1. Which of the following is not dispersed by animals?   Plumbago   Urena   Xanthium   Poppy   Mimosa   Hint Half-n-half Clue   2. The hard wood in the center of a tree trunk is referred to as 'heartwood'.   True   False   3. The growth of a pollen tube enables pollination to take place.   True   False   4. Which of the following is not dispersed by animals?   Tribulus   Boerhaavia   Lotus   Guava   Martynia   Half-n-half Clue   5. Insects visit flowers in the search of _______.   water   nectar   fragrance   Half-n-half Clue   6. In a flowering plant, fruits begin to form after the processes of pollination and fertilization.   True   False   7. During _______, the pollen grains are transferred from the anthers of a flower to the stigma of the same flower.   self-pollination   cross-pollination