biology for grade 7

In certain parts of India, forests are burnt and the ash is mixed with the soil and the land used for cultivatio..

According to this theory, cells and tissues have vital parts that wear out resulting in ageing. DNA undergoes continual damage throughout life, due to various reasons. DNA damage leads to malfunctioning of genes, proteins, cells and deterioration of tissues and organs. An animals ability to repair ..

PSI PSII Is located on the outer surface of non appressed parts of grana thylakoids & tret channels. Is located on the inner surface of appressed parts of grana thylakoids. Comprises of about 200 - 400 chlorophylls, 50 carotenoids, one molecules of P 700 Comprises of about..

Mendel could not note linkage because of the seven characters be studied in garden pea, most of them are located in different (non-homologous) chromosomes seed colour and flower colour are in the same chromosome i.e, they are linked. However, they lie so far apart that they get separated ..

Mammals exhibit the following unique features also. Presence of mammary glands to nourish the young ones. Presence of muscular diaphragm that separates thorax from abdomen. Presence of external ear called pinna. Presence of seven vertebrae in the neck region. fig. 10.28 - Fish Anat..

This group includes angiosperms in which the seed bears only one cotyledon. The leaves exhibit parallel venation. It is divided into the following seven series. Microspermae: Ovary is inferior, seeds are minute and non-endospermic. Epigynae: Ovary inferior, seeds are large and endos..

Classification of food - On the basis of nutrients food can be classified into seven different groups: Carbohydrates Proteins Fats Vitamins Minerals Roughage Water Table 3. Composition of some common foods Food Carbohydrate Fat Protein Bread (Chapathi) Rice(cooked) Banana Apple Egg Milk B..

The ribs are curved bars, which movably articulate with the thoracic vertebrae at the back and unite with the sternum in front, all collectively forming a bony cage, the thoracic basket. There are twelve pairs of ribs. The upper seven is directly attached to the sternum in front. These a..

. Each phylum or division has the next taxon called Class . The members of each class exhibit certain distinguishing characters that are unique only to them. In the same way, using comparable criteria of similarities and relationships, each class can be divided into orders , each order into familie..

This originally belongs to Punjab and Haryana. The average yield of milk is 1800 to 2500 litres with 7% fa..