Structure of Stem (Parts of Stem)
sanaThe internal structure of the stem is more complex. Stem is differentiated into nodes and internodes. The leaves are inserted on the nodes. The arrangement of leaves on the 'nodes…
BASIDIOMYCOTAi
abidaTYPE 1: USTILAGO (Smut) Occurrence Usti.ago is parasite on the grasses like wheat. It is commonly called smut. It attacks on the ovaries of grasses. Sometimes, it completely destoy the…
What animals possess a median eye?
rubabVision is the dominant sense in most reptiles, and their eyes are similar to those of amphibians. Upper and lower eyelids, a nictitating membrane, and a blood sinus protect and…
PHYLLACTINIA (Only for B.S.)
Scientific classification Kingdom: Fungi Phylum: Ascomvcota Class: Leotionmetes Subclass: Leotiomvcetidae Order: Erysinhales Family: Ervsimhaceae Genus: Phyllactinia Occurrence There are number of species of genus Phyllactinia. P. dalbergiae is commonest…
Describe the structure of vertebrate eye.
All vertebrates possess complex camera eyes. A camera-type eye contains in the front a light-tight chamber and lens system, which focuses an image of the visual field on a light…
Write a note on mechanoreceptors (tactile receptors) in the skin
Many animals rely on tactile (pertaining to touch) stimuli to obtain information about their environment. Mechanical sensory receptors in vertebrate skin detect stimuli that the brain interprets as light touch,…
Phylum Nematoda (nemtuos, thread) features & reproductive system
saadiaPHYLUM NEMATODA (nemtuos, thread) Nematodes are roundworms. They are some of the most abundant animals on earth. Number or round worm species is from 16, 000 to 500,000. There are…
Secondary Growth of Root
The roots increase in thickness by the formation of secondary vascular tissues. The secondary vascular tissues are produced by the activity of the vascular cambium. It produces the secondary xylem…
Structure of human ear and process of hearing and equilibrium in man
Structure of human ear The human ear has three divisions: the outer, middle, and inner ear. The outer ear consists of the auricle and external auditory canal. The middle ear…
TYPE 3: ALTERNARIA
Occurrence AItemaria is a very common saprophytic fungus. It decomposes the dead part of the plants. A few species of Altemaria can attack on living tissues. Alternaria causes diseases in…