Protein present in silk fibre is
Silk fibre is formed of two proteins namely fibroin and sericin.
Movements by pseudopodia of Amoeba are due to change in
Sol- gel theory of amoeboid movement was first given by Hyman, later supported by Pantin (1923) and Mast (1926). According to this theory, amoeboid locomotion is due to change in the viscosity of cytoplasm.
Solenocytes are associated with
Solenocytes or flame cells are the excretory organs of Phylum- Platyhelminthes.
Moulting hormone is secreted by
Prothoracic gland is also known as moult gland in some arthropods and Y organ or ventral gland in crustaceans. It secretes moulting hormone called ecdysone or ecdysome, which is steroid and stimulates moulting or ecdysis during metamorphosis in insects.
The cavity of diencephalon is known as
Diencephalon is located between cerebral hemispheres above and midbrain below. Its cavity is known as the third ventricle or diocoel. It is connected to each lateral ventricle of cerebral hemisphere by foramen of Monro, seperately.
In sea anemone, the symmetry is
In radial symmetry, body is divided into two similar halves by more than two planes passing through the main axis.
Cnidarians or coelenterates such as Hydra, sea anemone, Aurelia, Obelia etc are radially symmetrical animals with cell- tissue grade of body organizations.
Compond squamous epithelium is found in
In the structure of compound squamous epithelium, several layers of cells, deep layers are cuboidal to columnar, surface layers flat and scale- like.
It is found in mouth, oesophagus, part of epiglottis (pharynx) and vagina. The main function of this epithelium is protection.
From outer to inside the sequence of three bones present in the middle ear of mammals is
malleus, stapes and incus
stapes, malleus and incus
malleus, incus and stapes
incus, malleus and stapes
malleus, incus and stapes
The middle ear cavity in mammals characteristically contains a chain of three little bones or ear ossicles extending between the tympanic membrane and the fenestra ovalis. These are called malleus (hammer), incus (anvil) and stapes (stirrup) because of their characteristic shapes.
Which vitamin should not be stored?
Vitamin- C (ascorbic acid) has virucidal property. It is water soluble vitamin, ie, it dissolves in water and its excess amount is excreted in urine.
The reabsorption of water in the kidney is under the control of
Antidiuretic hormone (ADH) controls the tubular permeability and concentration of sodium in the extracellular fluid. It regulates the osmotic pressure of body fluids by causing the kidneys to increase water reabsorption.
It associates with the renal pressure system and then regulates the fluid volume of body through the agency of hypothalamic osmoreceptors.