Class 10 Science Chapter 15 Our Environment MCQ Questions with Answer

Our Environment Class 10 MCQ is one of the best strategies to prepare for the CBSE Class 10 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more Our Environment class 10, which will help them all through their board test.

Our Environment Class 10 MCQ Questions with answer

Class 10 Science MCQ with answers are given here to Chapter 15 Our Environment. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 10 Science syllabus. By Solving these Class 10 MCQs, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 10 Annual exam.

Learn Our Environment Class 10 MCQ with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Class 10 Our Environment MCQ with answers given below.

Question 1. The harmful chemical which is accumulating in human beings through food chain is       
a) BHC
b) DDT
c) Abscisic acid
d) CFC

Question 2. Carnivores represent               
a) Primary consumers
b) Reducers
c) Phytoplanktons
d) Secondary and tertiary consumers

Question 3. 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 4. 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 5. 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 6. 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 7. The cleaners of nature are   
a) Producers
b) Consumers
c) Herbivores
d) Decomposers

Question 8. Ozone hole may cause       
a) Mutations
b) Global warming
c) Skin cancer
d) All of these

Question 9. 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 10. 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 11. 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 12. 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 13. The copying of DNA occur during 
a) cell formation
b) cell division
c) protein synthesis
d) reproduction

Question 14. 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 15. 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 16. 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 17. 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 18. 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 19. Which of the following could be incinerated           
a) Paper
b) Medicine bottles
c) Needle of syringe
d) All of these

Whoever needs to take the CBSE Class 10 Board Exam should look at this MCQ. To the Students who will show up in CBSE Class 10 Science Board Exams, It is suggested to practice more and more questions. Aside from the sample paper you more likely had solved. These Our Environment Class 10 MCQ are ready by the subject specialists themselves.

Question 20. 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 21. In a food chain third trophic level is always occupied by     
a) Carnivores
b) Herbivores
c) Producers
d) Decomposers

Question 22. 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 23. 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 24. 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 25. 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 26. 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 27. Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called
(a) decomposers
(b) producers
(c) herbivores
(d) carnivores

Question 28. 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 29. 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 30. 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 31. Which of the following pair is incorrectly matched ?
(a) Autotrophs – Fungi
(b) Primary consumers – Zooplankton
(c) Secondary consumers – Fishes
(d) Decomposers – Fungi

Question 32. 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 33. 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 34. 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 35. 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 36. 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 37. 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

Question 38. Biodegradable wastes include       
(a) Aluminium foils
(b) Glass bottles
(c) Pesticides
(d) Wood shavings

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