1. How is the age of a tree determined?   By measuring its height   By counting the annual rings in a cut trunk   By counting the number of its branches   By measuring its girth   Hint Half-n-half Clue   2. Fish breathe through   Skin   Gills   Lungs   Fins   Half-n-half Clue   3. What is the pulse rate of an average healthy human being?   65 beats per minute   72 beats per minute   16 beats per minute   100 beats per minute   Half-n-half Clue   4. Which food stuff turns blue-black when brought in contact with iodine?   Vitamins   Proteins   Starch   Unsaturated Fatty Acids   Half-n-half Clue   5. Which of the following are known as "aves"?   Birds   Mammals   Reptiles   Fish   Half-n-half Clue   6. Which of the following is a parasite?   Ringworm   Wolves   Zebra   Pigs   Half-n-half Clue   7. The feathers of birds are good insulators.   True   False