biology

Based on the manner of orientation to the main axis of plant and direction of sunlight, leaves in angiosperms can be divided into two types

Growth in plants happens in two stages first new cells are produced, secondly these cells expand via uptake of water by the vacuole. The division of cells doesn’t occur throughout the plant – but only in meristematic regions. Expansion, however, can occur anywhere. Thus, in any plant, there are regions containing young cells, maturing cells and matured cells that have lost the capacity to divide.

The plants whose seeds have only one cotyledon are called dicots. The structure of dicot root varies greatly from that of the monocots. By understanding the structure of dicot root and monocot root, we can make comparisons between them and distinguish them by studying them under a microscope. Visit this page to learn about monocot root.

Blood caries many chemicals, which have various functions. One group of chemicals is called antigens, which can stimulate the production of antibodies. Based on the presence or absence of blood antigens and antibodies, four groups A, B, AB and O are recognized in human body. Antigens are the proteins on the surface of red blood cells. Blood of one group contains antibodies in the plasma that reacts against the antigen on the cells of other groups.

Prokaryotic cells are different from eukaryotic cells in many different ways. These bases of differences are clearly mentioned in the following table. Basis of Difference Prokaryotic Cells Eukaryotic Cells

Charactersistics of White Blood Cells or Leucocytes Count – The number of leucocytes per microlitre of blood is called total leucocytecount (TLC). A normal adult human consists of 5,000–10,000/mm3 of blood. Rise in WBCs count is called leucocytosis. Increased TLC shows that there is acute bacterial infection.

Blood is the fluid in living organism that transports oxygen and nutrients to the cells in the body. It consists of Red Blood Cells(Erythrocytes), White Blood Cells(Leukocytes) and platelets (Thrombocytes). Platelets are the part of the blood that helps to prevent blood loss through wounds by forming clot and fight off infections. 1µl (microlitre) of blood contains

Prokaryotic Cell The simplest form of cell, prokaryotic cell is also the oldest form of life on the earth. Distinctively known for the cellular structure, prokaryotic cells are those which lack membrane-bound nucleus and other cell organelles. Structure of Prokaryotic Cell Microscopic in size, prokaryotic cells are as small as mitochondria in eukaryotic cells and have diameter ranging from 0.1-10µm.

Nervous tissue is made up of millions of nerve cells called neurons. The neurons are highly specialized cells which controls and co-ordinates the body activities and forms a system called Nervous system. Nervous system consists of three types such as CNS, PNS and ANS.

Prokaryotic cell is one of the simplest forms of cell which makes up the unicellular microscopic organisms called acrhaea and bacteria. However, there are some cyanobacteria which are multicellular.