Q6. Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?
Question 7
Q7. Ptyalin is an enzyme produced in the
Question 8
Q8. Ordinary table salt is sodium chloride. What is baking soda?
Question 9
Q9. Ozone hole refers to
Question 10
Q10. Pine, fir, spruce, cedar, larch and cypress are the famous timber-yielding plants of which several also occur widely in the hilly regions of India. All these belong to
