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ISC Class XII Prelims 2026 : Environmental Science (Delhi Public School (DPS), Newtown, Kolkata)

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Adhrit Layek
Delhi Public School (DPS), Newtown, Kolkata

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DELHI PUBLIC SCHOOL NEWTOWN SESSION 2025-26 PRE BOARD EXAMINATION CLASS: XII SUBJECT: ENVIRONMENTAL SCIENCE [SET A] FULL MARKS: 70 TIME: 3 HOURS Instructions to Candidates You are allowed additional 15 minutes for only reading the question paper. You must NOT start writing during the reading time. This question paper has five printed pages. It is divided into three sections and has 12 questions in all. All questions are compulsory. Answer all questions. Section A has fourteen subparts which are very short answer questions. Each question carries 1 mark. While attempting Multiple Choice Questions in Section A, you are required to write only ONE option as the answer. Section B has seven questions which are short answer questions. Each question carries 4 marks. Section C has four questions which are long answer questions. Each question carries 7 marks. Internal choices have been provided in two questions in Section B and in one question in Section C. The intended marks for questions are given in brackets [ ]. SECTION A -14 MARKS Question 1 (i) Choose the bio indicator of soil (a) Organic matter content (c) Soil crusting [1] (b) pH (d) BOD (ii) One of the push factors responsible for migration of people is (a) Entertainment (b) Better education facilities (c) Breakdown of epidemics (d) Better housing facilities [1] (iii) Given below are two statements marked Assertion and Reason.Read the two statements carefully and choose the correct option. Assertion (A): Ecotourism focuses on socially responsible travel, personal growth and environment sustainability. Reason (R): Ecotourism is characterized by conscientious low impact visitor behavior and generates profit for rich businessmen. (a) Both A and R are true and R is the correct explanation for A (b) Both A and R are true but R is not the correct explanation for A. (c) A is true and R is false. (d) A is false and R is true. [1] A/1 (iv) An eye surgeon wants to preserve the cornea of an eye donated by another patient. It is preserved in liquid nitrogen by maintaining a temperature of -196 degrees Celsius. Name the term that defines the above process being used. (a) Tissue culture (b) Cryopreservation (c) Gene bank (d) Grafting [1] (v) Study the relationship between the first and second words given below and fill in the fourth word on that basis. (a) Iron ore : Localized:: Air:______________ (b) CO: Primary pollutant :: ___________:Secondary pollutant [2] (vi) The image below illustrates a critical global environmental problem alongside its underlying causes. Study the picture carefully and choose the CORRECT option from the options given below. [1] (Source: https://easy-peasy.ai/ai-image-generator/images/climate-change-sketchmeltingglacier-industrial-smokestacks ) (a) Problem -ozone depletion, cause- deforestation, industrialisation. (b) Problem- eutrophication, cause- nuclear radiation and deforestation (c) Problem- global warming cause- deforestation and industrialisation. (d) Problem urbanisation, cause- migration, developmental activities. (vii) The table below shows the population dynamics of a village in a particular year. Use the data in the table below to calculate the population size of this village at the yearend. Choose the correct answer for X from the options given below. Population at the beginning of the year Total Births (B) Recorded Deaths (D) Recorded Immigrants (I) Recorded Emmigrants (E) Final population at the year end (a) 15,850 (b) 15,350 15000 650 210 160 250 X (c) 13,730 A/2 (d) 16270 [1] (viii) Write the expanded forms of the following: (a) IMF (b) CBA [2] (ix) Write a term for the description given below [4] (a) An ideology that sees critical connections between domination of nature and the exploitation of women (b) The increase in the amount of goods and services produced by an economy over time. (c) An exclusive right given to an inventor to ensure that no other person is making, using or selling the invention. (d) The term used to describe the distribution of age groups in a population. SECTION B- 28 MARKS Question 2 (i) Who propounded the concept of Deep ecology? What are its propositions? OR (ii) Compare and contrast the strengths of Gross National Product (GNP) in relation to Gross Domestic Product (GDP), emphasizing how each metric offers unique insights into a nation's economic activity. Question 3 Wildlife biologists are planning a conservation program for sea turtles along the eastern coast of India. They observed that thousands of hatchlings emerge each season, but only a few survive to adulthood. Most die due to predators, human interference, and habitat loss. To design an effective protection plan, the biologists decided to study the survivorship pattern of the species. Identify the survivorship curve shown by the sea turtles. Explain what the curve indicates about their survival strategy. [4] [4] [4] Question 4 What is protectionism? What treats does it have for the home country? [4] Question 5 DDT concentration in the water of a lake that supplies potable water to the nearby villages was found to be 0.003 ppm. It was reported that native birds like kingfisher near the lake were found to have 2 ppm of DDT in their bodies. With reference to the context, answer the questions that follow. (a) State the reason behind the findings. (b) Name the phenomenon and explain it briefly. [1] [3] Question 6 (i) There was a need for green revolution when India went for it in the early years after independence. List any four points on how agriculture can be made sustainable in India. OR (ii) Sustainable development is essential but difficult to achieve. Justify this statement by explaining the main challenges involved. A/3 [4] [4] Question 7 TNCs are the most important players involved in environmentally damaging activities. Discuss. [4] Question 8 (i) Identify the product which is being traded in the above picture. [1] (ii) Which convention put a ban on trade of such products? What were its consequences? [3] SECTION C-28 MARKS Question 9 Read the following passage and answer the questions given below: (i) Is the diagram justified? Discuss. (ii) How is the above mentioned forestry different from Joint Forest Management? Question10 (i) Identify major sources of vehicular pollution and suggest measures for its control in India. (ii) State the objectives of smart growth. OR (i) The Government of India has launched several programs such as Swachh Bharat Abhiyan, Beti Bachao Beti Padhao, Jal Jeevan Mission, and National Solar Mission to align with the United Nations Sustainable Development Goals (SDGs) 2030. Define SDG. Which SDGs are addressed by these initiatives? A/4 [3] [4] [4] [3] [4] (ii) Explain any three physical indicators of soil. [3] Question 11 (i) A recent report highlights that the fertility rate in India is slowly declining, especially [5] in urban areas. Experts attribute this to increased awareness of family planning, higher levels of female education, and economic considerations.Government campaigns promoting maternal and child health have also played a role in reducing unnecessary births. (Source: The Times of India, 15th October 2025 India s Fertility Rate Shows Gradual Decline ) Explain the factors that affect birth rate in India. (ii) Countries such as Sweden show stationary age pyramid. What does the statement [2] signify? Question 12 Read the passage given below and answer the questions that follow: Many developing countries receive foreign aid to fund development projects in education, healthcare, and infrastructure. However, a significant portion of this aid comes with conditions: recipient countries must purchase goods or hire services from the donor nation. While this ensures quality and technical support, it often increases project costs and limits the recipient country s freedom to choose locally suitable solutions. (i) Identify and define the type of aid mentioned in the paragraph. (ii) How is this type of aid advantageous? (iii) Why do critics believe this kind of aid may lead to controversy? A/5 [2] [2] [3]

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