NCERT Solutions Class 9 Kaushal Vikas Chapter 2: Rooftop Gardening PDF (2026-27)

Get complete, official step-by-step NCERT Solutions for Class 9 Skill Education (Kaushal Vikas) Chapter 2: Rooftop Gardening PDF for academic session 2026–27. This chapter is part of Work with Life Forms. All textbook in-text tasks, activities, portfolio assessments, and check-your-understanding questions have been verified by senior subject matter experts against the official NCERT prescribed syllabus.

NCERT Class 9 Kaushal Vikas Chapter 2 Textbook Solutions

Section 2.2 Process chart Questions & Solutions

Q1. PORTFOLIO: Which plants will you grow? Justify your choice.
Answer: Model Class 9 Student Answer:
I will select spinach, coriander, and cherry tomatoes for our rooftop garden.
Justification based on chapter text:
1. Life Cycle: According to the chapter, selected plants should have a short life cycle of 2 – 3 months. Spinach matures in 30 – 60 days, coriander in 25 – 30 days, and tomatoes in 55 – 70 days.
2. Sunlight & Space Requirement: Herbs and leafy vegetables like spinach and coriander grow well in partial shade or small pots, whereas sun-loving plants like tomatoes can be placed in open sunny areas receiving at least 5 – 6 hours of direct sunlight daily.
3. Usefulness & Water Needs:* Leafy vegetables provide fresh produce for school midday meals, and selecting plants that require little water reduces total water investment.

Section 2.3 Site visit Questions & Solutions

Q1. PORTFOLIO: Note your observations with reference to Table 2.2.
Answer: Model Site Visit Observation Log:
Process followed: Key steps observed include layout design, checking rooftop load limit (max 150 kg per square metre), waterproofing with tarpaulin liner, potting mixture preparation in 1:1:1 proportion, seed germination testing, daily morning irrigation, manual weeding, and organic pest control.
Tools and materials used: Materials used include grow bags, terracotta pots placed over beams, cocopeat, compost, watering cans, and bamboo screens stored neatly. Tools used include hand trowels (for digging/planting) and pruning scissors (for cutting stems), which were cleaned and stored safely with blades closed after use.
Safety protocols: Wore gloves while handling soil and organic matter, avoided overloading buckets to prevent physical strain, placed heavy containers near beams, and maintained strong parapet walls.
Schedules: Daily morning/evening watering, weekly weeding, and bi-weekly growth and pest monitoring.
Quality criteria: High seed germination percentage, loose airy potting mixture (pH 6.5 – 7.0), damage-free handling during harvest, and ventilated packaging.
Technology use: Used the Lux Meter mobile app to measure sunlight intensity on different parts of the roof and computer-aided design (CAD) software for digital layout planning.

Q2. Think of any other points for observation, while visiting the site. For example: 1. What does the gardener value the most about their work (for example, quality of produce, connect with nature, opportunity for employment, earnings, etc.)? 2. Possible challenges and how to overcome them
Answer: Model Class 9 Student Discussion Notes:
1. What the Gardener Values Most: The gardener values producing fresh, healthy, pesticide-free vegetables for family consumption, creating green spaces that make surroundings beautiful, cooling building temperatures during summer, and feeling happy and relaxed by connecting with nature.
2. Possible Challenges and How to Overcome Them:
Challenge 1 (Strong Rooftop Winds): Strong winds can damage young plants or throw pots off-balance. Solution: Protect young seedlings using small covers or nets, place pots against walls, or use bamboo screens and wind-breaks after recording wind direction for a week.
Challenge 2 (Water Seepage and Waterlogging): Excess water can seep into the roof slab or cause root rot. Solution: Place trays, tiles, or saucers under all pots to collect extra water, ensure proper drainage holes, and waterproof the roof with a tarpaulin liner.

