GeographyISC Class 11 · Climate Change

Climate Change in India, Adaptation and Rainfall Practical (ISC Class 11 Geography)

Updated 17 October 2026 · Fact-checked

India's average temperature rose about 0.7 degrees C between 1901 and 2018, with more heatwaves, erratic monsoons, extreme rain, retreating glaciers and rising seas. Cities adapt through heat action plans, cool roofs and water management; villages through watersheds, drip irrigation, resilient crops and insurance. The practical uses a rain gauge and bar graphs.

Warming of about 0.7°C causes heatwaves, erratic rain, melting glaciers and rising seas, so cities and villages adapt in different ways.

Illustration drawn for QuestionBuddy.

Understand Climate Change in India, Adaptation and Rainfall Practical

Changes in India. Rising temperature (about 0.7 degrees C between 1901 and 2018), more frequent and intense heatwaves, more erratic monsoon with longer dry spells and extreme rainfall events (urban floods as in Mumbai and Chennai), droughts and floods, retreating Himalayan glaciers with risk of glacial lake outburst floods, sea-level rise threatening the Sundarbans, and more severe Arabian Sea cyclones. Effects: lower crop yields, water scarcity, vector-borne diseases, loss of biodiversity and coastal livelihoods.

Mitigation and adaptation. Mitigation reduces causes (emissions); adaptation adjusts to changes already happening, which the syllabus stresses.

Urban adaptation. Heat action plans (Ahmedabad 2013); cool roofs and green cover; compulsory rainwater harvesting and groundwater recharge; better storm-water drains and protection of natural channels and wetlands; climate-smart buildings and mangrove protection; public transport and clean energy. National Action Plan on Climate Change (2008).

Rural adaptation. Watershed development, check dams, farm ponds, johads; drip and sprinkler irrigation; climate-resilient crops, changed sowing dates, millets and pulses; crop insurance (PM Fasal Bima Yojana, 2016), weather advisories and soil health cards; agroforestry and contour bunding; livelihood diversification.

Practical. A rain gauge: a cylinder with a funnel of known diameter and a collecting bottle, in an open space with its rim about 30 cm above the ground; water is poured daily into a measuring cylinder graduated in mm. Bar graph: months on the x-axis, rainfall in mm on the y-axis, equal-width bars with gaps, title, scale and key. Departure from normal (%) = (actual - normal)/normal x 100; mean = total / number of months.

Climate Change in India, Adaptation and Rainfall Practical: key facts

Rainfall departure: $D e p a r t u r e ($
Mean rainfall: $M e an = t o t a l r ain f a l l / n u mb er o f m o n t h s ∣ S am e u ni tt h r o ug h o u t$
Changes in India: +0.7 degrees C, 1901-2018
Heatwaves
Erratic monsoon
Glacier retreat
Sea-level rise
Adaptation: Urban: heat plans, cool roofs, drains | Rural: watersheds, drip irrigation, resilient crops, insurance

How to answer Climate Change in India, Adaptation and Rainfall Practical questions

Questions combine description (4 marks) with rainfall data handling (3 to 4 marks).

1List observed changes with the instrument or period given.
2Divide adaptation into urban and rural, with one named measure each.
3For rainfall sums, apply the formula and keep sign and unit.
4For graphs, give title, axes, scale and equal bars.

Climate Change in India, Adaptation and Rainfall Practical in real life

The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Rainfall departure

Suppose normal seasonal rainfall at a station is 920 mm and the actual rainfall this year is 1,150 mm.

Find the departure from normal.

Try it first, then show the solutionSolution

Departure = (1,150 - 920)/920 x 100.
= 230/920 x 100 = 25 per cent above normal.

Answer: +25 per cent.

Memory hook: Actual minus normal over normal.

Mean over months

Suppose monsoon rain totals 210, 340, 300 and 190 mm in four months.

Find the mean monthly rainfall.

Try it first, then show the solutionSolution

Total = 210 + 340 + 300 + 190 = 1,040 mm.
Mean = 1,040/4 = 260 mm.

Answer: 260 mm.

Memory hook: Total divided by months.

Tricks to remember Climate Change in India, Adaptation and Rainfall Practical

Short memory aids. Say each one aloud once, then use it on a question the same day.

Mitigate cause, adapt to effect
Mitigation cuts causes; adaptation copes with effects.
Use it when: Definitions.
Rain gauge 30 cm
Rim about 30 cm above ground in the open.
Use it when: Practical.

Climate Change in India, Adaptation and Rainfall Practical: solved examples

Ordered from board level to HOTS. Try each one before you open the solution.

Example 1: Rural measure · 1 mark · MCQBoard level

Which of these is mainly a rural adaptation measure?
(a) Cool roofs
(b) Watershed development
(c) Heat action plan
(d) Storm-water drains

Try it first, then show the solutionSolution

Farm and village water.

Answer: (b) Watershed development.

Example 2: Mitigation versus adaptation · 3 marks · Short answerBoard level

Distinguish between mitigation and adaptation with one example each.

Try it first, then show the solutionSolution

Mitigation reduces causes.
Example: cutting emissions with clean energy.
Adaptation adjusts to changes already happening, e.g., rainwater harvesting.

