Vascular tissue is a complex network of cells that are responsible for the transport of water, nutrients, and sugars throughout a plant. It is made up of two main types of tissues: xylem and phloem.
Xylem
Xylem is responsible for transporting water and minerals from the roots to the rest of the plant. It is composed of several types of cells, including:
Vessel elements: These are long, tube-like cells that are stacked on top of each other. They are responsible for the efficient transport of water.
Tracheids: These are another type of water-conducting cell, found in some plants, and are tapered at the ends, allowing for water to flow through.
Parenchyma cells: These are living cells that provide support and storage in the xylem.
Sclerenchyma fibers: These are long, slender cells that provide structural support to the xylem.
Phloem
Phloem is responsible for the transport of sugars, amino acids, and other organic compounds throughout the plant. It is composed of several types of cells, including:
Sieve tube elements: These are the main cells responsible for transporting sugars. They are arranged end-to-end to form sieve tubes.
Companion cells: These cells are located alongside the sieve tube elements and provide metabolic support to keep the sieve tube elements functioning.
Use evidence and scientific reasoning to explain how characteristic animal behaviors (e.g., building nests to protect young from cold, herding to protect young from predators, attracting mates for breeding by producing special sounds and displaying colorful plumage, transferring pollen or seeds to create conditions for seed germination and growth) and specialized plant structures (e.g., flower brightness, nectar, and odor attracting birds that transfer pollen; hard outer shells on seeds providing protection prior to germination) affect the probability of successful reproduction of both animals and plants.