Q3. Create a process chart for the work you will do.
Answer: Model Process Chart:
Task 1: Layout of rooftop garden — Dates: Week 1 (Oct 5 – Oct 7) — Responsibility: Layout Team
Task 2: Soil testing and potting mixture preparation — Dates: Week 1 (Oct 8 – Oct 10) — Responsibility: Growing Media Team
Task 3: Germination test — Dates: Week 2 (Oct 11 – Oct 25) — Responsibility: Seed Testing Group
Task 4: Sowing — Dates: Week 2 (Oct 26 – Oct 28) — Responsibility: Sowing Team
Task 5: Maintenance (irrigation and weeding) — Dates: Weeks 2 – 10 (Daily/Weekly) — Responsibility: Maintenance Crew
Task 6: Protection from pests — Dates: Weeks 3 – 10 (Bi-weekly) — Responsibility: Plant Protection Team
Task 7: Monitoring growth and providing nutrients — Dates: Weeks 4 – 10 (Weekly) — Responsibility: Growth Monitoring Team
Task 8: Harvesting — Dates: Weeks 8 – 12 (When mature) — Responsibility: Harvest Team
* Task 9: Packaging and transport — Dates: Weeks 8 – 12 (Post-harvest) — Responsibility: Packaging Group

Section 2.4 Designing the layout Questions & Solutions

Q1. PORTFOLIO: Draw and label a detailed sketch of the layout of your rooftop garden. Give reasons for your decisions related to the placement of pots.
Answer: Model Sketch Description & Justification:
Layout Description:
Area C (Roof Edge / Beams): Line of heavy terracotta pots and cement planters placed directly over supporting beams and roof edges.
Area B (Shade Zone): Herbs and leafy greens (spinach, coriander) placed under a shade net / bamboo screen.
Area E (Central Sun Zone): Light grow bags with sun-loving plants (tomatoes, cucurbits) placed in open areas receiving 5 – 6 hours of direct sunlight.
Area A & D: Walkways left clear for watering and general maintenance; water tap and drainage tray located near Area C.
Reasons for Placement Decisions based on chapter text:
1. Weight & Safety: Heavier containers are placed over beams or roof edges where the roof supports more load, keeping within safe structural weight limits.
2. Sunlight Needs: Sun-loving crops (tomatoes) are placed in open areas with at least 5 – 6 hours of direct sun, while herbs that cannot tolerate harsh direct sunlight are kept in partial shade.
3. Water & Space: Pots are placed on trays near drainage taps to collect excess water and prevent roof seepage, leaving adequate walkway space for maintenance.

Q2. CHECK YOUR UNDERSTANDING: On the basis of Figures 2.3 and 2.4, answer the following questions: 1. Why do you think some pots are placed in area B? Can you give examples of such plants from your geographic region? 2. Do you think the pots placed in area C can be placed in area E? Why or why not? 3. If the number of plants is increased, which area of the rooftop garden should be expanded first and why? 4. Do you think the layout has enough space to accommodate all the plants? Can you imagine any other layout?
Answer:
1. Area B Placement: Area B is a shade zone. Some pots are placed in Area B because certain plants cannot tolerate strong, direct sunlight and require partial shade to grow properly without wilting. Examples from our region include herbs and leafy vegetables like spinach, coriander, mint, and basil.
2. Pots in Area C vs Area E: No, heavy pots placed in Area C should not be placed in Area E. Area C is located over supporting beams or near roof edges where the roof can support higher load weight. Placing heavy pots in the central area (Area E) can overload the roof slab and damage the building structure.
3. Expanding the Garden: Area E (the open central sun zone) should be expanded first using lightweight pots or grow bags. This area receives direct sunlight needed for sun-loving plants, and using lightweight containers ensures total weight remains well within the roof’s safe load limit.
4. Space and Alternative Layout: Yes, the current layout provides adequate space between pots for walking, watering, and general maintenance. An alternative layout could use vertical trellises, bamboo racks, or wall-mounted hanging containers along parapet walls to utilize vertical space efficiently without increasing floor weight.

