SEBA Class 9 Science Important Chapter 15 Improvement in Food Resources

SEBA Class 9 Science Important Chapter 15 Improvement in Food Resources Solutions English Medium As Per SEBA New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters SEBA Class 9 General Science Additional Solutions and select need one. NCERT Important Solutions For Class 9 General Science Download PDF. Important Notes for Class 9 Science.

SEBA Class 9 Science Important Chapter 15 Improvement in Food Resources

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. Assam SEBA Board Class 9 Science Additional Question Answer are part of All Subject Solutions. Here we have given CBSE Class 9 Science Important Notes for All Chapters, You can practice these here.

Improvement in Food Resources

Chapter: 15

IMPORTANT QUESTION ANSWER

Answer the Following Question:

1. What are macronutrients?

Ans: Nutrients required in large quantities by plants, such as nitrogen, phosphorus, and potassium.

2. Which bee variety is commonly used in commercial honey production?

Ans: Apis mellifera.

3. What is organic farming?

Ans: Farming with minimal or no use of chemicals and maximum use of organic inputs. 

4. What is fumigation?

Ans: A method of killing pests using chemical fumes during storage.

5. Name one pest control method that does not use chemicals.

Ans: Mechanical removal of weeds.

6. What is mariculture?

Ans: Culture of marine organisms like fish and prawns in seawater.

7. What are the three main methods to improve crop yield?

Ans: The three methods are:

(i) Crop variety improvement – developing better seeds via hybridisation or genetic modification.

(ii) Crop production improvement – managing nutrients, water, and cropping patterns.

(iii) Crop protection management – controlling weeds, pests, and diseases.

8. What is intercropping? State two advantages.

Ans: Intercropping is growing two or more crops in a fixed pattern (like alternate rows) on the same field.

Advantages:

(i) Reduces spread of pests and diseases.

(ii) Efficient use of nutrients and soil.

9. Explain the term ‘composite fish culture’.

Ans: It is the practice of growing five or six different fish species in one pond. Each species occupies a different part of the pond (surface, middle, bottom) and consumes different types of food, avoiding competition and increasing yield.

10. Name four macronutrients needed by plants and mention their importance.

Ans: (i) Nitrogen (N): Promotes leaf growth.

(ii) Phosphorus (P): Enhances root development.

(iii) Potassium (K): Provides disease resistance.

(iv) Calcium (Ca): Important for cell wall development.

11. Define hybridisation. Mention its types.

Ans: Hybridisation is the crossing of genetically different plants to combine desirable traits.

Types:

(i) Intervarietal.

(ii) Interspecific.

(iii) Intergeneric.

12. Explain how irrigation improves crop production.

Ans: Irrigation ensures consistent water supply, helping in:

(i) Proper nutrient absorption.

(ii) Growth during dry spells.

(iii) Higher yield and productivity.

13. What is bee-keeping? Mention any two important points to ensure good honey production.

Ans: Bee-keeping is rearing honey bees for honey and wax.

Points to consider:

(i) Use of healthy queen bee and high-yield species.

(ii) Good pasturage and floral sources.

14. Write a short note on marine fisheries.

Ans: Marine fisheries involve catching fish from sea waters using boats, trawlers, and satellite-guided tools. Fish like tuna, sardines, pomfret, etc., are caught. Mariculture includes the farming of oysters and prawns in seawater.

15. Why is animal husbandry important in India?

Ans: (i) Provides milk, meat, eggs, and wool.

(ii) Enhances rural economy.

(iii) Reduces dependence on crop income alone.