1. During _______, the pollen grains are transferred from the anthers of one flower to the stigma of another flower.   self-pollination   cross-pollination   2. The growth of a pollen tube enables pollination to take place.   True   False   3. Which of the following is not dispersed by animals?   Poppy   Mimosa   Plumbago   Xanthium   Urena   Hint Half-n-half Clue   4. The conditions required for seeds to germinate are oxygen, water and warmth.   True   False   5. The male flower of the hazel plant is known as the _______.   catkin   corymb   capitulum   Half-n-half Clue   6. The hard wood in the center of a tree trunk is referred to as 'heartwood'.   True   False   7. What is a seed called before it undergoes fertilization?   Embryo   Ovary   Ovule   Half-n-half Clue