Section 2.7 Making Bill of Materials Questions & Solutions

Q1. PORTFOLIO: Prepare a Bill of Materials for your rooftop garden.
Answer: Model Bill of Materials (based on Table 2.5 template):

Terracotta pots: Quantity = 15; Estimated cost = ₹500; Remarks = As per space available on roof / convenience of use.
Hose pipe: Quantity = 10 m; Estimated cost = ₹600; Remarks = Length calculated as per distance between tap and most distant pot.
Bamboo for safety railing and trellis: Quantity = 3 pieces (5 m each); Estimated cost = ₹250; Remarks = For safety railing and climber support.
Potting mix: Quantity = 100 kg; Estimated cost = ₹0; Remarks = Donated by local nursery.
Cost of labour (Watering plants): Value = 0.5 hr × ₹25 × 4 times/wk = ₹50.
Cost of labour (Care and maintenance): Value = 0.5 hr × ₹25 × 2 times/wk = ₹25.
* TOTAL ESTIMATED COST: ₹1,425

Section 2.8 Pot preparation and sowing Questions & Solutions

Q1. TASK: Testing pH of potting mixture and adjusting pH for 20 pots/ containers of 1 L volume
Answer: Model Activity Report:
Step 1 (Testing): Followed the pH testing process from Chapter 1 by mixing a potting mix sample with water, letting it settle, and testing the liquid using pH indicator paper.
Step 2 (Observation & Adjustment): The initial pH was acidic (below 6.0). Added garden lime (calcium carbonate [a chemical compound used to reduce soil acidity]) at the rate of one tablespoon per pot mix and stirred thoroughly.
* Step 3 (Re-testing): Tested the pH again after mixing. Repeated trial-and-error additions until the pH reached the target range of 6.5 to 7.0, which is ideal for healthy plant nutrient absorption.

Q2. PORTFOLIO: Note the details of your work so far; you can use the template in Table 2.6.
Answer: Model Log (based on Table 2.6 template):
Plants you are growing: Spinach, Cherry Tomatoes, Coriander, Marigold.
Method of sowing: Direct seed sowing in nursery trays for spinach and coriander; transplanting germinated seedlings for tomatoes and marigolds.
Materials for potting mix, and proportion used: Cocopeat + Compost + Perlite mixed in 1:1:1 proportion to create a lightweight medium.
Result of pH testing of potting mixture and amendments: Initial pH was 5.5 (acidic); added garden lime to adjust and achieve a final pH of 6.8.

Q3. TASK: Testing seed germination rate — You can check the quality of seeds by testing their germination rate. Seed germination rate is also printed on seed packets, but it may vary in the field as per sowing conditions (for example, soil moisture and temperature).
Answer: Model Activity Procedure and Calculation:
Steps Followed (Figure 2.7):
1. Counted exactly 20 tomato seeds from the seed packet.
2. Planted them in a seedling tray filled with moist potting mixture at recommended planting depth.
3. Watered regularly using a spray bottle.
4. After 2 – 3 weeks, counted the germinated seedlings.
Observations & Result:
Seeds planted = 20
Germinated seedlings = 17
Germination percentage = (17 / 20) × 100 = 85%
Conclusion: The 85% germination rate matches the seed packet claim (80 – 90%), confirming high seed quality. The sprouted seedlings were carefully transplanted into rooftop pots.

Section 2.9 Maintenance and recording growth of plants Questions & Solutions

Q1. TASK: Estimating water requirement — To estimate the approximate amount of water required by your garden, you will need to calculate the Water Holding Capacity (WHC) of the potting mixture. WHC is the maximum amount of water that soil can hold; in this case, soil has been replaced by potting mixture (Figure 2.8).
Answer: Model Water Holding Capacity (WHC) Determination:
Steps Followed:
1. Added 500 g of dry potting mixture to a pot with drainage holes.
2. Weighed the dry potting mixture along with the container (Dry Weight = 700 g).
3. Slowly added water until the potting mix became completely saturated and water began dripping from the bottom.
4. Allowed excess water to drain out completely for 15 minutes, then weighed the saturated wet pot (Wet Weight = 840 g).
Calculation:
Water retained = Wet Weight − Dry Weight = 840 g − 700 g = 140 g (or 140 mL of water).
WHC (%) = (140 g / 500 g) × 100 = 28%
* Conclusion: The Water Holding Capacity of the potting mixture is 28 per cent. This helps estimate total water requirements and prevents both water stress (when demand for water exceeds supply) and root suffocation caused by heavy watering.

