Month: November 2020
Defences Against Diseases
The body has three main lines of defence against disease. These involve mechanical barriers, chemical barriers and cells. Mechanical barriers Although many bacteria live on the surface of the skin, the outer layer of the epidermis seems to act as a barrier that stops them getting into the body. But if the skin is cut…
Which of these cells are not a type of neuroglia found in the CNS
Option C: Schwann cell is the right answer. There are three types of glial cells in the mature central nervous system: astrocytes, oligodendrocytes, and microglial cells. Astrocytes, which are restricted to the brain and spinal cord, have elaborate local processes that give these cells a starlike appearance. The major function of astrocytes is to maintain, in a variety…
How do plants know when to flower?
Phytochrome, a blue-green pigment, is part of a switching mechanism for phototropic responses to light of red and far-red wavelengths. Its active form, Pfr might trigger the secretion of one or more hormones that induce and inhibit flowering at different times of yeat. The main environmental cue for flowering is the length of night, i.e.…
Sir Alexander Fleming
(August 6 , 1881 – March 11, 1955) Early life and Education Sir Alexander Fleming was a Scottish physician, microbiologist, and pharmacologist, who was born on August 6, 1881 at Lochfield farm near Darvel, in Ayrshire, Scotland. Alexander was the third of four children of farmer Hugh Fleming (1816–1888) from his second marriage to Grace…
Quiz On Transport in plant
