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Good vision depends on adequate intake o...

Good vision depends on adequate intake of carotene rich food
Select the best option from the following statements
(A) Vitamin A derivatives are formed from carotene
(B) The photopigments are embedded in the membrane discs of the inner segment
( C) Retinal is a derivative of Vitamin A
(D) Retinal is a light absorbing part of all the visual photopigments

A

(A) and (B)

B

(A), ( C) and (D)

C

(A) and (C )

D

(B), ( C) and (D)

Text Solution

Verified by Experts

The correct Answer is:
B
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Good vision depends on adequate intake of carotene rich food. Select the best option from the following statements: (a) Vitamin A derivateves are formed from carotene (b) Photopigments are embedded in the membrane discs of inner segment(c ) Retinal is derivative of v itamin A (d) Retinal is a light absorbing part of all the visual pigments.

The steps involved in the mechanism of vision are given below. Arrange them in proper sequence and select the correct option. A. Dissociation of retinal from opsin and generation of potential difference in photoreceptor cells. B. Focusing of the light rays in visible wavelength on the corner through the lens. C. Generation of the action potential in ganglion cells through bipolar cells. D. Analysis of neural impulse and formation of aa image on the retina. E. Transmission of the action potential by the optic nerve to the visual cortex.

In the first biological applicativon of bucky ball , chemists at the University of Califorminaat San F Francisoc and Santa Barbra made a discovery in 1993 that could help I designing drugs to rtreat AIDS . The human immunodeficienrcy virus (HIV) that causes AIES reproduces by syntheising a long protein chain , which is cut into smaller segments by an enzymecalled HiV-proteases . ONe way to stop AIDS , then might be to inacivate the enzyme. when the chemists reacted a water-soluble derivative of bucky ball with HIV-protease , they found that itbinds to the portion of th enzyme that would ordinarily clareve the repreouctive protein , preventing the HIV virus from reproducing . Consequently the virus could no bnolgre infect the human cells they had frown in the laboratory . The buycky ball compound itself is not a suitable drug for use against AIDS because of potential side effects and delivery difficaultes , but it does provide a model for the development of such drugs Consider following statements about bucky ball : A , It is also called fullerene B: It is also called Buckministerfullerene C: Bucky tubes (made of fullerenes ) are several times stronger than stel whnires D: Bucky ball is a plastic polymer Select correct statement (s) :

The diagram shows the structure of a fungal cell with different parts labelled as A,B,C and D. Which of the following statements are true with regard to the fungal cell structive? (i) A contains mucopolysaccharides which are also present in exoskeleton of insects and crustaceans. (ii) D are usually more than one in number in case of aseptate hyphae. (iii) Carotenes and xanthophylls are present in C, which harvest light energy for photosynthesis. (iv) B is the reverse food material, usually stored in the form of starch and oil.

A list of steps involved in mechanism of vision is given below in a random order. (i)Neural impulses are analysed and image formed on retina is recognised by visual cortex. (ii)Membrane permeability changes (iii)Ganglion cells are excited (iv)Bipolar cells are depolarised (v)Action potentials (impulse) are transmitted by optic nerves to visual cortex. (vi)Potential differences are generated in the photoreceptor cells. (vii)Light energy causes a change in shape of rhodopsin, leading to the dissociation of retina (an aldehyde of vitamin A ) from opsin (a protein) (viii)Structure of opsin is changed. Which of the following options represents these events in a correct order ?

Consider the following four statemets (A - D) related to organic farming and select the correct option stating which ones are true (T) and which ones are false (F). The statements: (A) Produces food crops rich in lipids, vitamins and iron (B) Users biofertilisers which increases soil fertility (C ) There is more use of chemical fertilisers and pesticides (D) Raising unpolluted crops throuth the use of bacteria, fungi and cyanobacteria

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