Section 2.10 Harvesting and storage Questions & Solutions

Q1. TASK: Observe how long the produce stays fresh in different storage conditions (for example, room temperature, refrigerator or wrapped in cloth).
Answer: Model Observation Log:
Spinach / Coriander (Leafy Greens):
Room temperature: Stayed fresh for 1 day; wilted rapidly due to water loss in heat.
Wrapped in damp cloth: Stayed fresh for 3 – 4 days in a cool, moist place without wilting.
Refrigerator (airtight container): Stayed fresh for up to 6 days.
Tomatoes (Fruit):
Room temperature: Stayed fresh and ripened naturally over 5 – 7 days.
Sealed plastic bag (no vents):* Spoiled within 2 days because trapped ethylene gas (a natural ripening gas emitted by fruits) and moisture caused rotting.

Section 2.13 Assess your learning Questions & Solutions

Q1. During a site visit, students notice that one rooftop garden uses grow bags, while another uses clay pots.
i. List one advantage and one disadvantage of each container.
ii. Which one would you recommend for your school rooftop garden and why?
Answer:
i. Advantages and Disadvantages:
Grow Bags:
Advantage: They are flexible and lightweight, making them easy to move around and safe for roof weight limits.
Disadvantage: They are less durable over long periods compared to rigid pots and can tear if dragged.
Clay Pots (Terracotta Pots):
Advantage: They are porous, allowing air and moisture to pass through, which prevents waterlogging around plant roots.
Disadvantage: They are heavier than grow bags, increasing the structural weight load on the roof.
ii. Recommendation: I recommend grow bags for a school rooftop garden. Grow bags reduce total structural weight on the roof slab, ensuring safety while being flexible and convenient for students to handle.

Q2. You have prepared two potting mixes as follows:
i. Mix A: Soil + Compost + Cocopeat
ii. Mix B: Soil only
After one month, plants grown in the Mix A potting mix look healthier and are lighter to carry, while plants in Mix B pot are heavy and waterlogged.
Explain why Mix A is better for rooftop gardening.
Answer: Mix A is better for rooftop gardening for two primary reasons based on the chapter text:
1. Weight Reduction: Ordinary garden soil is dense and heavy (a 1 L pot with soil-rich mix weighs ~700 g), whereas replacing or reducing soil with cocopeat and compost creates a lightweight mix (~290 g for 1 L pot), reducing structural load on the roof.
2. Aeration and Drainage: Ordinary soil packs tightly when watered, blocking oxygen from reaching roots and causing poor drainage, waterlogging, and root rot. Mix A remains loose and airy, ensuring proper root aeration and easy drainage of excess water.

Q3. A group of students noticed their tomato plants turning yellow despite regular watering. Later, they found out that the pots were waterlogged due to blocked drainage holes.
i. What went wrong?
ii. Suggest two preventive measures for the future.
Answer:
i. What Went Wrong: The drainage holes at the bottom of the pots became blocked. This caused heavy water accumulation (waterlogging), leading to suffocation of roots and yellowing of leaves because roots could not receive oxygen.
ii. Preventive Measures:
1. Use Drainage Trays and Mesh/Pebbles: Place a layer of broken pottery pieces or gravel over drainage holes before filling pots, and place pots on trays, tiles, or stands to ensure free drainage.
2. Use Airy Potting Mix: Use a loose, lightweight potting mix containing cocopeat, compost, and perlite instead of pure soil to prevent compaction.

Q4. A group of students harvests 5 kg of spinach, packs half in plastic bags and half in damp cloth. After two days, the spinach in a damp cloth is fresher.
i. Why did the spinach in a damp cloth stay fresh longer?
ii. What lesson does this give about packaging?
Answer:
i. Why Damp Cloth Kept Spinach Fresher: Leafy vegetables lose water and wilt quickly in dry heat. Wrapping spinach in a clean, damp cloth keeps it in a cool, moist environment that prevents water loss and wilting, whereas unventilated plastic bags trap heat and moisture, causing sweating and rotting.
ii. Lesson About Packaging: Packaging for fresh leafy produce must provide aeration and moisture retention rather than airtight plastic sealing, ensuring the produce stays fresh without rotting.

