12th grade level books

Growth at the molecular level involves the synthesis of new molecul..

Each link in a food chain is known as a trophic level. For example, in each food chain, plants always form the first trophic level. The plant eating animals called herbivores like insects, rodents, rabbits, deer, cattle, etc. form the second trophic level. The animals..

Levels of Biodiversity - Biological diversity includes 3 hierarchical levels. a) Genetic diversity b) Species diversity c) Community and ecosystem diversi..

The molecules of various chemical substances in a specific proportion become organised into protoplasm - the physical basis of life. The protoplasm gets organised into cells, which represents the structural and functional unit of life. A living organism may have a single cell (unicellular) or many..

Growth at the cellular level involves four stages Cell expansion: an increase in the size of the cell due to formation of new protoplasm. Cell division: the cells increase in number due to mitotic cell division Cell differentiation: the cells became specialized to per form specific roles ..

Atoms of chemical elements combine with one another to form molecules. A molecule may have atoms of the same element (like O 2 , H 2 , N 2 ) or of different elements (like H 2 O, CO 2 , CH 4 etc..

Different types of tissue may together become organised into an organ for some specific function. E.g., a gland is an organ meant for secretion. In a gland there are four tissues - Epithelium (for secretion) Muscular tissue (for contraction of the gland) Connective tissue (for binding the ..

Number of books borrowed from a private library during a particular week is: Days Monday Tuesday Wednesday Thursday Friday Number of books 180 150 220 250 320 At significance level α = 0.05, find the chi-square test value and test the hypotheses whether the numbe..

Which measurement level has a true zero? => interval or ratio or ordinal or nominal..

Over the past 100 years, sea level has increases by 18 cm. Inter government a panel in climate change has suggested that sea level would rise upto 90cm by 2100. Large scale flooding of California in 1999 and parts of western coast in India in the last 5-8 years, are testimonies..