Plant Structure and Function: Root System

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Questions and Answers

What is the primary function of stems in plants?

  • Transport of nutrients and water (correct)
  • Photosynthesis
  • Storage of food
  • Reproduction

Which structures in leaves facilitate gas exchange?

  • Cuticles
  • Stomata (correct)
  • Phloem tubes
  • Xylem vessels

What defines a complete flower?

  • It lacks at least one of the reproductive structures.
  • It contains only male reproductive organs.
  • It contains only female reproductive organs.
  • It possesses all four main parts: sepals, petals, stamens, and pistils. (correct)

What is the role of fruits in fruiting plants?

<p>Protect and disperse seeds (B)</p> Signup and view all the answers

How do flowers attract pollinators?

<p>By emitting odors and colors (C)</p> Signup and view all the answers

What distinguishes a perfect flower from other types?

<p>It has both male and female reproductive organs. (D)</p> Signup and view all the answers

What role do nodes and internodes play in plant growth?

<p>Points for leaf attachment and growth areas (D)</p> Signup and view all the answers

Which of the following is true about photosynthesis in leaves?

<p>It is the primary function of leaves. (B)</p> Signup and view all the answers

What is one of the primary functions of roots in plants?

<p>They absorb water and nutrients. (D)</p> Signup and view all the answers

Which type of root system is typically found in monocots?

<p>Fibrous root system (A)</p> Signup and view all the answers

What is the primary function of the shoot system in plants?

<p>To produce flowers and fruits. (C)</p> Signup and view all the answers

Which of the following components is NOT part of the shoot system?

<p>Roots (C)</p> Signup and view all the answers

How do roots in dry areas typically adapt?

<p>By growing deeper root systems. (C)</p> Signup and view all the answers

What process do stems and leaves primarily assist with?

<p>Photosynthesis and nutrient transport. (B)</p> Signup and view all the answers

What type of plants typically possess deep taproots?

<p>Dicots like carrots. (A)</p> Signup and view all the answers

Which component of the plant's vascular system is responsible for transporting water?

<p>Xylem (C)</p> Signup and view all the answers

What is a key characteristic of asexual reproduction in plants?

<p>It produces genetically identical offspring. (D)</p> Signup and view all the answers

Which of the following methods is NOT a form of vegetative propagation?

<p>Tissue culture (A)</p> Signup and view all the answers

What process is involved in grafting?

<p>Inserting a scion into the stem of another plant. (D)</p> Signup and view all the answers

What is a plantlet in the context of plant reproduction?

<p>A tiny new plant that develops on leaf margins. (D)</p> Signup and view all the answers

Which of the following accurately describes tissue culture?

<p>A technique that involves the growth of tissues in artificial media. (D)</p> Signup and view all the answers

Which reproductive method involves roots developing from the stem?

<p>Marcotting (C)</p> Signup and view all the answers

What advantage does tissue culture provide in plant propagation?

<p>Propagation of a variety of plant species on a large scale. (B)</p> Signup and view all the answers

Which of the following is a method where cut stem and leaf can grow new plants?

<p>Kalanchoe stem and leaf cutting (B)</p> Signup and view all the answers

Flashcards

Taproot System

The main root that grows straight down, often found in plants with two seed leaves (dicots), allowing them to access deep water and nutrients. Examples include carrots and dandelions.

Fibrous Root System

A system of numerous smaller roots branching out from the base of the plant, typically found in plants with one seed leaf (monocots). These roots spread widely, helping to stabilize soil and absorb water and nutrients close to the surface. Examples include grasses and wheat.

Shoot System

The part of the plant above ground, responsible for growth, reproduction, and interacting with the environment. It includes stems, leaves, flowers, and fruits.

Stems

They provide structure and support, transport water and nutrients throughout the plant, and can store water and nutrients. Examples include stem tubers like potatoes.

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Leaves

They capture sunlight for photosynthesis, produce food for the plant, release oxygen, and can store water and nutrients. Examples include succulent leaves.

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Flowers

They are responsible for reproduction and the production of seeds. They may be brightly colored to attract pollinators.

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Fruits

They develop from the flower after pollination and contain seeds for the next generation of plants.

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Vascular System

The tissues within the stem that transport water and dissolved minerals from roots to leaves (xylem) and sugars produced in leaves to other parts of the plant (phloem).

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Sepals

The outermost parts of a flower, often green, protecting the developing bud.

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Petals

The colorful parts of a flower that attract pollinators.

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Stamens

The male reproductive organs of a flower, producing pollen.

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Pistils

The female reproductive organs of a flower, responsible for producing ovules.

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Budding

A method of asexual reproduction in plants where a new organism develops from a bud on the parent plant.

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Marcotting

A method of asexual reproduction in plants where roots are developed in a stem of a parent plant by burying it in soil.

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Grafting

A method of asexual reproduction in plants where a scion (cut shoot) is inserted into the stem of another plant (same or closely related species).

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Stem and leaf cutting

A method of asexual reproduction in plants where the cut stem or leaf is placed in moist soil and develops roots and shoots.

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Plantlets (e.g., kalanchoe)

Tiny new plants that develop along the edges of kalanchoe leaves and eventually fall off to grow independently.

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Tissue Culture

The science of growing plant tissues in controlled environments using artificial media.

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Sexual Reproduction

A method of reproduction that requires the union of two gametes (sperm and egg) to produce offspring.

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Asexual Reproduction

A method of reproduction that does not involve the union of gametes. Offspring are genetically identical to the parent.

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Study Notes

Plant Structure and Function

  • Plants are essential for life on Earth, providing food and oxygen
  • Plants are divided into two systems: the root system and the shoot system

Root System

  • Anchorage: Roots keep the plant grounded
  • Absorption: Roots take in water and nutrients from the soil
  • Storage: Roots store nutrients and energy for the plant
  • Transport: Roots move water and nutrients to other parts of the plant
  • Adaptation: Root systems adapt to their environment, with plants in dry areas often having deeper roots to reach water and plants in nutrient rich areas having shallower roots
  • Types of Roots:
    • Taproot System: A primary root grows downward, common in dicots (plants with two seed leaves). Taproots can go deep to reach water and nutrients (e.g., carrots, dandelions)
    • Fibrous Root System: Many small roots spread out from the base of the plant, common in monocots (plants with one seed leaf). Fibrous roots are usually shallow but improve soil stability (e.g., grasses, wheat)

Shoot System

  • The shoot system is as important as the root system, enabling effective sunlight capturing, producing flowers and fruit (allowing reproduction)
  • Components
    • Stems: Provide support for leaves and flowers, transport water, nutrients and sugars throughout the plant (xylem and phloem), stem growth is at nodes
    • Leaves: Site of photosynthesis, gas exchange (through stomata)
    • Flowers (if applicable): Reproductive structures (stamens, pistils), pollination occurs when a flower's pollen is transferred
    • Fruits: Develop from fertilized flowers to protect and disperse seeds.

Plant Reproduction

  • Reproduction is vital for species continuation
  • There are two types of plant reproduction
    • Asexual: No fertilization needed, offspring are clones (identical copies of the parent). Common methods:
      • Vegetative Propagation: New plants grow out of stems, buds, or leaves of the parent plant (e.g., budding, marcotting, grafting, kalanchoe cuttings, tissue culture).
      • note: Relevant videos are given for specific methods in the text,
      • Tissue Culture: Growing plant tissues in artificial media
    • Sexual: Requires fertilization (union of gametes: sperm and egg), offspring are not identical to the parent.

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