MCQ Questions For Class 10 Science Chapter 15 Our Environment

Students can refer to the following MCQ Questions for Class 10 Our Environment with Answers provided below based on the latest curriculum and examination pattern issued by CBSE and NCERT. Our teachers have provided here a collection of multiple choice questions for Our Environment Class 10 covering all topics in your textbook so that students can assess themselves on all important topics and thoroughly prepare for their exams

Our Environment Class 10 Science MCQ Questions with Answers

We have provided below MCQ questions for Class 10 Our Environment with answers which will help the students to go through the entire syllabus and practice multiple choice questions provided here with solutions. As Our Environment MCQs for Class 10 Science pdf download can be really scoring for students, you should go through all problems provided below so that you are able to get more marks in your exams.

Question. An environment friendly practice is     
a) Using CFLs at homes and offices
b) Using car to go to nearby places
c) Using AC in every room
d) Burning plastics

Question. Which of the following limits the number of trophic levels in a food chain           
a) Water
b) Polluted air and water
c) Deficient food supply
d) Decrease in energy at higher trophic levels

Question. The harmful chemical which is accumulating in human beings through food chain is       
a) BHC
b) DDT
c) Abscisic acid
d) CFC

Question. Carnivores represent               
a) Primary consumers
b) Reducers
c) Phytoplanktons
d) Secondary and tertiary consumers

Question. The cleaners of nature are   
a) Producers
b) Consumers
c) Herbivores
d) Decomposers

Question. Ozone hole may cause       
a) Mutations
b) Global warming
c) Skin cancer
d) All of these

Question. The reproduction is essential for population of a species
a) to decrease its number
b) to increase its number
c) for its survival
d) to become extinct

Question. In the list of organisms given below, those that reproduce by the asexual method are
(i) banana (ii) dog (iii) yeast (iv) amoeba
a) (ii) and (iv)
b) (i), (iii) and (iv)
c) (i) and (iv)
d) (ii), (iii) and (iv)

Question. In a flower, the parts that produce male and female gametes (germ cells) are
a) stamen and anther
b) filament and stigma
c) anther and ovary
d) stamen and style

Question. Which of the following is the correct sequence of events of sexual reproduction in a flower?
a) pollination, fertilisation, seedling, embryo
b) seedling, embryo, fertilisation, pollination
c) pollination, fertilisation, embryo, seedling
d) embryo, seedling, pollination, fertilisation

Question. The copying of DNA occur during 
a) cell formation
b) cell division
c) protein synthesis
d) reproduction

Question. The main cause of variations among organisms during sexual reproduction is
a) Errors in copying DNA
b) Errors in RNA
c) Errors in both RNA and DNA
d) Genetic drift

Question. In human females, an event that reflects onset of reproductive phase is
a) growth of body
b) changes in hair pattern
c) change in voice
d) menstruation

Question. In human males, the testes lie in the scrotum, because it helps in the
a) process of mating
b) formation of sperm
c) easy transfer of gametes
d) all the above

Question. Which among the following is not the function of testes at puberty?
(i) formation of germ cells (ii) secretion of testosterone
(iii) development of placenta (iv) secretion of estrogen
a) (i) and (ii)
b) (ii) and (iii)
c) (iii) and (iv)
d) (i) and (iv)

Question. Fertilisation is the process of
a) transfer of male gamete to female gamete.
b) fusion of nuclei of male and female gamete.
c) adhesion of male and female reproductive organs.
d) the formation of gametes by a reproductive organ.

Question. Offspring formed by asexual method of reproduction have greater similarity among themselves because
(i) asexual reproduction involves only one parent
(ii) asexual reproduction does not involve gametes
(iii) asexual reproduction occurs before sexual reproduction
(iv) asexual reproduction occurs after sexual reproduction
a) (i) and (ii)
b) (i) and (iii)
c) (ii) and (iv)
d) (iii) and (iv)

Question. During adolescence, several changes occur in the human body. Mark one change associated with sexual maturation in boys.
a) loss of milk teeth
b) increase in height
c) cracking of voice
d) weight gain

Question. In a food chain third trophic level is always occupied by     
a) Carnivores
b) Herbivores
c) Producers
d) Decomposers

Question. The biotic components of an ecosystem consist of             
a) Plants and animals
b) Algae and fungi
c) Producers, consumers & decomposers
d) Air, water, soil

Question. Which of the following could be incinerated           
a) Paper
b) Medicine bottles
c) Needle of syringe
d) All of these

Question. What is the main reason for increase in temperature in a glass house?
(a) Sunlight is completely absorbed by plants in the glass house
(b) Radiation fails to escape from the glass house completely
(c) Plant do not utilize sunlight in a glass house
(d) Plants produce heat inside the glass house

Question. DDT is non-biodegradable chemical when it enters food chain it gets accumulated in each trophic level. This phenomenon is called as –
(a) Eutrophication
(b) Chemical amplification
(c) Biomagnification
(d) Chemical magnification 

Question. The following diagram shows a simple version of energy flow through food web. 73
What happens to energy having the decomposers?
(a) It is used by the decomposers itself.
(b) It is reflected from the surface of earth.
(c) It is lost as heat
(d) It is used in natural biocomposting

Question. Assertion: Pond ecosystem is upright in the pyramid of number.
Reason: Phytoplanktons are maximum and secondary consumers are lesser in number.
(a) Statement (A) and (B) both are correct.
(b) Statement (A) is correct but (B) is incorrect.
(c) Statement (A) and (B) both are incorrect.
(d) Statement (A) is incorrect but (B) is correct.

