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Medical
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Which one of the following hormones is not involved in sugar metabolism ?

  • Option 1)

    Aldosterone

  • Option 2)

    Insulin

  • Option 3)

    Glucagon

  • Option 4)

    Cortisone

 
  Cortisol - In our body, cortisol is the main glucocorticoid. - wherein Corticoids, which regulate the balance of water and electrolytes in our body are called mineralocorticoids. Aldosterone is the main mineralocorticoid in our body.     Aldosterone - Aldosterone acts mainly at the renal tubules and stimulates the reabsorption of Na+ and water and excretion of K+ and phosphate ions. -...
Medical
94 Views   |  

Which of the following joints would allow no movement ?

  • Option 1)

    Cartilaginous joint

  • Option 2)

    Synovial joint

  • Option 3)

    Ball and Socket joint

  • Option 4)


    Fibrous joint

 
  Fibrous joints - Fibrous joints do not allow any movement. - wherein This type of joint is shown by the flat skull bones which fuse end-to-end with the help of dense fibrous connective tissues in the form of sutures, to form the cranium.     Option 1) Cartilaginous joint This option is incorrect. Option 2) Synovial joint This option is incorrect. Option 3) Ball and Socket joint This option...
Medical
111 Views   |  

Which of the following is not a function of the skeletal system ?

  • Option 1)

    Storage of minerals

  • Option 2)

    Production of body heat

  • Option 3)

    Locomotion

  • Option 4)

    Production of erythrocytes

 
  SKELETAL SYSTEM - Skeletal system consists of a framework of bones and a few cartilages. - wherein This system has a significant role in movement shown by the body.    Production of Heat is not by skeleton system. It provides support for movement, store minerals  and production of blood cells(Bonemarrow). Option 1) Storage of minerals This option is incorrect Option 2) Production of body...
Medical
117 Views   |  

In mammalian eye, the 'fovea' is the center of the visual field, where:

  • Option 1)

    the optic nerve leaves the eye.

  • Option 2)

    only rods are present.

  • Option 3)

    more rods than cones are found.

  • Option 4)

    high density of cones occur, but has no rods.

 
  Fovea - At the posterior pole of the eye lateral to the blind spot, there is a yellowish pigmented spot called macula lutea with a central pit called the fovea. - wherein The fovea is a thinned-out portion of the retina where only the cones are densely packed. It is the point where the visual acuity (resolution) is the greatest.    Only cones are densely packed and rodes Hu are...
Medical
108 Views   |  

Which one of the following hormones though synthesised elsewhere, is stored and released by the master gland?

  • Option 1)

    Luteinizing hormone

  • Option 2)

    Prolactin

  • Option 3)

    Melanocyte stimulating hormone

  • Option 4)

    Antidiuretic hormone

 
  Vasopressin - Vasopressin acts mainly at the kidney and stimulates resorption of water and electrolytes by the distal tubules and thereby reduces loss of water through urine (diuresis) - wherein Hence, it is also called as anti-diuretic hormone (ADH).     Osmoreceptors - Osmoreceptors in the body are activated by changes in blood volume, body fluid volume and ionic concentration. - wherein An...
Medical
124 Views   |  

The primary dentition in human differs from permanent dentition in not having one of the following type of teeth :

  • Option 1)

    Premolars

  • Option 2)

    Molars

  • Option 3)

    Incisors

  • Option 4)

    Canine

 
  Decidous Teeth - In humans, first set of teeth are called the decodous teeth, which are 20 in number - wherein The dental formula is 2102/2102.  This means 2 incisors, 1 canine, 0 premolars, 2 molars    Premolars are absent 2102/2102 Option 1) Premolars This  is correct option Option 2) Molars This  is incorrect option Option 3) Incisors This  is incorrect option Option 4) Canine This  is...
Medical
266 Views   |  

Human urine is usually acidic because :

  • Option 1)

    excreted plasma proteins are acidic.

  • Option 2)

    potassium and sodium exchange generates acidity.

  • Option 3)

    hydrogen ions are actively secreted into the filtrate.

