Question 8
What is the key difference between primary and secondary sewage treatment?
Answer
|
|
Primary sewage treatment |
|
Secondary sewage treatment |
|
1. |
It is a mechanical process involving the removal of coarse solid materials. |
1. |
It is a biological process involving the action of microbes. |
|
2. |
It is inexpensive and relatively less complicated. |
2. |
It is a very expensive and complicated process. |
Popular Questions of Class 12 Biology
- Q:- What is spermatogenesis? Briefly describe the process of spermatogenesis.
- Q:- Why is reproduction essential for organisms? Answer
- Q:- Write a short note on
(a) Adaptations of desert plants and animals
(b) Adaptations of plants to water scarcity
(c) Behavioural adaptations in animals
(d) Importance of light to plants
(e) Effect of temperature or water scarcity and the adaptations of animals. - Q:- With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte.
- Q:- What is DNA fingerprinting? Mention its application.
- Q:- What is oogenesis? Give a brief account of oogenesis.
- Q:- Describe the structure of a seminiferous tubule.
- Q:- What is triple fusion? Where and how does it take place? Name the nuclei involved in triple fusion.
- Q:- With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.
- Q:- Explain the Law of Dominance using a monohybrid cross.
Recently Viewed Questions of Class 12 Biology
- Q:- Distinguish between
(a) Grazing food chain and detritus food chain
(b) Production and decomposition
(c) Upright and inverted pyramid
(d) Food chain and Food web
(e) Litter and detritus
(f) Primary and secondary productivity - Q:- What is a bisexual flower? Collect five bisexual flowers from your neighborhood and with the help of your teacher find out their common and scientific names.
- Q:- A child has blood group O. If the father has blood group A and mother blood group B, work out the genotypes of the parents and the possible genotypes of the other offsprings.
- Q:- What are the various public health measures, which you would suggest as safeguard against infectious diseases?
- Q:- What is bagging technique? How is it useful in a plant breeding programme?
- Q:- Do you think that reproductive health in our country has improved in the past 50 years? If yes, mention some such areas of improvement.
- Q:- How is diapause different from hibernation?
- Q:- List the harmful effects caused by alcohol/drug abuse.
- Q:- Arrange the following terms in the correct developmental sequence:
- Q:- Using various resources such as your school library or the internet and discussions with your teacher, trace the evolutionary stages of any one animal say horse.
4 Comment(s) on this Question
Shreya awasthi
2019-12-11 06:57:49
Not properly answered
Ak
2018-09-15 00:59:07
Yoooo
kushal
2017-09-20 08:46:37
Thank you so much
Om Kumar Patra
2017-02-03 23:42:34
Thanks for this answer.
- NCERT Chapter