight falling on their leaves.
- An average $10 \%$ energy is transferred from one trophic level to the next higher one.
Question 221 Mark
Among grass, deer, lion by whom maximum energy is transported to its upper trophic level?
Answer
View full question & answer→- Grass
Question 231 Mark
Among snake, insects, frog, plants, hawk which one is an organism of fourth trophic level?
Answer
View full question & answer→- Snake
Question 241 Mark
Why all food chains begin with organisms that contain chlorophyll?
Answer
View full question & answer→- Chlorophyll containing organisms are able to capture solar energy and covert this into chemical energy. Because of it energy flow is continued in an ecosystem.
Question 251 Mark
In a given food web,
$(1)$ Identify which one is secondary as well as tertiary consumers.
$(2)$ Identify which one has minimum conc. of pesticides.
$(1)$ Identify which one is secondary as well as tertiary consumers.
$(2)$ Identify which one has minimum conc. of pesticides.
Answer
View full question & answer→- $(1)$ Hawk $(2)$ Producers, i.e., food grains, Small plants, grass.
Question 261 Mark
In the chart of energy flow given below identify the decomposers and explain your choice:
Answer
View full question & answer→- In the chart $B$ indicates decomposers. They decompose dead materials available from $A, C$ and $D.$
Question 271 Mark
Define the terms : Food chain
Answer
View full question & answer→- Living organisms of an ecosystem depend on each other for their food requirement and form a chain turmed as food chain.
Question 281 Mark
Why are autotrophs called producers and heterotrophs called consumers?
Answer
View full question & answer→- Autotrophs are green plants which perform photosynthesis and produce organic compounds (carbohydrates). So, they are called producers.
- Heterotrophs consume food from other organisms. So they are called consumers.
Question 291 Mark
Name the natural cleansing agent in an ecosystem.
Answer
View full question & answer→- Decomposers (e.g., bacteria, fungi) and Scavengers (e.g., kite, crow).
Question 301 Mark
Name two natural and two artificial ecosystems.
Question 311 Mark
What is the function of ozone in the upper atmosphere?
Answer
View full question & answer→- Ozone shields the surface of the earth from harmful ultraviolet radiation from the sun.
Question 321 Mark
Construct food chain from following organisms:
$(a)$ Frog, insects, birds, grass.
$(b)$ Fish, algae, small animals, large fish
$(a)$ Frog, insects, birds, grass.
$(b)$ Fish, algae, small animals, large fish
Answer
View full question & answer→- $(a)$ Grass → Insects → frog → birds
- $(b)$ Algae → small animals → fish → large fish
Question 331 Mark
Can any single organism occupy two different trophic levels? Yes or no. Explain.
Answer
View full question & answer→- Yes. Rat occupies herbivores trophic level as primary consumer and also occupies carnivores trophic level as secondary consumer.
Question 341 Mark
Which trophic level has maximum and which trophic level has minimum number of organisms?
Answer
View full question & answer→- In a food chain, maximum number of organisms are at first trophic level (at producers level) and minimum number of organisms are at fourth trophic level (higher carnivores).
Question 351 Mark
How many trophic levels occur in food chain?
Answer
View full question & answer→- There are three or four trophic levels in a food chain.
Question 361 Mark
What are various orders of food chain named as?
Answer
View full question & answer→- Various levels of food chain are named as trophic levels.
Question 371 Mark
What happens to the dead plants and dead animals?
Answer
View full question & answer→- Decomposers decompose complex organic matter into inorganic constituents that are present in dead plants and dead animals.
Question 381 Mark
Which is main functional unit of an environment?
Answer
View full question & answer→- Ecosystem is main functional unit of an environment.
Question 391 Mark
Who affects the environment the most?
Answer
View full question & answer→- Human activities affect the environment most.