biology life cycles

Water is an indispensable commodity of life. Water determines the distribution, structure and function of organisms in the ecosyste..

Water is an indispensable commodity of life. Water determines the distribution, structure and function of organisms in the ecosystem. Water occurs in three phases - solid, liquid (ice/snow) and gaseous (water vapour). In liquid phase it is vital for the existence of life on this..

Earth is the source of matter for all living organisms, as they require several (about 40) elements for their growth and life processe..

Oxygen is another essential element for living organisms. It is present in large quantities (20.95% v/v) in the atmosphere and is also seen in bound state in water and as oxides and carbonates in rocks. Dissolved oxygen in water is the source of oxygen for aquatic organisms. Oxygen in the Ozone lay..

There are two overlapping water cycles operating in nature. 1) Global water cycle 2) Biological water cycle. Global water cycle does not involve life. Water evaporates from water bodies like seas and oceans (more than 75% of total evaporat..

Menstruation and Menstrual Cycle - At about the age of 10 to 13 years, the ovaries of females are stimulated by the follicle stimulating hormone (FSH) of the pituitary. This is called the onset of puberty and is accompanied by release of hormones oestrogen and progesterone. These hormones..

>Use of natural insecticides such as neem (Azardactiva indica) based products like neem oil, neem cake, neem extract etc. Products like pyrethrum (from chrysanthamum) and nicotine (from nicotiana fabaccum) are also useful as biopesticides. Use of hormones or sterilants to interfere in the insect ..

Ecological Adaptations - Xerophytes - These are plants adapted to grow in dry habitats. They are classified into three categories on the basis of their morphology and life - cycle patte..

Death - Death is the final termination of the life activities. Every living organism has a life cycle involving its birth, growth and death. The duration of life between the birth and death of an organism, represents its life span. This ranges from ..

These are protozoans which occur as endoparasites in different groups of animals. They lack locomotor structures. The body has a tough covering called cuticle and a single nucleus. Asexual reproduction occurs by multiple fission. Sexual reproduction involves anisogamy. Life cycle..