Q5. Your school has received a donation of 15 (6 inch) pots for rooftop gardening as well as spinach, tomatoes and marigold seeds.
i. Which plants will you select?
ii. Justify your choice based on agro-climatic conditions, usefulness (food/decoration), life cycle and water requirement.
Answer:
i. Selection: I will select spinach and marigold seeds for the 15 (6-inch) pots.
ii. Justification:
Container Size & Root Needs: 6-inch pots are small containers. Spinach (shallow roots) and marigold grow well in small pots, whereas tomato plants need larger, deeper pots to support heavy fruiting and deep root growth.
Life Cycle & Water Requirement: Spinach matures quickly in 30 – 60 days, providing fresh leafy greens for school midday meals, and requires moderate water.
Usefulness & Protection:* Spinach provides healthy food, while marigold provides flowers for school decoration and acts as a natural pest repellent (for example, marigolds deter aphids).

Q6. A family wants to try rooftop gardening, but is worried about the cost.
i. Suggest two recycled materials they can use as containers.
ii. How does recycling support the environment?
Answer:
i. Recycled Materials:
1. Discarded plastic buckets or paint tubs with drainage holes drilled in the bottom.
2. Old wooden crates, sinks, or durable woven grain bags.
ii. Environmental Benefits of Recycling: Recycling reduces solid plastic waste sent to landfills, lowers input costs for gardening, conserves natural resources, and turns unused urban spaces into green areas that reduce air pollution.

Q7. Of the tasks that you did, which did you enjoy the most? Which did you enjoy the least? Give examples of what went well and what did not go well. What would you do differently next time?
Answer: Model Reflection:
Task Enjoyed Most: Conducting the seed germination test in seedling trays and calculating the 85% germination rate after two weeks.
Task Enjoyed Least: Handling waterlogged heavy soil pots before switching to lightweight potting mix.
What Went Well: The 1:1:1 cocopeat, compost, and perlite mixture kept our containers lightweight and healthy, and tomato seedlings transplanted smoothly.
What Did Not Go Well: Young plants in open areas were bent by sudden strong winds because wind direction was not checked beforehand.
* What to Do Differently Next Time: Record wind direction using a wind vane for a week before placing pots, and install bamboo trellises and wind-break screens early.

Q8. Give examples of how you can apply your learning in a real-life situation.
Answer:
1. Home Gardening: Prepare a 1:1:1 lightweight potting mix (cocopeat + compost + soil/perlite) and test its pH using indicator strips before growing vegetables in balcony containers.
2. Seed & Water Management: Perform seed germination tests before planting to verify seed quality, and calculate Water Holding Capacity (WHC) to set proper irrigation schedules without over-watering.
3. Organic Pest & Weed Control: Use organic remedies like neem spray or chilli-garlic spray for aphids and caterpillars, use organic mulching (bark or straw) to suppress weeds, and manually weed pots by pulling roots steadily.
4. Harvesting & Freshness: Harvest vegetables in early morning or late evening using pruning shears, wrap leafy greens in clean damp cloth, and use ventilated boxes for tomatoes to allow ethylene gas to escape during transport.

More Kaushal Vikas Chapters & Study Resources

• ⬅️ Previous: Chapter 1: Introduction to Agricultural Practices
• ➡️ Next: Chapter 3: Precision Farming
• 📚 All Class 9 NCERT Books: Class 9 NCERT Books (2026–27)
• 📖 Full Library: All NCERT Books PDF (Class 1–12)

Frequently Asked Questions (FAQs)

Q1: What is the main objective of Kaushal Vikas Chapter 2?
Ans: Chapter 2 (Rooftop Gardening) provides Grade 9 students with foundational vocational knowledge, real-world skill-building tasks, and practical applications in Work with Life Forms.

Q2: Are these solutions verified according to the 2026–27 CBSE curriculum?
Ans: Yes. All questions, exercises, and tasks are solved directly from the official NCERT 2026–27 textbook following official NCERT pedagogical guidelines and the latest CBSE marking scheme.