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Question : At the metaphase plate during metaphase Il of meiosis, there are :

Question : At the end of repolarization, the nerve membrane gets hyperpplarized. Why ?

Question : At the end of digestion, fats are converted into .....

Question : At the base of each antenna of cockroach there is a small whitish spot. It is called

Question : At maturity, sieve tubes do not possess

Question : At least a half of the total CO_(2) fixation on earth is carried out by

Question : At high temperature, the enzymes stop functioning

Question : At higher CO_(2) concentration, oxveen dissociation curve of haemoglobin will

Question : At any given time there is more blood in the venoussystem than that of the arterial system. Which of the following features of the veins allows this ?

Question :Asymmetric shape of spindle is observed during:

Question : Asymmetry in gastropoda is due to…………………. .

Question : Asthma is caused due to

Question : Asthma may be attributed to

Question : Asterias: Star fish :: Pristis : ………..

Question : Assume that a pencil box held in your hand, represents a plant cell. In how many possible planes can it be cut ? Indicate these cuts with the help of line drawing.

Question : Association between mycobiont and phycobiont are found in (A) mycorrhiza (B) root (C) lichens (D) BGA

Question : Associate the following features with groups in which they first appeared. (a)Vascular tissues (b) Seeds inside fruits (c) Heterospore production

Question : Assign the following features of animals given in 'column A'to the most appropriate animal phylum given in 'column B'

Question : Assertion:When all the three types of cones are stimulated equally, a mosaic of red, green and blue lights is produced. Reason:conesare responsible for twilight or scotopic vision.

Question : Assertion:Vestibular apparatus helps us in maintaining balance of body and posture. Reason:Due to the arrangement of semicircular canals of vestibular apparatus, movement of head in any direction will stimulate sensory cells to maintain dynamic equilibrium.

Question : Assertion:This PNS comprises of all the nerves of the body associated with CNS. Reason:PNS is the site of information processing and control.

Question : Assertion:The resting membrane of the neuron exhibits polarity of charges Reason:The outer surface of the axonal membrane possesses a negative charge while its inner surface becomes positively charged.

Question : Assertion:The space between the cornea and the lens is called the vitreous chamber. Reason:The space between the lens and retina is called the aqueous chamber.

Question : Assertion:The inner ear contains three ossicles (malleus, incus and stapes) which are attached to one another in a chain-like fashion. Reason:The stapes is attached to the tympanic membrane and the malleus is attached to the oval window of the cochlea.

Question : Assertion:Reflex arc comprises of at least one afferent neuron, one efferent neuron and a part of PNS. Reason:The efferent neuron receivers signal from a sensory organ and transmits the impulse via a ventral nerve root into the PNS.

Question : Assertion:The Eustachian tube helps in equalising the pressures on either sides of the ear drum. Reason:The Eustachian tube connects the middle ear cavity with the pharynx.

Question : Assertion:Myelinated nerve fibres are present in spinal and cranial nerves. Reason:Myelinated nerves conduct impulses more radidly than unmyelinated nerves.

Question : Assertion:Multipolar neurons have two or more axons and one dendrite Reason:Multipolar neurons are found usually in the embryonic stage.

Question : Assertion:Medulla contains centres which control respiration, cardiovascular reflexes and gastric secretions. Reason:Medulla contains several neurosecretory cells which secrete hormones.

Question : Assertion:Electrical synapses are rare in our system. Reason:Impulse transmission across an electrical synapse is slower than that across a chemical synapse.

Question : Assertion:Choroid layer is thick over the posterior two-third of the eye ball but it becomes thin in the anterior part. Reason:Choroid layer lacks blood vessels It forms ciliary body in the anterior part of the eye ball.

Question : Assertion:At fovea, the visual acuity is the greatest. Reason:The fovea is a thick area of the retina where both rods and cones are present.

Question : Assertion:Association areas are neither clearly sensory nor motor in function. Reason:Association areas are responsible for complex functions like intersensory associations, memory and communication.

Question : Assertion : Yeast is more suitable for production of interferons. Reason : E.coli does not have the mechanism for glycosylation of proteins.

Question : Assertion Xylem tracheids are dead and lignified even then they allow movement of water form cell to cell Reason Xylem tracheids possess ptis and cell to cell movement of water occurs through them

Question : Assertion. White rat has pink eyes. Reason. White rat is a genetic mutation of brown rat.

Question : Assertion: With few exceptions, tropics harbour more species than temperate or polar areas. Reason: Species diversity decreases as we move away from the equator towards the poles.

Question : Assertion: When there is a fall in the blood pressure due to loss of blood volume, this is compensated by vasoconstiction of veins. Reason: Veins hold the extra amount of blood which can be shifted to the arteries as required.

Question : Assertion : When plant cells are placed in highly concentrated sugar or salt solution, they get plasmolysed.Reason : Highly concentrated sugar or salt acts as hypotonic solution which leads to exosmosis.

Question : Assertion: When cation uptake exceeds anion uptake, certain changes occur in the ionic composition of cell. Reasoning: H_(2)O and organic acids produced within cell dissociate and H^(+) move outside the cell.

Question : Assertion : When CO_(2) concentration of atmosphere increases, stomata close partially.Reason : CO_(2) combines with water to form carbonic acid which lowers pH value ans stomata close.

Question : Assertion : Vocal cords consists of three pairs of mucous membrane that extend into the lumen of the larynx. Reason : Sound is produced by only two pairs of cords.

Question : Assertion : Whale has a thick layer of fat, called blubber, below its skin. Reason: It uses this fat as the source of energy when deep in water.

Question : Assertion: Visceral muscles are smooth in appearance. Reason: Many muscle cells assemble in a branching pattern to from a visceral muscle.

Question : Assertion : Viruses are not included in any system of classification. Reason : Viruses are non-living but devlop living characters like multiplication etc. when they come in contact with suitablehost.

Question : Assertion. Vessels are made upof row of cells placed one above the another with their intervening walls (septa) absent due to dissolution. Reason. Sieve tubes are tubular channels. In tracheids walls are thick.

Question : Assertion : Very low temperature causes permanent denaturation of enzymes. Reason : Very low temperature breaks the disulphide bonds of enzymes.

Question : Assertion : Vasopressin of posterior pituitary is also called anti-diuretic hormone. Reason : ADH increases the permeability of PCT and collecting tubules to increase reabsorption of water-and decrease the urine output.

Question : Assertion: Vasa recta is absent or highly reduced in cortical nephrons. Reason: Cortical nephrons are mainly concerned with concentration of urine.