1. The _______ of rhubarb and celery plants are eaten by man.   roots   leaves   stems   Hint Half-n-half Clue   2. The gas that is exhaled by plants is _______ (during respiration).   Nitrogen   Oxygen   Carbon Dioxide   Half-n-half Clue   3. Which of the following is a flowering plant?   Fucus   Ash   Spirogyra   Mucor   Toadstool   Half-n-half Clue   4. Which of the following is not a herbaceous plant?   Sycamore   Marigold   Buttercup   Daisy   Clover   Half-n-half Clue   5. Wheat and other kinds of corn can be classified as cereals.   True   False   6. Which of the following materials/substances is not of plant origin?   Paper   Pearl   Rubber   Linen   Sugar   Half-n-half Clue   7. The organic material contained in soil is known as humus.   True   False