Please refer to VBQs for Class 10 Science Our Environment. All value based questions for English Class 10 have been provided with solutions. We have provided below important values questions and answers. Students should learn these solved VBQs for Class 10 Science as these will help them to gain more marks and help improve understanding of important topics.
Our Environment VBQs Class 10 Science with Answers
Multiple Choice Questions
Question. Which of the following is the best way for disposal of vegetable and fruit peels?
Question. In the given Figure the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available?
Question. In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of :
(a) heat energy
(b) light energy
(c) chemical energy
(d) mechanical energy
Question. What will happen if Deer is missing in the food chain given below?
Grass → Deer → Tiger
(а) The population of tiger increases
(b) The population of grass decreases
(c) Tiger will start eating grass
(d) The population of tiger decreases and the population of grass increases
Question. Which of the statements is incorrect?
(а) All green plants and blue green algae are producers
(b) Green plants get their food from organic compounds
(c) Producers prepare their own food from inorganic compounds
(d) Plants convert solar energy into chemical energy
Question. Which of these is a greenhouse gas?
(a) Hydrogen Sulphide
(d) Carbon monoxide
Question. When is the World Environment Day celebrated?
(a) 16 June
(b) 5 December
(c) 5 June
(d) 5 July
Question. If a grasshopper is eaten by frog, then the energy transfer will be from:
(a) producers to decomposers
(b) producer to primary consumer
(c) primary consumer to secondary consumer
(d) secondary consumer to primary consumer
Question. The transfer of Energy in a food chain is always:
Question. Study the image given below and answer the following questions.
A. Which group of organisms may have higher Bio-magnification?
(b) Primary consumers
(c) Secondary Consumer
(d) Tertiary consumers
B. Which among the following are the Primary Producers?
(c) Algae and phytoplankton
(d) Green plants
C. The image given above is an example of
(a) Aquatic ecosystem
(a) Terrestrial ecosystem
(b) Land ecosystem
(c) Natural aquatic ecosystem
D. Which is the Primary source of energy in an ecosystem?
(d) Carbon dioxide
Assertion Reason Type Of Questions
(a) If both Assertion and reason are true and Reason is the correct explanation of assertion
(b) If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion
(c) If Assertion is true but the Reason is false
(d) If both Assertion and Reason are false
Question. Assertion: Polythene bags and plastic containers are non-biodegradable substances.
Reason: They can be broken down by microorganisms in natural simple harmless substances
Question. Assertion – The length and complexity of food chain vary greatly in an ecosystem
Reason – There is a reduction of energy when it transfers from one trophic level to other by eating and being eaten
Question. Assertion – Green plants harvest the solar energy directly and convert light energy into chemical energy
Reason – Food transfer in the ecosystem takes place through food chain and food web
Question. Assertion – Ozone is formed by three atoms of oxygen
Reason – UV rays are needed to form ozone molecule
Question. Assertion – There is generally greater number of individuals at the lower trophic levels of an ecosystem
Reason – Green plants are the producers in an ecosystem
Question. Assertion – More and more things we use becoming disposable, changes in packaging have resulted in much of our waste becoming Non-biodegradable
Reason – Biodegradable materials are environment friendly and easily degraded by the microbes in nature
Question. Assertion – Substances that are broken down by biological process are said to be Biodegradable
Reason- Some Pesticides and chemicals are Non- biodegradable
Very Short Answer Type Questions
Question. What is the ultimate source of energy in an ecosystem? Which process helps to trap this energy in producers?
Answer. Sun is the ultimate source of energy in an ecosystem. Photosynthesis helps to trap this energy in producers.
Question. What is the full form of CFCs and UNEP?
UNEP = United Nations Environment Programme
Question. What are the by-products of fertilizer industries? How do they affect the environment?
Answer. The harmful by-products of fertiliser industries are the harmful gases like sulphur dioxide and Nitrogen oxides. They cause air pollution and combine with the water vapour in the atmosphere to cause harmful acid rain
Question. Food web increases the stability of an ecosystem. Justify.
Answer. Food web shows food relationship in an ecological community. It consists of many food chains. Thus, if any one organism becomes endangered or extinct, the one dependent in it has an alternative option available to him for survival. In this way food web increases stability in the ecosystem.
Short Answer Type Questions
Question. Define trophic level in a food chain? The first trophic level in a food chain is always a green plant. Why?
Answer. Each step or level of the food chain forms a trophic level. The autotrophs or the producers are the first trophic level. They fix up the solar energy and make it available for the heterotrophs or consumers. The first tropic level in a food chain is always a green plant because only plants can utilize the radiant energy of the sun and transform it to chemical form during photosynthesis.
Question. List two environment friendly practices or habits which need to be followed by every member of a family or community. Explain how these practices will support the “save the environment” mission.
Answer. The below practices will support “Save the environment mission”
a. Use of paper bags or jute bags instead of plastic bags
b. Segregate biodegradable and non-biodegradable wastes in separate dustbins.
c. Use fuels like CNG, unleaded petrol or other ecofriendly fuels in vehicles.
Due to uses of environment friendly practices or habits we can save our environment
Question. Pesticides like DDT which are sprayed to kill pests on crops are found to be present in the soil, ground water, water bodies etc. Explain. How do they reach these places?
Answer. Soil: Pesticides are used to protect plants from insects. They consequently get settled into soil particles, when used on plants.
Groundwater: Through irrigation in the fields, these pesticides present in soil pass into lower layers of soil and reach ground water.
Question. Explain phenomenon of “biological magnification”. How does it affect organisms belonging to different trophic levels particularly the tertiary consumers?
Answer. The levels of harmful toxicants/pesticides like DDT get increased at successive trophic levels as they are neither metabolized nor excreted by the organism. They get accumulated in organism’s body with their higher concentrations at higher trophic levels. This is called as biological magnification Since, the tertiary consumers are at the top of the food chain, so a higher amount of these toxicants is present in them compared to the lower trophic levels.
Long answer Type Questions
Question. Explain some harmful effects of agricultural practices on the environment.
Answer. Harmful effects of agricultural practices on the environment are
a. Change in the chemistry of soil and killing of useful microbes due to excessive use of fertilizers.
b. Biological magnification occurs due to excessive use of chemical pesticides.
c. Water table gets lowered due to the excess use of ground water.
d. Soil fertility is lost due to extensive cropping.
e. The natural ecosystems are harmed due to ploughing during agriculture.
Question. Differentiate between biodegradable and non-biodegradable substances with the help of one example each. List two changes in habit that people must adapt to dispose non-biodegradable waste for saving the environment.
Answer. A. Biodegradable substances: Substances that can be slowly destroyed and broken down into very small parts by natural processes i.e., by bacteria, fungi, etc. For example, organic wastes like vegetables and fruit peels.
B. Non-biodegradable substances: Substances that cannot be broken down or decomposed into the soil by natural agents are called as nonbiodegradable.
For example, plastic.
a. Segregating and treating the non-biodegradable waste before putting in dustbins.
b. Recycle the plastics or glass present in non-biodegradable wastes.
c. Motivate people to use paper or jute bags instead of plastic bags.
Question. Suggest any four activities in daily life which are eco-friendly.
Answer. The eco-friendly activities in life are
a. Planting of trees
b. Segregating biodegradable and non-biodegradable wastes
c. Using cloth bags, jute bags or paper bags instead of plastic bags
d. Creating awareness on environment protection through initiatives and campaigns
e. Using of manures and organic agricultural methods Using less of chemical fertilizers and pesticides
f. Controlling pollution by using fuels like CNG.