  • Option 4)

    the sodium transporter exchanges one hydrogen ion for each sodium ion, in peritubular capillaries.

 
As we learnt Characteristics of urine - An adult human excretes, on an average, 1 to 1.5 litres of urine per day. - wherein The urine formed is a light yellow coloured watery fluid which is slightly acidic (pH-6.0) and has a characterestic odour.    The pH of urine is 6.0 which is acidic due to secretion of H+ ions H+ is proportional to 1/pH (low pH -> High H+) Option 1) excreted plasma...
Medical
170 Views   |  

Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when :

  • Option 1)

    Ventricular walls vibrate due to gushing in of blood from atria

  • Option 2)

    Semilunar valves close down after the blood flows into vessels from ventricles

  • Option 3)

    AV node receives signal from SA node

  • Option 4)

    AV valves open up

 
As we learnt in  Lub-dub - During each cardiac cycle two prominent sounds are produced which can be easily heard through a stethoscope. - wherein The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves whereas the second heart sound (dub) is associated with the closure of the semilunar valves.    The second heart sound (dub) is associated with the closure...
Medical
173 Views   |  

A column of water within xylem vessels of tall trees does not break under its weight because of:

  • Option 1)

    Tensile strength of water

  • Option 2)

    Lignification of xylem vessels

  • Option 3)

    Positive root pressure

  • Option 4)

    Dissolved sugars in water

 
  Cohesion tension or transpirational pull theory - There is a continuous column of water from root through the stem and into leaves. Water molecules are attached with each other by cohesion force, and by walls of tracheary by adhesion force.  - wherein Given by Dixon and Jolly (1894).    Tensile strength of water is very high.   Option 1) Tensile strength of water Correct option Option...
Medical
261 Views   |  

Roots play insignificant role in absorption of water in:

  • Option 1)

    Pistia

  • Option 2)

    Pea

  • Option 3)

    Wheat

  • Option 4)

    Sunflower

 
As discussed in Rate of Water Absorption (R) - -     Rate of water absorption in the roots depends upon soil conditions. But Pistia is a hydrophytic plant and hence, roots have no significance in water absorption.  Option 1) Pistia This option is correct. Option 2) Pea This option is incorrect. Option 3) Wheat This option is incorrect. Option 4) Sunflower This option is incorrect.
Medical
101 Views   |  

In photosynthesis, the light-independent reactions take place at :

  • Option 1)

    Photosystem I

  • Option 2)

    Photosystem II

  • Option 3)

    Stromal matrix

  • Option 4)

    Thylakoid lumen

 
As discussed in Dark reaction of photosynthesis - Light independent stage, which utilize ATP and NADPH produced during light reaction to produce glucose.  - wherein Takes place in the stroma.    dark reaction in photosynthesis occurs in the stroma. Option 1) Photosystem I This option is incorrect. Option 2) Photosystem II This option is incorrect. Option 3) Stromal matrix This option is...
Medical
382 Views   |  

The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction ?

 

  • Option 1)

    Manganese and Potassium

  • Option 2)

    Magnesium and Molybdenum

  • Option 3)

    Magnesium and Chlorine

  • Option 4)

    Manganese and Chlorine

 
As learnt in Photolysis of water - Occurs in the lumen of thylakoid. Requires Mn+, Cl-, Ca2+ and oxygen evolving complex  - wherein e- move towards P680 of PSII and H+ accumulate in lumen and finally reduced to NADP    Photolysis of water requires Mn+, Cl- and Ca2+   Option 1) Manganese and Potassium Incorrect option Option 2) Magnesium and Molybdenum Incorrect option Option 3) Magnesium and...
Medical
276 Views   |  

Root pressure develops due to :

  • Option 1)

    Low osmotic potential in soil

  • Option 2)

    Passive absorption

  • Option 3)

    Increase in transpiration

  • Option 4)

    Active absorption

 
As learnt Root pressure theory - Due to movement of water from soil into the root hair and from there to xylem cells, a hydrostatic root pressure develops which pushes the water up in the xylem vessels. - wherein Given by Priestly (1916), the magnitude of pressure is too small for tall trees, hence present in only herbaceous plants.     Hydrostatic root pressure develop in the plant roots by...
Medical
162 Views   |  

Which one of the following fruits is parthenocarpic?

