What are cell wall ?
Plant cells are characterized by the presence of a rigid cell wall on the basis of which they can be differentiated from animal cells (Most animal cells are now known to possess a cell coat-which form a…
Archive | Biology
How do salt and sugar help in the preservation of fruits and vegetables ?
Salt and sugar are widely used for the preservation of fruits and vegetables. The presence of high concentration of salts (15% and 18%) drains out the water from food materials through osmosis and prevents…
What are ribosomes ?
Ribosomes are small globular particles of approximately 250Ao diameter and are nonmembranous. RNA and ribonucleoproteins are found in these in equal amounts. Robinson and Brown (1953) were…
What is plant physiology ?
Plant Physiology is the science which deals with the life processes of plants, or Plant Physiology is the science which deals with the functions of cells, tissues, organs or the plant as a whole…
What is the difference between breathing and respiration?
The difference between breathing and respiration are:
What is the difference between arteries and Veins ?
The difference between arteries and Veins are:
What is the difference between plant and animal cell ?
The difference between plant and animal cell are in plant cell, a rigid and nonliving cell wall is always present outside the plasmalemma whereas in animal cell, Cell wall absent…
What are the damages caused by acid rain ?
Acidic oxides present in the atmosphere cause acid rain. SO2 present in the atmosphere gets oxidizes to sulphur trioxide. The later reacts with water vapor present in the atmosphere to produce sulphuric acid…
Short Essay on Food Web
All food chains in a community constitute a food web. A food web is simply the total set of feeding relationship amongst and between the species composing a biotic community. These relationships…
What are the essential features of a good store for food-grains ?
Containers used for storage of different types of food material should be constructed as to provide protection against all possible cause of damage. This applies equally for commodities stored on a commercial…
What is mutation and what are its features ?
Mutations are sudden changes in genotype, involving qualitative and quantitative alterations in the genetic material itself which change the phenotype of an organism…
What is the difference between dry cell and Lead storage cell ?
The difference between dry cell and Lead storage cell are a dry cell once finished, cannot be charged again whereas Lead storage cell or accumulators once exhausted can be charged again and again…
What is cytoplasm ?
Cytoplasm is that part of the protoplasm which surrounds the nucleus and is itself surrounded by dead cell wall. Cytoplasm can be divided into the following parts…
What is scientific research and how the tax deductions are made ?
'Scientific Research' means any activity for the extension of knowledge in the, fields of natural or applied science including agriculture, animal husbandry or fisheries. Expenditure incurred on scientific research includes all…
What are vitamins and what are its types ?
Vitamins are organic compounds of diverse structure which are not used for energy or used into tissue framework but which are required in minute amounts for the normal functioning of living…
What is the difference between male sparrow and female sparrow ?
The difference between male sparrow and female sparrow are: