Introduction Animal inhabiting the aerial environment show many Volant (flying) adaptation for the aerial mode of existence. These animals are known as volant forms. Fishes, amphibians, reptiles, birds and mammals among vertebrates, and insects among invertebrates exhibit volant adaptations. Flight is of two types: i) active or true flight b) passive flight or gliding. A) … Read more
S.N Prokaryotic cell Eukaryotic cell 1. An organized nucleus is absent. An organized nucleus is present. 2. Nucleus is represented by packed mass of DNA fibres, which lacks nuclear membrane and nucleoli. It contains chromatin network, nuclear membrane and nucleoli. 3. DNA is naked i.e. it lacks protein association. DNA is covered with histone proteins … Read more
Physical sciences are governed by a set of laws, such laws are rigid and show no deviations or exceptions. But, biology is a science of life. It deals with living organisms. The living organisms show enormous variations and are capable of change. Therefore, the laws of physical and chemical phenomena associated with life processes show … Read more
Evolution is a process by which living things change over time and adapt to the conditions of their environment. It may be also defined as the gradual development of the characteristics of plants and animals over time. Everything in this world changes continuously through space and time. Changes relate to plants and animals (living organisms) … Read more
DNA contains a code which dictates the sequence in which amino acids are to be linked together to make a protein. The sequence of bases in a gene is a code for the sequence of amino acids in a protein. This relationship of nucleotide bases of a gene and the amino acids is known as … Read more
1. Apiculture The rearing of bees especially for commercial purposes. 2. Agronomy Branch of agricultural science which deals with the study of crops and soils. 3. Forestry The science or practice of planting, caring, and managing forests. 4. Agriculture The science of practice of cultivating the land and improving the crops. 5. Horticulture Practice of … Read more
S.N Apes Man 1. They have small brain box ranging from 395 cc (Orangutan); 400 cc (Chimpanzee) to 520 cc (Gorilla). Man has a large brain box 1200-1400 cc. 2. Occipital condyles posterior. Occipital condyles anterior. 3 Have a semi erect posture. Has a fully erect posture. 4. The backbone forms a simple curving arch. … Read more
1. Morphology Study of external form and structure of living organisms. 2. Anatomy Study of internal structure of plants and animals. 3. Histology Study of details of tissue structure of organisms. 4. Cell biology Study of structure, functions, reproduction and life history of cell. 5. Molecular biology Study of physio-chemical organization of biomolecules. 6. Physiology … Read more
S.N RBC WBC 1. RBC stands for red blood cells. WBC stands for white blood cells. 2. They are also known as erythrocytes. They are also known as leucocytes. 3. They are small biconcave and non nucleated. They are comparatively larger, amoeboid and nucleated 4. Much more in number. Much less in number. 5. Around … Read more
Organisms obtain their food materials in different ways which are of two types generally. They are: A) Autotrophic nutrition B) Heterotrophic nutrition. A) Autotrophic nutrition Gr.autos=self, trophein=to nourish. Also known as holophytic. In this type, organisms synthesize their own nutrients from inorganic constituents of the environment. Typically found in all … Read more