(a) due to excess concentration of CO₂ in blood
(b) due to excess concentration of CO₂ in lungs
(c) due to excess concentration of O₂ in lungs
(d) None of these
Q2. Which among the following living being has respiratory organ but does not have brain?
(c) blood succor
Q3. Which vitamin helps in blood coagulation?
Q4. A substance that stimulates the production of antibodies when introduced into a living organism is known as–
Q5. ‘Darwin finches’ refer to a group of:
Q6. The tissue in man where no cell division occurs after birth is
Q7. The source of oxygen generated during photosynthesis is:
(b) carbon dioxide
(d) mesophyll cells
Q8. Which one of the following elements is associated with teeth disorder?
Q9. Which one of the following is an abnormal constituent of urine?
(c) Uric acid
(d) Ketone bodies
Q10. Which one of the following cells produces antibodies?