At which point does the radicle emerge?

here are the answers to questions 9 and 10:

9. The graph below shows the triphasic water absorption by germinating seeds. At which point does the radicle emerge?

   • The graph illustrates three phases of water uptake during germination. Phase I (A to B) is rapid imbibition. Phase II (B to C) is a plateau where metabolic activity increases, but visible growth is minimal. Phase III (C to D) is characterized by renewed rapid water uptake, which coincides with cell elongation and division, leading to the emergence of the radicle and subsequent growth. Therefore, the radicle emerges around the beginning of Phase III.
   • The correct option is C.
   • Answer: $\boxed{\text{C}}$

10. Why do roots grow first before the shoots in seed germination?

    • The primary role of the radicle (embryonic root) is to anchor the seedling and, most importantly, to absorb water from the soil. Water is crucial for activating enzymes, hydrolyzing stored food reserves, and facilitating all the biochemical reactions necessary for the growth and development of the entire seedling, including the shoot.
    • The correct option is C.
    • Answer: $\boxed{\text{C. Roots take up water for early biochemical reactions.}}$