biology activities for elementary

Mitochondria are tiny structures that occur in varying shapes cylindrical, spherical, oval, rod shaped etc. They are found distributed all over the cytoplasm. fig. 16.6 - Mitochondria Each mitochondrion is bound by a double membrane. The outer membrane is smooth and straight, while the inner membra..

Visit an agricultural institute where hybridization is done and study how Plants are grown in artificial conditions. Artificial cross-pollination is done. Tissue culture is done..

Photosynthesis - Some Activities - Following are some simple activities and experiments related to photosynthes..

Active Absorption - Movement of ions from the outer space of the cell to the inner space is generally against the concentration gradient and hence requires energy. This energy is obtained through metabolism either directly or indirectly. Various evidences indicate the active upt..

Immunity is said to be active when an organisms own cells produce antibodies. It develops as a result of contact with pathogenic organisms or their products. It may be acquired naturally or artificially. Active immunity is produced naturally by the attack of the disease like sma..

The penetration of the sperm activates the egg and initiates a series of changes in the egg cortex and in the egg cytoplasm. Ovulation in the human female occurs at the secondary oocyte stage in which meiosis - I has been completed and the first polar body has been released but second mei..

Movement of ions from the outer space of the cell to the inner space is generally against the concentration gradient and hence requires energy. This energy is obtained through metabolism either directly or indirectly. Various evidences indicate the active uptake of ions by carrier mechani..

Active immunity develops as a result of the contact of an individual with pathogenic organisms or their products. They stimulate the body to produce antibodies in response to the antigens. The immunity thus produced is specific for a particular disease. For e.g., the immunity established ..

This process is much faster and requires energy. A membrane pump operates across the cell membranes which transports the nutrients from the lumen of the intestine into the cells. This transport occurs with the help of ATP molecules. The carrier proteins in the membrane act as ATPases and hydrolyse..