Question. Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called
(a) decomposers
(b) producers
(c) herbivores
(d) carnivores

Question. Read the following statements carefully.
(I) Energy transfer in the biotic world always proceeds from the autotrophs.
(II) Energy flow is unidirectional.
(III) Energy availability is maximum at the tertiary level.
(IV) There is loss of energy from one trophic level to the other.
Select the relevant statements for the forest ecosystem
(a) I, II and IV
(b) I, II and III
(c) I, III and IV
(d) II, III and IV

Question. In the given diagram, the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available?
(a) T₄
(b) T₂
(c) T₁
(d) T₃

Question. Which of the following pair is incorrectly matched ?
(a) Autotrophs – Fungi
(b) Primary consumers – Zooplankton
(c) Secondary consumers – Fishes
(d) Decomposers – Fungi

Question. What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
(a) 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. In a highly pesticide polluted pond. Which of the following aquatic organisms will have the maximum amount of pesticide per gram of body mass?
(a) Lotus
(b) Fishes
(c) Spirogyra
(d) Zooplanktons

Question. Which of the statement is incorrect?
(a) 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. Abundance of coliform bacteria in a water body is indicative of pollution from
(a) petroleum refinery
(b) metal smelter
(c) fertilizer factory
(d) domestic sewage

Question. Which of the following constitutes a food chain       
(a) Grass, goat and human
(b) Goat, crow and elephant
(c) Grass, fish and zebra
(d) Grass, wheat and apple

Question. Biodegradable wastes include       
(a) Aluminium foils
(b) Glass bottles
(c) Pesticides
(d) Wood shavings

Which group of waste materials can be classified as non-biodegradable?  
(a) plant waste, used tea bags
(b) polyethene bags, plastic toys
(c) used tea bags, paper straw
(d) old clothes, broken footwear

Question. Which of the following statement regarding recycling is wrong?       
(a) Saves precious resources
(b) Require stable market
(c) Improves efficiency of treatment processes
(d) Increases the needs for mining virgin materials

Question. The decomposers in an ecosystem:           
(a) Convert organic material to inorganic forms
(b) Convert inorganic material to simpler forms
(c) Convert inorganic material into organic compound
(d) Do not break down organic compound

True Or False :

Question. Biodegradable wastes should be separated and kept in blue colour bins for garbage collectors.

Question. Human population and technology are having a destructive impact on the biosphere.

Question. Secondary consumers in a food chain are always carnivores.

Question. Carbon dioxide causes depletion of ozone layer thereby allowing more UV-radiations to reach the earth.

Question. Earth is kept warm due to green house flux. 

Assertion-Reason type Questions :

For question numbers 1 and 2 two statements are given-one labeled as Assertion a) and the other labeled
Reason (R). Select the correct answer to these questions from the codes a), b), c) and d) as given below:
a) Both ‘A’ and ‘R’ are true and ‘R’ is correct explanation of the assertion.
b) Both ‘A’ and ‘R’ are true but ‘R’ is not correct explanation of the assertion.
c) ‘A’ is true but ‘R’ is false.
d) ‘A’ is false but ‘R’ is true.

Question. Assertion: DNA is deoxyribonucleic acid.
Reason: DNA transfers genetic characteristics from parents to offsprings.

Question. Assertion: There are three types of RNA, t-RNA, m-RNA and r-RNA.
Reason: RNA does not undergo replication.

For question numbers 1 and 2 two statements are given-one labeled as Assertion a) and the other labeled
Reason (R). Select the correct answer to these questions from the codes a), b), c) and d) as given below:
a) Both ‘A’ and ‘R’ are true and ‘R’ is correct explanation of the assertion.
b) Both ‘A’ and ‘R’ are true but ‘R’ is not correct explanation of the assertion.
c) ‘A’ is true but ‘R’ is false.
d) ‘A’ is false but ‘R’ is true.

Question. Assertion: Pollination is different from fertilisation.
Reason: The process of transfer of pollens from anther to stigma is called pollination which takes place in plants.

Question. Assertion: Pistil is male reproductive part of flower.
Reason: Pollen grain land on stigma and germinate.

For question numbers 1 and 2 two statements are given-one labeled as Assertion a) and the other labeled
Reason (R). Select the correct answer to these questions from the codes a), b), c) and d) as given below:
a) Both ‘A’ and ‘R’ are true and ‘R’ is correct explanation of the assertion.
b) Both ‘A’ and ‘R’ are true but ‘R’ is not correct explanation of the assertion.
c) ‘A’ is true but ‘R’ is false.
d) ‘A’ is false but ‘R’ is true.

Question. Assertion: Cell division is a type of reproduction in unicellular organisms.
Reason: It leads to formation of two daughter cells where means is to produce more individuals.

Question. Assertion: Spores are formed in sporangia.
Reason: Spores grow into separate individuals in moist conditions.

In the following question, a statement of Assertion (A) is followed by a statement of Reason (R). Answer these questions by selecting appropriate option given below:
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
(c) Assertion (A) is true but Reason (R) is false.
(d) Assertion (A) is false but Reason (R) is true.

Question. Assertion (A): Ozone is both beneficial and damaging.   
Reason (R): We should stop the release of chlorofluorocarbons to protect the ozone.

Question. Assertion (A): Biomagnification is caused due to the accumulation of biodegradable toxicants in organisms at each successive trophic level.    
Reason (R): Biomagnification leads to the maximum accumulation of chemicals in small fishes.

Question. Assertion (A): Autotrophs are present at the first trophic level.   
Reason (R): Consumers or heterotrophs fix energy making it available for autotrophs.   

Question. Assertion (A): The crown fires are most destructive as they burn the tree top.   
Reason (R): Due to crown fire the temperature of that area may rise upto 700° C.

Question. Assertion (A): Polythene bags and plastic containers are non-biodegradable substance.   
Reason (R): They can be broken down by micro-organisms in natural simple harmless substances.