12. When continued cell divisions result in the formation of heart-sha in this stage. A. Sporangium Stage C. Sorus Stage B. Prothallus Stage D. Frond Stage 13. Which of the following statements is NOT TRUE? A. Ferns reproduce by means of producing spores the blac spots under underside the leaves. B. Spore-bearing plants have slightly different life cycles fr C. Spores are reproductive cells of all non-flowering plants D. Spores are produced in the structure called sori. 14. It is the process where the male sperm cell joins with the fe C. fertilization A. self- pollination D. germination B. cross-pollination​