  • Option 1)

    Apple

  • Option 2)

    Jackfruit

  • Option 3)

    Banana

  • Option 4)

    Brinjal

 
As discussed in Concept Fruits - Fruit is matured or ripned ovary developed after fertilization. Afetr fertilization ovary forms fruits & ovules form the seeds. - wherein Pomology is the study of fruits. Some fruit do not contain seeds called pardhenocarpic or seedless fruits ex. banana, grapes, pineapple (fruits without fertilization)    Banana is parthenocarpic or seedless fruit Option...
Medical
120 Views   |  

The function of the gap junction is to :

  • Option 1)

    facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules.

  • Option 2)

    separate two cells from each other.

  • Option 3)

    stop substance from leaking across a tissue.

  • Option 4)

    performing cementing to keep neighbouring cells together.

 
As discussed in concept Gap Junction - Gap Junction - Connection of cytoplasma -     Option 1) facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules. Option is correct Option 2) separate two cells from each other. Option is incorrect Option 3) stop substance from leaking across a tissue. Option is...
Medical
438 Views   |  

The chitinous exoskeleton of arthropods is formed by the polymerisation of :

  • Option 1)

    D - glucosamine

  • Option 2)

    N - acetyl glucosamine

  • Option 3)

    lipoglycans

  • Option 4)

    keratin sulphate and chondroitin sulphate

 

THE CHITINOUS EXOSKELETON OF ARTHROPODS IS FORMED BY THE POLMERISATION OF N-ACETYL GLUCOSAMINE

 

Medical
469 Views   |  

The body cells in cockroach discharge their nitrogenous waste in the haemolymph mainly in the form of :

  • Option 1)

    Potassium urate

  • Option 2)

    Urea

  • Option 3)

    Calcium carbonate

  • Option 4)

    Ammonia

 
As discussed in Concept   Composition of hemocoel - Fat boides are present in hemocoel which are trophocytes, mycetocytes, oenocyte and Urate cells. - wherein Fat bodies of cockroach is analogous to liver of vertebrate. The body cell discharges their waste in the hemolymph in the form of potassium urate       Option 1) Potassium urate Option is correct Option 2) Urea Option is...
Medical
287 Views   |  

Read the different components from (a) to (d) in the list given below and tell the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem :

  1. Secondary cortex
  2. Wood
  3. Secondary phloem
  4. Phellem

The correct order is :

 

  • Option 1)

    (a),(b),(d),(c)

  • Option 2)

    (d),(a),(c),(b)

  • Option 3)

    (d),(c),(a),(b)

  • Option 4)

    (c),(d),(b),(a)

 
As discussed in Anatomy of Dicot Stems - In contains outer single layer called epidermis, convered by cuticle, bears trichomes (multicellular hairs). Epidermis lacks chloroplast. Cortex is divided into hypodermis, general cortex & endodermis. Pericycle is situated in between endodermis & vascular bundles. Vascular bundles (wedge shaped) are arranged in a ring. It is conjoint, collateral and...
Medical
141 Views   |  

Coconut water from a tender coconut is:

  • Option 1)

    Free nuclear endosperm

  • Option 2)

    Innermost layers of the seed coat

  • Option 3)

    Degenerated nucellus

  • Option 4)

    Immature embryo

 

1

Medical
107 Views   |  

Axile placentation is present in :

  • Option 1)

    Lemon

  • Option 2)

    Pea

  • Option 3)

    Argemone

  • Option 4)

    Dianthus

 
As discussed in Superficial placenta - Ovary is multilocular with many carpels, & placenta is axile type of placentation. - wherein Ex. water lily, it is most primitive    Axile placentation show axial ovules.  E.g. Lemon   Option 1) Lemon This solution is correct. Option 2) Pea This solution is incorrect. Option 3) Argemone This solution is incorrect. Option 4) Dianthus This solution is incorrect.
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