Question

Which of the following occur during the formation of an embryo from a zygote in angiosperms?I. The root and shoot systems emerge from the seed.II. The basal cell forms a suspensor that provides a route for nutrient transfer between the parent plant and the developing embryo.III. Meiosis produces a mass of cells that become the young embryo.IV. Cells differentiate to form the basic plant tissue types.V. The early root-shoot axis is formed.

Answer 1

The answers are;

II -The basal cell forms a suspensor that provides a route for nutrient transfer between the parent plant and the developing embryo.

IV - Cells differentiate to form the basic plant tissue types.

V- The early root-shoot axis is formed.

Step-by-step explanation:

Fertilization in angiosperms occurs twice simultaneously and is known as Double Fertilization in which the pollen tube releases two sperms into the embryonic sac and one sperm fuses with the egg to form a zygote while the other sperm fuses with the polar nuclei. The development of the zygote into an embryo involves a series of mitotic divisions;

1. The development of a basal stalk or suspensor at the micropylar end which disappears after a short time.
2. The region opposite the micropyle which is at the Chalazal end is the embryo proper.
3. The embryo differentiates with the development of cells and organs. This has to do with the development of a radicle (primary root apical meristem) close to the suspensor and the development of one or two cotyledons in monocotyledons or dicotyledons respectively at the opposite end from the suspensor.
4. A shoot apical meristem differentiates either next to the single cotyledon (in monocotyledon) or between the two cotyledons (in dicotyledons). This becomes the site of stem differentiation

Answer 2

Answer: II, IV and V

Step-by-step explanation:

During the formation of an embryo from a zygote in angiosperms, the following process take place; The division of the basal cell gives rise to the suspensor, which eventually makes connection with the maternal tissue. The suspensor provides a route for nutrition to be transported from the mother plant to the growing embryo.

Meristems produce cells that quickly differentiate, or specialize, and become permanent tissue. Such cells take on specific roles and lose their ability to divide further. They differentiate into three main tissue types: dermal, vascular, and ground tissue. The early root-shoot axis is formed by auxin and cytokinin signaling which participates in regulating a large spectrum of developmental and physiological processes in plants.