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Engineering
141 Views   |  

Which part of the human ear plays no role in hearing as such but is otherwise very much required?

  • Option 1)

    Eustachian tube

  • Option 2)

    Organ of corti

  • Option 3)

    Vestibular apparatus

  • Option 4)

    Ear ossicles

 
@13457      Vestibular apparatus - The inner ear also contains a complex system called vestibular apparatus, located above the cochlea. - wherein The vestibular apparatus is composed of three semi-circular canals and the otolith (macula is the sensory part of saccule and utricle). Each semi-circular canal lies in a different plane at right angles to each other. The membranous canals are...
Engineering
144 Views   |  

Which one of the following pairs of hormones are the examples of those that can easily pass through the cell membrane of the target cell and bind to a receptor inside it (Mostly in the nucleus)

  • Option 1)

    Insulin, glucagon

  • Option 2)

    Thyroxin, insulin

  • Option 3)

    Somatostain, oxytocin

  • Option 4)

    Cortisol, testosterone

 
  intracellular receptors - Hormones which interact with intracellular receptors (e.g., steroid hormones, iodothyronines, etc.) mostly regulate gene expression or chromosome function by the interaction of hormone-receptor complex with the genome.  - wherein Cumulative biochemical actions result in physiological and developmental effects.     Cortisol and Testosterone are steroid hormones have...
Engineering
288 Views   |  

Which one of the following is the correct statement for respiration in human?

  • Option 1)

    Cigarette smoking may lead of inflammation of bronchi

  • Option 2)

    Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration

  • Option 3)

    Workers in grinding and stone - breaking industries may suffer, from lung fibrosis

  • Option 4)

    About 90%of carbon dioxide (CO2) is carried by haemoglobin as carbamino haemoglobin

 
As we learnt in  DISORDERS OF RESPIRATORY SYSTEM - Occupational Respiratory Disorders - wherein In certain industries, especially those involving grinding or stone-breaking, so much dust is produced that the defense mechanism of the body cannot fully cope with the situation. Long exposure can give rise to inflammation leading to fibrosis (proliferation of fibrous tissues) and thus causing...
Engineering
208 Views   |  

What is correct to say about the hormone action in humans?

  • Option 1)

    Glucagon is secreted by \beta -cells of Islets of Langerhans and stimulates glycogenolysis

  • Option 2)

    Secretion of thymosins is stimulated with aging

  • Option 3)

    In females FSH first binds with specific receptors on ovarian cell membrane

  • Option 4)

    FSH stimulates the secretion of estrogen and progesterone

 
As we learnt in  LH and FSH in females - In females, LH induces ovulation of fully mature follicles (graafian follicles) and maintains the corpus luteum, formed from the remnants of the graafian follicles after ovulation. - wherein FSH stimulates growth and development of the ovarian follicles in females.    FSH induces maturation of follicle Option 1) Glucagon is secreted by  -cells of...
Engineering
260 Views   |  

The maximum amount of electrolytes and water (70 - 80 percent) fromthe glomerular filtrate is reabsorbed in which part of the nephron?

  • Option 1)

    Ascending limb of loop of Henle

  • Option 2)

    Distal convoluted tubule

  • Option 3)

    Proximal convoluted tubule

  • Option 4)

    Descending limb of loop of Henle

 
As learnt FUNCTION OF THE TUBULES - Proximal Convoluted Tubule (PCT) - wherein PCT is lined by simple cuboidal brush border epithelium which increases the surface area for reabsorption. Nearly all of the essential nutrients, and 70-80 per cent of electrolytes and water are reabsorbed by this segment     PCT reabsorbs  70-80% of water and electrolytes Option 1) Ascending limb of loop of...
Engineering
110 Views   |  

The Leydig cells found in the human body are the secretory source of

  • Option 1)

    Progesterone

  • Option 2)

    intestinal mucus

  • Option 3)

    glucagon

  • Option 4)

    androgens

 
As learnt Hormones produced by testis - The Leydig cells or interstitial cells, which are present in the intertubular spaces produce a group of hormones called androgens mainly testosterone. -    Leydig cells secretes androgens (Testosterone) Option 1) Progesterone This option is incorrect Option 2) intestinal mucus This option is incorrect Option 3) glucagon This option is incorrect Option...
Engineering
106 Views   |  

The human hind brain comprises three parts, one of which is:

  • Option 1)

    Spinal cord

  • Option 2)

    Corpus callosum

  • Option 3)

    Cerebellum

  • Option 4)

    Hypothalamus

 
  Hindbrain - The hindbrain comprises pons, cerebellum and medulla (also called the medulla oblongata). -    Hind brain contains pons, cerebellum & medulla oblongata Option 1) Spinal cord Option is incorrect Option 2) Corpus callosum Option is incorrect Option 3) Cerebellum Option is correct Option 4) Hypothalamus Option is incorrect
Engineering
94 Views   |  

Select the correct statement regarding the specific disorder of muscular or skeletal system :-

  • Option 1)

    Muscular dystrophy - age related shortening or muscles.

