biology for grade 7

Cyclostomata Chondrichthyes Osteichthyes Amphibia Reptilia Aves Mammali..

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

Laxity on the part of the officials in the enforcement of wild life protection acts is a major reason for the decreasing wild life of our countr..

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 ..

="center"> 6 * 95 5. Milk and Meat ½ Cup 75 6 Nil 3.5 7.5 4.0 6.0 65 85 6. Fat and Sugar 10 10 Nil 10 Nil Nil 10.0 Nil 90 ..

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..

The tarsal bones are seven in number and are collectively known as tarsus. They are short bones made up of cancellous bone tissue, with a covering of compact tissue. These bones support the weight of the body while standin..

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 ..

All the genes located on a particular chromosome, form a linkage group. Since the genes present on a particular chromosome have their alleles located on its homologous chromosome, genes on a pair of homologous chromosomes. Hence, the number of linkage groups corresponds to the number of haploid chr..

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..