Answer: Mitigation reduces emissions; adaptation copes with effects, e.g., drip irrigation.

Example 3: Departure sums · 4 marks · Long answerHarder board level

A station's normal seasonal rainfall is 720 mm, and this year it recorded 540 mm. Find the departure from normal and name the condition. Another station's normal is 920 mm with actual 1,150 mm; find its departure.

Try it first, then show the solutionSolution

First: (540 - 720)/720 x 100 = -180/720 x 100 = -25 per cent, a deficit.
Second: (1,150 - 920)/920 x 100 = 230/920 x 100 = +25 per cent, surplus.
Negative departure means below normal; positive means above.
Both are 25 per cent from normal in opposite directions.

Answer: -25 per cent (deficit); +25 per cent (surplus).

Example 4: Urban measures · 4 marks · Long answerHarder board level

Describe four measures cities can adopt to adapt to heatwaves and floods.

Try it first, then show the solutionSolution

Heat action plans with early warnings and drinking-water points.
Cool roofs and green cover to cut the heat island.
Rainwater harvesting and lake revival for water.
Better storm-water drains and freeing natural drainage channels.

Answer: Heat plans, cool roofs, rainwater harvesting and drains.

Example 5: Glacier and coast · 5 marks · Case-basedHOTS / competency

Case: A news story reports retreating Himalayan glaciers and a rising sea at the Sundarbans. (a) State the 1901-2018 temperature rise and compute the average rise per decade (to two decimals). (b) Name a hazard linked with retreating glaciers. (c) Suggest one adaptation for coastal cities from the chapter.

Try it first, then show the solutionSolution

(a) 2018 - 1901 = 117 years = 11.7 decades; 0.7/11.7 = 0.0598, about 0.06 degrees C per decade.
(b) Glacial lake outburst floods and falling river flows.
(c) Protect mangroves.

Answer: (a) 0.7 degrees C; about 0.06 per decade (b) glacial lake outburst floods (c) mangrove protection.

Where students lose marks in Climate Change in India, Adaptation and Rainfall Practical

The slips examiners see most often, and what to write instead.

Mistake: Departure over actual
Wrong denominator.
Wrong working
(1,150 - 920)/1,150
Right working
(1,150 - 920)/920
Do this: Divide by normal.
Usually costs: 2 marks.
Mistake: Bars without a scale
Graph incomplete.
Do this: Give a title, scale, key and equal bars.
Usually costs: 1 to 2 marks.
Mistake: Ignoring the sign
Deficit written as surplus.
Do this: Keep the negative sign for a deficit.
Usually costs: 1 mark.

Exam tips

Use urban and rural headings.
Give one named scheme or plan.
Draw bar graphs with a scale.
State the sign of the departure.

Practice questions on Climate Change in India, Adaptation and Rainfall Practical

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

Q1 · 1 mark · MCQBoard level
In a bar graph of monthly rainfall, the x-axis shows:
(a) rainfall in mm
(b) months
(c) temperature
(d) stations
Hint
Categories.
Answer
(b) Months.
Q2 · 3 marks · Short answerHarder board level
Monthly rainfall totals are 60, 180, 420, 380 and 110 mm over five months. Find the mean.
Hint
Total divided by 5.
Answer
Total = 60 + 180 + 420 + 380 + 110 = 1,150 mm; mean = 1,150 / 5 = 230 mm.
Q3 · 4 marks · Long answerHarder board level
Describe how to set up and use a rain gauge.
Hint
Open space, 30 cm rim.
Answer
Place the cylinder with its funnel in an open space away from trees and buildings, with the rim about 30 cm above the ground. At a fixed time each day pour the collected water into a measuring cylinder graduated in mm and record the depth.
Q4 · 4 marks · Long answerHarder board level
Explain four rural measures to adapt to climate change.
Hint
Water, crops, insurance.
Answer
Watershed development and check dams conserve water; drip irrigation saves it; resilient crops and changed sowing dates cope with drought and heat; crop insurance and weather advisories reduce risk.
Q5 · 4 marks · Case-basedHOTS / competency
Case: A city has an urban flood after extreme rain. (a) Name the trend in monsoon rainfall linked with this. (b) Suggest two measures. (c) Name the 2008 national plan.
Hint
Extreme events.
Answer
(a) More frequent extreme rainfall events within an erratic monsoon. (b) Better storm-water drains and wetlands kept free of encroachment, rainwater harvesting. (c) National Action Plan on Climate Change.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

1.Rain gauge rim height?Show answer
About 30 cm.
2.Year of NAPCC?Show answer
2008.
3.Temperature rise in India?Show answer
About 0.7 degrees C, 1901-2018.
4.Crop insurance scheme?Show answer
PM Fasal Bima Yojana, 2016.
5.Departure formula?Show answer
(actual - normal)/normal x 100.

Climate Change in India, Adaptation and Rainfall Practical: frequently asked questions

Why is adaptation stressed?

Some changes are already happening.

What is a heat action plan?

Early warning and response measures for heatwaves.

What does the bar graph show?

Seasonal variation in rainfall.