Improvement in Food Resources - NCERT Solution, Class 9 Science Notes - Class 9

Class 9: Improvement in Food Resources - NCERT Solution, Class 9 Science Notes - Class 9

The document Improvement in Food Resources - NCERT Solution, Class 9 Science Notes - Class 9 is a part of Class 9 category.
All you need of Class 9 at this link: Class 9

Class IX Science

Chapter 15 – Improvement in Food Resources 

Question 1:

How do biotic and abiotic factors affect crop production?

Answer:

A variety of biotic factors such as pests, nematodes, diseases, etc. can reduce the net crop production. A pest causes damage to agriculture by feeding on crops. For example, boll weevil is a pest on cotton. It attacks the cotton crop, thereby reducing its yield. Weeds also reduce crop productivity by competing with the main crop for nutrients, light, and space.

Similarly, abiotic factors such as salinity, temperature, etc. affect the net crop production. Some natural calamities such as droughts and floods are unpredictable. Their occurrence has a great impact on crops sometimes, destroying the entire crop.

 

Question 2:

What are the desirable agronomic characteristics for crop improvements?

Answer:

The desirable agronomic characteristics for crop improvements are:

(i) Tallness and profuse branching in any fodder crop.

(ii) Dwarfness in cereals.

These desirable agronomic characteristics help in increasing crop productivity.

Question 3:

What are macro-nutrients and why are they called macro-nutrients?

Answer:

Macro-nutrientsare nutrients required in relatively large quantities for growth and development of plants. They are six in number. Since they are required in large quantities, they are known as macro-nutrient. The six macro-nutrients required by plants are nitrogen, phosphorus, potassium, calcium, magnesium, and sulphur.

 

Question 4:

How do plants get nutrients?

Answer:

Plants require sixteen essential nutrients from nature for their growth and development. All these nutrients are obtained from air, water, and soil. Soil is the major source of nutrients. Thirteen of these nutrients are available from soil. The remaining three nutrients (carbon, oxygen, and hydrogen) are obtained from air and water.

The document Improvement in Food Resources - NCERT Solution, Class 9 Science Notes - Class 9 is a part of Class 9 category.
All you need of Class 9 at this link: Class 9

Download free EduRev App

Track your progress, build streaks, highlight & save important lessons and more!

Related Searches

ppt

,

Important questions

,

Objective type Questions

,

Improvement in Food Resources - NCERT Solution

,

Extra Questions

,

practice quizzes

,

past year papers

,

mock tests for examination

,

Exam

,

Summary

,

Class 9 Science Notes - Class 9

,

Semester Notes

,

Sample Paper

,

pdf

,

Improvement in Food Resources - NCERT Solution

,

Improvement in Food Resources - NCERT Solution

,

Class 9 Science Notes - Class 9

,

Viva Questions

,

Previous Year Questions with Solutions

,

Class 9 Science Notes - Class 9

,

shortcuts and tricks

,

video lectures

,

study material

,

MCQs

,

Free

;