Natural Resources, NCERT Solutions, Class 9, Science Class 9 Notes | EduRev

Class 9 : Natural Resources, NCERT Solutions, Class 9, Science Class 9 Notes | EduRev

The document Natural Resources, NCERT Solutions, Class 9, Science Class 9 Notes | EduRev 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.

Offer running on EduRev: Apply code STAYHOME200 to get INR 200 off on our premium plan EduRev Infinity!

Related Searches

mock tests for examination

,

study material

,

Free

,

past year papers

,

NCERT Solutions

,

NCERT Solutions

,

Class 9

,

Science Class 9 Notes | EduRev

,

Science Class 9 Notes | EduRev

,

Objective type Questions

,

ppt

,

Natural Resources

,

Exam

,

Previous Year Questions with Solutions

,

NCERT Solutions

,

Class 9

,

Natural Resources

,

Important questions

,

video lectures

,

Summary

,

Sample Paper

,

Extra Questions

,

MCQs

,

pdf

,

Viva Questions

,

Semester Notes

,

Science Class 9 Notes | EduRev

,

shortcuts and tricks

,

Natural Resources

,

practice quizzes

,

Class 9

;