3 Reasons Why You Need Passport

If you are still wondering why you need the Passport All-in-One subscription for my exam preparation, this post might help.

Reason 1.
Everyone has doubts daily.
Only HashLearn Passport gives you unlimited 1-on-1 doubt solving. 24/7.

One doubt left neglected could make all the difference in securing a top rank.

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NCERT Class 12 Biology Complete Solutions

Here is the complete solution for NCERT Class 12 Biology presented chapter wise:

 Chapters  Topic Name
 Chapter 1  

 Reproduction in Organisms

 Chapter 2    Sexual Reproduction in Flowering Plants 
 Chapter 3    Human Reproduction
 Chapter 4    Reproductive Health
 Chapter 5    Principles of Inheritance and Variation
 Chapter 6    Molecular Basis of Inheritance 
 Chapter 7    Evolution
 Chapter 8    Human Health and Disease 
 Chapter 9    Strategies of Enhancement in Food Production 
 Chapter 10    Microbes in Human Welfare 
 Chapter 11    Biotechnology: Principles and Process  
 Chapter 12    Biotechnology and it’s Applications
 Chapter 13    Organism and Populations
 Chapter 14    Ecosystem 
 Chapter 15    Biodiversity and Conservation 
 Chapter 16    Environmental Issues 

 

 

 

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NCERT Class 12 Biology Solutions: Chapter 16 – Environmental Issues

What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river.

Solution:

Domestic sewage: It is the waste originating from the kitchen, toilet, laundry, and other sources. It contains impurities such as suspended solid (sand, salt, clay), colloidal material (fecal matter, bacteria, and cloth fiber), dissolved materials (nitrate, phosphate, calcium, sodium, ammonia), and disease-causing microbes.

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