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How do the organs and tissues of a plant carry out transport, support, reproduction, and photosynthesis?

Relate the structure of plant organs and tissues to their function, including transport, support, reproduction, and photosynthesis (NGSSS SC.912.L.14.7; Reporting Category 3, Organisms, Populations, and Ecosystems).

A benchmark-level answer on plant structure for the Florida Biology 1 EOC: roots, stems, leaves, and flowers, the transport tissues xylem and phloem, support, reproduction, and the leaf as the site of photosynthesis.

Generated by Claude Opus 4.811 min answer

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  1. What this topic is asking
  2. The plant organs and their functions
  3. Transport: xylem and phloem
  4. The leaf and photosynthesis
  5. Support and reproduction
  6. Try this

What this topic is asking

The NGSSS benchmark SC.912.L.14.7 asks you to relate the structure of plant organs and tissues to their functions: transport, support, reproduction, and photosynthesis. For the Florida Biology 1 EOC you need to know the main plant organs (roots, stems, leaves, flowers), the two transport tissues (xylem and phloem), and how each structure suits its job. This is a structure and function topic, so items reward connecting a feature to a function.

The plant organs and their functions

Each organ is a structure-and-function pairing the EOC can test directly.

Transport: xylem and phloem

Water moves up the xylem thanks to water's cohesion and adhesion (see the properties of water) as water evaporates from the leaves and pulls more up behind it. The clue on the EOC: xylem moves water up; phloem moves food (sugar).

The leaf and photosynthesis

The leaf's structure is built for photosynthesis:

  • It is broad and flat, giving a large surface area to absorb light.
  • It contains many chloroplasts (especially in the upper cells) where photosynthesis happens.
  • It has tiny pores called stomata (usually on the underside) that open to let carbon dioxide in and oxygen out, and through which water vapor is lost (transpiration). Guard cells open and close the stomata.

So a broad leaf full of chloroplasts is optimized to capture light and exchange the gases photosynthesis needs.

Support and reproduction

  • Support. Stems hold the plant upright so leaves reach the light, and the cell wall and turgor pressure (water filling the central vacuole) keep cells firm. A plant short of water wilts because the cells lose turgor.
  • Reproduction. Flowers are the reproductive organs. They produce the structures for sexual reproduction (pollen and ovules), leading to seeds that grow into new plants.

Try this

Q1. State the function of xylem and of phloem. [2]

  • Cue. Xylem carries water and minerals upward from the roots; phloem carries sugars made in the leaves to the rest of the plant.

Q2. Explain why a leaf is broad and flat and contains many chloroplasts. [2]

  • Cue. The broad, flat shape gives a large surface area to absorb light, and the many chloroplasts capture that light for photosynthesis.

Exam-style practice questions

Practice questions written in the style of FLDOE exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.

FL Biology 1 EOC (2023 released style)1 marksWhich plant tissue transports water and minerals from the roots up to the leaves? (A) Phloem. (B) Xylem. (C) Epidermis. (D) Stomata.
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A 1-point multiple-choice item on plant transport tissue.

The correct answer is B. Xylem carries water and dissolved minerals upward from the roots to the rest of the plant. Phloem carries sugars made in the leaves to other parts, the epidermis is the outer covering, and stomata are the pores for gas exchange. Match the tissue to what it moves.

Xylem carries water up (think x for "up the stem"); phloem carries food (sugar) made by photosynthesis.

FL Biology 1 EOC (2024 released style)1 marksWhy are most leaves broad and flat, and why do they contain many chloroplasts? (A) To store water for the plant. (B) To capture as much light as possible for photosynthesis. (C) To anchor the plant in the soil. (D) To transport sugars to the roots.
Show worked answer →

A 1-point item relating leaf structure to function.

The correct answer is B. A broad, flat leaf has a large surface area to absorb light, and its many chloroplasts capture that light for photosynthesis. Storing water and anchoring are root functions, and transport is the job of vascular tissue, so the other options misassign the function.

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