1. The gas that is exhaled by plants is _______ (during respiration).   Oxygen   Carbon Dioxide   Nitrogen   Hint Half-n-half Clue   2. Which of the following plants has no chlorophyll?   Dandelion   Fern   Poppy   Holly   Mushroom   Half-n-half Clue   3. Which of the following materials/substances is not of plant origin?   Linen   Sugar   Pearl   Paper   Rubber   Half-n-half Clue   4. The organic material contained in soil is known as humus.   True   False   5. Which of the following plants cannot be classified as a grass?   Bamboo   Shallot   Vernal   Sugarcane   Wheat   Half-n-half Clue   6. Wheat and other kinds of corn can be classified as cereals.   True   False   7. Which of the following is a flowering plant?   Fucus   Ash   Spirogyra   Toadstool   Mucor   Half-n-half Clue