Botany and Plant Science

Growing regions, including meristems, young leaves, developing fruits, and storage organs, all act as metabolic sinks that require a constant supply of mineral elements.

Dorsiventral leaves (typical of dicots) usually have more stomata on the lower surface, while isobilateral leaves (typical of monocots) have an approximately equal number on both surfaces.

Pinus is a classic example of a plant that forms an obligate symbiotic association with fungi known as mycorrhiza.

The apoplast consists of the non-living parts of the plant, including cell walls and intercellular spaces, as well as xylem vessels and tracheids.

The apoplast includes the continuum of cell walls and intercellular spaces, which is continuous throughout the plant except where blocked by the Casparian strip in the endodermis.

Flowering plants exhibit complex transport systems for water, minerals, and organic compounds, which move in various directions to support growth and development.

Male 2n -> gamete n. Female 4n -> egg 2n, polar nuclei 2n+2n. Embryo = 2n (egg) + n (sperm) = 3n. Endosperm = 2n+2n (polar) + n (sperm) = 5n.

Emasculation is the removal of anthers from a bisexual flower to prevent self-pollination. In unisexual flowers, the plant already produces separate male and female flowers, so emasculation is unnecessary.

Pollen-pistil interaction is a dynamic process where the stigma recognizes compatible pollen and promotes its germination, while simultaneously inhibiting incompatible or foreign pollen.

In the majority of angiosperms, the pollen tube enters the ovule through the micropyle, which is the small opening in the integuments.