Advertisements
Advertisements
Question
Algal blooms impart a distinct colour to water due to ______.
Options
their pigments
excretion of coloured substances
formation of coloured chemicals in water facilitated by physiological degradation of algae
absorption of light by algal cell wall
Solution
Algal blooms impart a distinct colour to water due to their pigments.
APPEARS IN
RELATED QUESTIONS
What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river.
Public all over India is very much concerned about the deteriorating air quality in large parts of North India. Alarmed by this situation the Resident's Welfare Association of your locality organized an awareness programme entitled "Bury not burn". They invited you, being a biology student to participate.
(a) How would you justify your arguments that promote burying and discourage burning? (Give two reasons)
(b) With the help of flow charts, one for each practice depict the chain of events that follow.
A high Biological oxygen demand (BOD) indicates that ______.
The polluting strength of sewage is usually characterized by its ______.
World’s most problematic aquatic weed is ______.
What is cultural eutrophication?
What is an algal bloom?
Is it true that if the dissolved oxygen level drops to zero, the water will become septic. Give an example which could lower the dissolved oxygen content of an aquatic body.
How has DDT caused decline in bird population?
Observe figure and answer the following questions.
Biomagnification of DDT in an aquatic food chain
- What ecological term is used to describe the DDT accumulation at different trophic levels?
- List any one effect of DDT accumulation on birds
- Will DDT accumulation lead to eutrophication?
- Does it affect the BOD?
- Name disease caused by accumulation of any heavy metal.