  • Option 2)

    Osteoporosis - decrease in bone mass and higher chance of fractures with advancing age.

  • Option 3)

    Myasthenia gravis - Auto immune disorder which inhibits sliding of myosin filaments

  • Option 4)

    Gout - inflammation of joints due to extra deposition of calcium.

 
  Disorders Of Muscular And Skeletal System - Osteoporosis - wherein Age-related disorder characterised by decreased bone mass and increased chances of fractures. Decreased levels of estrogen is a common cause.     Option 1) Muscular dystrophy - age related shortening or muscles. Incorrect Option 2) Osteoporosis - decrease in bone mass and higher chance of fractures with advancing...
Engineering
129 Views   |  

In which one of the following options the two examples are correctly matched with their particular type of immunity

 

Examples

Type of immunity

 

  • Option 1)

    Polymorphonuclear leukocytes and mono cytes

    Cellular barriers

     

  • Option 2)

    Anti-tetanus and anti - snake bite injection

    Active immunity

     

  • Option 3)

    Saliva in mouth and Tears in eyes

    Physical barriers

     

  • Option 4)

    Mucus coating of epithelium lining the urnogenital tract and the HCl in stomach

    Pysiological barriers

     

 
  Types of WBCs - Type of agranulocytes - wherein lymphocytes and monocytes are different types of agranulocytes. monocytes (6-8 per cent) are phagocytic cells which destroy foreign organisms entering the body.    Macrophages and monocytes are phagocytic cells. They are cellular barriers and provide immunity. Option 1) Polymorphonuclear leukocytes and mono cytes Cellular...
Engineering
104 Views   |  

Anxiety and eating spicy food together in an otherwise normal human, may lead to

  • Option 1)

    Indigestion

  • Option 2)

    Jaundice

  • Option 3)

    Diarrhoea

  • Option 4)

    Vomiting

 
As we discussed in concept Disorders of digestive system - Indigestion - wherein In this condition, the food is not properly digested leading to a feeling of fullness. The causes of indigestion are inadequate enzyme secretion, anxiety, food poisoning, over eating, and spicy food.       Special vascularised structures called gills are used by most of the aquatic arthropods and...
Engineering
163 Views   |  

A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neuro-hormonal control system?

  • Option 1)

    Sympathetic nervous system is activated releasing epinephrin and norepinephrin from adrenal medulla.

  • Option 2)

    Neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse.

  • Option 3)

    Hypothalamus activates the parasympathetic division of brain.

  • Option 4)

    Sympathetic nervous system is activated releasing epinephrin and norepinephrin from adrenal cortex.

 
As we discussed in concepts Factors affecting Cardiac Output - A special neural centre in the medulla oblangata can moderate the cardiac function through autonomic nervous system (ANS). - wherein Neural signals through the sympathetic nerves (part of ANS) can increase the rate of heart beat, the strength of ventricular contraction and thereby the cardiac output.    and Adrenaline and...
Engineering
122 Views   |  

A certain road accident patient with unknown blood group needs immediate blood transfusion. His one doctor friend at once offers his blood. What was the blood group of the donor?

  • Option 1)

    Blood group B

  • Option 2)

    Blood group AB

  • Option 3)

    Blood group O

  • Option 4)

    Blood group A

 
  Universal Donors - Group ‘O’ blood can be donated to persons with any other blood group - wherein ‘O’ group individuals are called ‘universal donors’    O is a universal donor because all antigens are absent. Option 1) Blood group B This option is incorrect Option 2) Blood group AB This option is incorrect Option 3) Blood group O This option is correct. Option 4) Blood group A This option...
Engineering
149 Views   |  

Which one of the following is wrong statement

  • Option 1)

    Anabaena and Nostoc are capable of fixing nitrogen in free living state also.

  • Option 2)

    Root nodule forming nitrogen fixers live as aerobes under free-living conditions.

  • Option 3)

    Phosphorus is a constituent of cell membranes, certain nucleic acids and cell proteins.

  • Option 4)

    Nitrosomonas ans Nitrobacter are chemoautotrophs.

