Given below are four statements i-iv regarding geological time scale. Read them carefully.
(i) Paleozoic era is the era of ancient life.
(ii) Ordovician period is the age of vertebraes.
(iii) Carboniferous period is the age of reptiles
(iv) Proterozoic era is the era of early life
Which of the above two statements are incorrect ?

Given below are three statements (I -IV) regarding the human blood circulatory system . (I) In the treatment of angina pectoris nitrous oxide and nitro glycerin are used. (II) veins have thinner walls and broader lumen than arteries . (III) Artificial pacemakers are used in arrhythmia. How many of the above are correct statements ?

Given below are three statements (I -IV) regarding the human blood circulatory system . (I) In the treatment of angina pectoris nitrous oxide and nitro glycerin are used. (II) veins have thinner walls and broader lumen than arteries . (III) Artificial pacemakers are used in arrhythmia. How many of the above are correct statements ?

Which of the following eras, in geological time scale corresponds to the period when life had not originated upon the earth?

Which of the following eras, in geological time scale corresponds to the period when life had not originated upon the earth?

Which of the following eras, in geological time scale corresponds to the period when life had not originated upon the earth?

Read the following statements carefully to answer these questions : (i) X is older than L. (ii) M and N are of equal age. (iii) Z is the youngest. (iv) Y is younger than N. (v) Y is older than X. Which two of the above statements indicate that Y is older than L?

Read the following statements carefully. (i) An electrostatic precipitator removes particulate matter by imposing negative charge on them. (ii) Catalytic converters convert unburnt hydrocarbons into CO_(2) and water. (iii) Peroxyacyl nitrates (PAN) is a secondary pollutant. (iv) DDT is a non-biodegradable pollutant. Which of the above statements are incorrect ?

Read the following statements carefully. (i) An electrostatic precipitator removes particulate matter by imposing negative charge on them. (ii) Catalytic converters convert unburnt hydrocarbons into CO_(2) and water. (iii) Peroxyacyl nitrates (PAN) is a secondary pollutant. (iv) DDT is a non-biodegradable pollutant. Which of the above statements are incorrect ?

Read the following statements carefully. (i) An electrostatic precipitator removes particulate matter by imposing negative charge on them. (ii) Catalytic converters convert unburnt hydrocarbons into CO_(2) and water. (iii) Peroxyacyl nitrates (PAN) is a secondary pollutant. (iv) DDT is a non-biodegradable pollutant. Which of the above statements are incorrect ?

Given below are four statements (i-iv) regarding human blood circulatory system (i) Arteries are thick-walled and have narrow lumen as compared to veins (ii) Angina is acute chest pain when the blood circulation to the brain is reduced (iii) Persons with blood group AB can donate blood to any person with any blood group under ABO system (iv) Calcium ions play a very important role in blood clotting Which two of the above statements are correct ?