Final answer:
The statement about an angiosperm embryo's branches becoming the stem and first leaf is false. In dicotyledons (dicots), structures that resemble branches are cotyledons, which aid in absorbing food reserves, not in becoming the stem or the first leaf. The true leaves and stems develop from the plumule, and the radicle develops into the root.
Step-by-step explanation:
The statement that in an angiosperm embryo one of the two branches will become the stem, and the other becomes the first leaf is false. In the angiosperm embryo, the structures that may resemble branches are actually cotyledons, which are leaf-like organs that serve a specific purpose during the early stages of development. In dicotyledons, or dicots, which are one of the two groups of angiosperms, there are indeed two cotyledons, but these are not precursors to the stem and the first true leaf. Instead, these cotyledons help in absorbing the food reserves and support the early growth of the embryo. The embryo development eventually gives rise to the plumule and the radicle. The plumule, which is a part of the epicotyl, will develop into the first true leaves and stems, while the radicle becomes the root system of the plant.