Home
Class 11
BIOLOGY
Polluted water bodies have usually very ...

Polluted water bodies have usually very high abundance of plants like Nostoc and Oscillitoria. Give reasons. 

Text Solution

Verified by Experts

Some cynobacteria or blue green algae like Nostoc and Oscillitoria can tolerate adverse conditions including pollutants very well as compared to other aquatic plants. This is due to the presence of mucilage covering, resistant proteins and absence of sap vacuoles. They release large quantity of spores which are always remain present in air. These organisms get plenty of nutrients in polluted water. Hence, they often bloom in such conditions and are found in abundance in polluted water.
Promotional Banner

Topper's Solved these Questions

  • BIOLOGICAL CLASSIFICATION

    KUMAR PRAKASHAN|Exercise SECTION - E (SOLUTION OF NCERT EXEMPLAR)(SHORT ANSWER TYPE QUESTIONS )|5 Videos

  • BIOLOGICAL CLASSIFICATION

    KUMAR PRAKASHAN|Exercise QUESTIONS FROM MODULE (IMPORTANT MCQ FOR NEET)|2 Videos

  • BIOLOGICAL CLASSIFICATION

    KUMAR PRAKASHAN|Exercise SECTION - E (SOLUTION OF NCERT EXEMPLAR)(MULTIPLE CHOICE QUESTIONS : (MCQs))|12 Videos

  • ANIMAL KINGDOM

    KUMAR PRAKASHAN|Exercise OBJECTIVE SECTION (FILL IN THE BLANKS)|10 Videos

  • BIOMOLECULES

    KUMAR PRAKASHAN|Exercise QUESTION PAPER (DESCRIBE IN DETAIL):|1 Videos

Similar Questions

Explore conceptually related problems

It is very difficult to get rid of Eichhornia from the water body. Give reasons.

If two glass plates have water between them and are separated by very small distance (see figure). It is very difficult to pull them apart. It is because the water in between forms cylindrical surface on the side that gives rise ot lower pressure in the water in comparison to atmosphere. If the radius of the cylindrical surface is R and surface tension of water is T then the pressure in water between the plates is lowr by:

Explain why : (a) a body with large reflectivity is a poor emitter (b) a brass tumbler feels much colder than a wooden tray on a chilly day (c) an optical pyrometer (for measuring high temperatures calibrated for an ideal black body radiation gives too low a value for the temperature of a red hot Iron plece in the open, but gives a correct value for the temperature when the same plece is in the fumace (d) the earth without its atmosphere would be inhospitably cold (e) heating systems based on circulation of steam are more efficient in warming a building than those based on circulation of hot water

(a) With the help of well-labelled diagrams, describe the process of plasmolysis in plants, giving appropriate examples. (b) Explain what will happen to a plant cell if it is kept in a solution having higher water potential.

In a nuclear reactor a neutron of high speed (typically 10^(7) ms^(-1) ) must be slowed to of interacting with isotope ._(92)^(235)U and causing it to fission . Show that a neutron can lose most of its kinetic energy in an elastic collision with a light nuclei like deuterium or carbon which has a mass of only a few times the neutron mass . the material making up the light nuclei , usually heavy water (D_(2)O) or graphite is called a moderator .