 
  Phosphorus Function - In synthesis of nucleic acids, phospholipids, ATP, NAD, NADP, osmotic regulation and hydration, translocation of sugar, phosphorylation reactions. - wherein Deficiency causes mottled chlorosis, premature death, cotton rust.    Phosphorus is a constituent of nucleic acids of both DNA and RNA but absent in cell membranes and cell proteins.     Option 1) Anabaena and...
Engineering
882 Views   |  

Best defined function of Manganese in green plants is:

  • Option 1)

    Photolysis of water

  • Option 2)

    Calvin cycle

  • Option 3)

    Nitrogen fixation

  • Option 4)

    Water absorption

 
As discussed 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     is required for photolysis of water Option 1) Photolysis of water Correct answer Option 2) Calvin cycle Incorrect answer Option 3) Nitrogen fixation Incorrect answer Option...
Engineering
604 Views   |  

A process that makes important difference between C3 and C4 plants is :

  • Option 1)

    Transpiration

  • Option 2)

    Glycolysis

  • Option 3)

    Photosynthesis

  • Option 4)

    Photorespiration

 
As discussed in Photorespiration - A process in plant metabolism where enzyme RuBisCO oxygenates RuBP, causing some of the energy produced by photosynthesis to be wasted. - wherein O2 enters Calvin cycle instead of Co2  this results in reduced rate of photosynthesis.      Photorespiration is negligible in C4 but present in C3 Option 1) Transpiration This is incorrect option Option...
Engineering
356 Views   |  

A nitrogen-fixing microbe associated with Azolla in rice fields is :

  • Option 1)

    Spirulina

  • Option 2)

    Anabaena

  • Option 3)

    Frankia

  • Option 4)

    Tolypothrix

 
  Symbotic nitrogen fixing bacteria - 1. Rhizobium - associated with roots of legume plants 2. Azolla (water fern) - associated with Anabaena azollae 3. Coralloid roots of Cycas -associated with Anabaena and Nostoc -    Azolla (water fern) is associated with Anbaena Option 1) Spirulina This is the incorrect option Option 2) Anabaena This is the correct option Option 3) Frankia This is the...
Engineering
163 Views   |  

Which one of the following is correctly matched

  • Option 1)

    Onion - Bulb

  • Option 2)

    Ginger - Sucker

  • Option 3)

    Chlamydomonas - Conidia

  • Option 4)

    Yeast - Zoospores

 
  Types of underground stem - Rhizome - It group parallel or horizontal to soil surface & bears nodes, internodes, buds, scally leaves. Eg: Banana, turneric, ginger, ferns Tuber - Disc like structure with numerous fleshy scaly leaves. Ex: Onion, lilly, garlic bulbs can be scaly or Imbricate (Garlic) and tunicate (Onion) Corm: Underground vertical stem. Ex: Saffron, Alocasia,...
Engineering
236 Views   |  

The common bottle cork is a product of:

  • Option 1)

    Dermatogen

  • Option 2)

    Phellogen

  • Option 3)

    Xylem

  • Option 4)

    Vascular Cambium

 
As we discussed in Cork cambium - Cork cambium or extrastelar cambium or phellogen arises from the hypodermis or from the outer layer of cortex. Cork cambium divides periclinically(divides both outer and inner side). The outer side cells become dead and known as cork or phellem. The inner side cells are differentiated into parenolyma and contain chloroplasts. These cells are called secondary...
Engineering
223 Views   |  

The coconut water and the edible part of coconut are equivalent to :

  • Option 1)

    Endosperm

  • Option 2)

    Endocarp

  • Option 3)

    Mesocarp

  • Option 4)

    Embryo

 
@12780  Option 1) Endosperm Correct Option 2) Endocarp Incorrect Option 3) Mesocarp Incorrect Option 4) Embryo Incorrect
Engineering
195 Views   |  

Select the correct statement from the ones given below with respect to Periplaneta americana.

  • Option 1)

    Nervous system located dorsally, consists of segmentally arranged ganglia joined by a pair of longitudinal connectives.

  • Option 2)

    Males bear a pair of short thread like anal styles.

  • Option 3)

    There are 16 very long Malpighian tubules present at the junctions of midgut and hindgut.

  • Option 4)

    Grinding of food is carried out only by the mouth parts.

 
As we discussed in Anal Styles - In male, the 9th sternite (segment) bears a pair of spine like anal styles, which are absent in female and are used to differentiate between male and female.  - wherein Additionally male cockroaches have long antennae than female.       Anal styles are present in make cockroaches. Option 1) Nervous system located dorsally, consists of segmentally arranged...
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