internal or external division

Systematic Position - Kingdom : Metazoa Subkingdom: Eumetazoa Division : Bilateria Grade : Eucoelomata Phylum : Arthopoda Class : Insecta Order : Orthoptera Family : Blattidae Genus : Periplaneta Species : america..

. valvate b. imbricate c. quincuncial d. twisted e. vexillary d) Imbricate : Here one petal or sepal is outside (external) and one is inside(internal) and remaining three petals are overlapping as in twisted aestivation. There are 3 types of imbricate aestivation. 1. Ascendingly..

It is defined as the ratio of the net external work done by the engine during one cycle to the heat absorbed from the source during that cycle. It is denoted by h . The work W obtained in each cycle is called the output while the heat Q 1 extracted from the source in one cycle is called t..

Fertilisation - As a result of copulation, semen containing sperms is ejaculated into the vagina. Once the semen (mixture of spermatozoa and accessory fluids) is deposited into the vaginal passage of the female, the spermatozoa start their journey through the uterus to reach the oviducts. On an ave..

Summary - While the nervous system and endocrine system have their own features, they have a common method of communication. Both the systems release chemicals to communicate between cells. Together these two systems carry out a very complex process of maintaining a homeostatic (balanced) inte..

In case of plants, growth and development is in a coordinated manner. The higher plants do not show locomotion. However, locomotion is seen in structures like sperm cells of ferns and mosses that swim towards the egg. The other movements shown by the plants are associated with the growth of the pla..

. In the presence of an external electric field, the molecules align in the direction of the electric field, and is complete when working at a low temperature and stronger electric field. The "Non-polar" is that molecule in which the centre of gravity of protons (positive charge..

If i) r>0, C divides internally. ii) r<0, C divides externally..

p and C v When the temperature of 1 mol of ideal gas is to be raised through one degree (1 K) the gas is heated at constant volume. The gas under this condition does no external work and the heat supplied increases the internal energy of the gas. When the gas is heated..

. Classical branches largely provide knowledge in the respective areas of study. Some classical branches include Taxonomy (classification), Morphology (study of external form), Anatomy (study of internal structure), Histology (study of tissues), Cell Biology (Study of cells) etc..