biology ch 9

Methane has capacity to mix with blood haemoglobin to form methamoglobin - which has no capacity to carry O 2 like normal haemoglobin. This reduces oxygen supply to body causing asphyxia. ..

According to this theory genetic mutations occur and accumulate with increasing age, causing cells to deteriorate and malfuncti..

It consists of a central axial filament, a thin layer of cytoplasm and an outer smooth plasma membrane. The axial filament is formed of 9 pairs of longitudinal fibres which extend upto the tip of the axial filament. In mammalian sperm, another set of nine thicker fibres is prese..

Among the members of the animal kingdom, about 95% do not posses a backbone (or vertebral column) and hence are described as invertebrates. The remaining animals represent a group called chordates, which posses a solid supporting structure on the dorsal side of the body called notochord, at some st..

Animal Diversity - Among the members of the animal kingdom, about 95% do not posses a backbone (or vertebral column) and hence are described as invertebrates. The remaining animals represent a group called chordates, which posses a solid supporting structure on the dorsal side of the body called no..

Chlorophyll pigments - chl.a - porphyrin head with CH 3 group and phytol chain. Chl.b - porphyrin head with CHO group and phytol chai..

Major Phyla of the Animal Kingdom - There are 10 major phyla in the animal kingdom from Protozoa to Chordata. Of these, phylum Protozoa is now placed in the kingdom Protista. The remaining nine phyla include true multicellular animals. Of these nearly 95% represent the invertebrates and a..

Animals can be broadly distinguished into two major groups the nonchordates (or invertebrates) and the chordates.Invertebrates account for more than 95% of the animal species that have been identified. These are animals which do not have a vertebral column or a back bone. They are distributed into ..

. Chlorophyll a has methyl group (-CH 3 ) at position and aldehyde (CHO) group in chlorophyll b. Chlorophyll a is the major pigment involved in trapping light energy and converting it in to electrical and chemical energy. It acts as a reaction centre. Chlorophyll b constitutes about 1/4 t..

With a considerable decrease in the earth's temperature over thousands of years, the atoms of different elements came together at random and formed inorganic molecules. Since the lighter elements (hydrogen, oxygen, carbon and nitrogen) were the most abundant in the outermost layer, their atoms reac..