Download App

STD 11 - 19. Chemical coordination and integration — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 19. Chemical coordination and integration4 Marks
MCQ
Thyroxine is
  • A
    An enzyme
  • ✓
    A hormone
  • C
    A vitamin
  • D
    An excretory product
✓

Answer

Correct option: B.
A hormone
b
It's Obvious

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

NEET STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Match column $I$ with column $II$

Column$-I$ Column$-II$
$a.$ Capillaries $(i)$ Valves
$b.$ Veins $(ii)$ Smooth muscles
$c.$ Aorta $(iii)$ Narrowest blood vessels
$d.$ Tunica media $(iv)$ Elastic artery

 Select the alternative which shows the correct matching.

→
The extinct human who lived $1,00,000$ to $40,000$ years ago, in Europe, Asia and parts of Africa, with short stature, heavy eye brows, retreating fore heads, large jaws with heavy teeth, stocky bodies, a lumbering gait and stooped posture was
→
Which of the following statements are correct for regulation of cardiac activity ?
(i) A special neural centre in the medulla oblongata can moderate the cardiac function through autonomic nervous system.
(ii) Neural signals through the sympathetic nerves can increase the rate of heart beat, the strength of ventricular contraction and thereby the cardiac output.
(iii) Parasympathetic neural signals decrease the rate of heart beat, speed of conduction of action potential and thereby the cardiac output.
(iv) Adrenal medullary hormones can also increase the cardiac output.
(v) Adrenalin or epinephrine increase heart beat.
(vi) Acetylcholine decrease heart beat.
→
Which raw material is used in fermentation
→
Priyons are....
→
A comparison of the volume of the filtrate formed per day 180 litre per day with that of the urine released (1.5 litres), suggest that nearly 99 per cent of the filtrate has to be reabsorbed by the renal tubules. Which statement true for reabsorption ?
(i) Nearly all of the essential nutrients, 70-80 per cent of electrolytes and water are reabsorbed by this segment.
(ii) Reabsorption in loop of Henle is maximum.
(iii) Loop of Henle plays a significant role in the maintenance of high osmolarity of medullary interstitial fluid.
(iv) The descending limb of loop of Henle is permeable to water but almost impermeable to electrolytes.
(v) The ascending limb is impermeable to water but allows transport of electrolytes actively or passively.
(vi) Conditional reabsorption of Na and water takes place in PCT.
(vii) Large amounts of salt could be reabsorbed from collecting duct to produce a concentrated urine.
→
During each cardiac cycle, prominent sounds are produced which can be easily heard through stethoscope. They are
→
Universal character of insect is
→
A childless couple can be assisted to have a child through a technique called $GIFT. $ The full form of this technique is
→
$A$ : Presence of myelin sheath increases the rate of conduction of nerve impulse.

$R$ : Ionic channels are absent in the area covered by myelin sheath therefore, depolarization occurs only at the nodes of Ranvier, resulting in saltatory or jumping conduction.

→