1. what is cell wall ? give its role in the cell body ?
2. what is migration ? why do the birds migrate from one country to another ?
3. define the term irrigation ? list different method of irrigation?
4. explain different steps of WWTP ( waste water treatment)
Answers
Answer:
1.cell wall is the outer layer of plant cell made up of cellulose. It help in preventing of foreign material into the cell.
2.Movement of animals from one place to another for breeding or for survival. They migrate from one place to another due to climatic changes and for breding
Answer:
1)
A cell wall is a structural layer surrounding some types of cells, just outside the cell membrane. It can be tough, flexible, and sometimes rigid. It provides the cell with both structural support and protection, and also acts as a filtering mechanism.
2) Bird migration is the regular seasonal movement, often north and south along a flyway, between breeding and wintering grounds. Migration carries high costs in predation and mortality, including from hunting by humans, and is driven primarily by availability of food. It occurs mainly in the northern hemisphere, where birds are funneled on to specific routes by natural barriers such as the Mediterranean Sea or the Caribbean Sea.
3) the artificial supply of water is known as irrigation (i) surface (ii) drip irrigation (iii) sprinkle irrigation (iv) subsurface irrigation
4)(I)Wastewater Collection. This is the first step in the wastewater treatment process.
(ii)Odor Control.
(iii)Screening.
(iv)Primary Treatment.
(v)Secondary Treatment.
(vi)Bio-solids handling.
(vii)Tertiary treatment.
(viii)Disinfection.