Plant and Animal Cell: Important Points Cell was discovered by Robert Hooke in 1665. Cell is a structural and functional unit of living beings which consists of a membrane covered mass of protoplasm. Unicellular Organisms– Also called as acellular organisms. The body of the organism is made of a single cell. Example- Amoeba, Chlamydomonas, Paramecium,
Tissues: A group of cells having a similar structure and performing similar functions is called a tissue. Plant Tissues: Meristematic Tissues: It consists of rapidly dividing cells. These cells lead to rapid growth in the plant and are thus located in actively growing regions namely, the root tip and the shoot tip. This tissue keeps
Chemical Coordination in Plants: Plants do not have a nervous system but they coordinate their activities by means of some chemicals called the plant hormones or phytohormones. Depending upon the effect on plants growth, phytohormones have been grouped into the following categories- Growth Promoters – These are the phytohormones which stimulate the growth of
The nervous system receives information about external & internal changes, communicates the information to different parts of the body & coordinates the activities of the different organs & organ systems. The nervous system includes the following parts- brain, spinal cord, nerves & the five sense organs namely eyes, ears, nose, tongue & skin. Brain (Encephalon):
Components of Blood: Blood: Blood is an important fluid connective tissue & consists of two components – the fluid part called plasma & cells called formed elements. Formed elements are of three types – Red blood corpuscles, white blood corpuscles & blood platelets. Plasma: Plasma is a faint yellow coloured, homogenous, non-living, slightly alkaline viscous
Digestion Process: The process of digestion involves intake of the food (Ingestion), breakdown of the food into micromolecules (Digestion), absorption of these molecules into the blood stream (Absorption), the absorbed substances becoming components of cells (Assimilation) and elimination of the undigested substances (Egestion). Digestive system includes the alimentary canal and associated digestive glands. Alimentary Canal
Autotrophic & Heterotrophic Nutrition: Nutrition: Food is required by all the living beings to survive. Food contains various nutrients. The process by which the food is obtained and considered by living organism to get energy and various other materials for the growth, repair, development and maintenance of the various body parts is callednutrition. Modes or
