Transport of Food and Minerals in Plants

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Questions and Answers

What is the primary role of phloem in plants?

  • Structural support
  • Transport of food substances (correct)
  • Water conduction
  • Storage of starch and nutrients

The xylem is responsible for transporting food substances in the plant.

False (B)

What is osmosis?

The movement of water molecules from a region of higher concentration to one of lower concentration through a semipermeable membrane.

Roots draw in water and nutrients from the soil primarily through _____ hair cells.

<p>root</p> Signup and view all the answers

What role does xylem parenchyma play in the plant?

<p>Storage of starch and compounds (A)</p> Signup and view all the answers

Match the following structures with their roles in plants:

<p>Xylem = Water conduction Phloem = Food transport Root hairs = Nutrient absorption Xylem fibers = Structural reinforcement</p> Signup and view all the answers

A semipermeable membrane allows large solute molecules to pass freely.

<p>False (B)</p> Signup and view all the answers

What occurs when water accumulates in the vacuole of a plant cell?

<p>The concentration of the sap inside the vacuole becomes diluted.</p> Signup and view all the answers

What drives the upward movement of water in plants?

<p>Transpiration pull (B)</p> Signup and view all the answers

Transpiration helps to cool the plant and protect it from excessive sunlight.

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

What are leaf pores called that facilitate transpiration?

<p>Stomata</p> Signup and view all the answers

Plants absorb minerals through ______ hairs using energy.

<p>root</p> Signup and view all the answers

Which of the following is classified as a macronutrient?

<p>Potassium (D)</p> Signup and view all the answers

Match the following types of minerals with their category:

<p>Nitrogen = Macronutrient Zinc = Micronutrient Calcium = Macronutrient Manganese = Micronutrient</p> Signup and view all the answers

Active transport requires energy to move molecules against their concentration gradient.

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

Root pressure pushes water into the ______, especially up the stem.

<p>xylem</p> Signup and view all the answers

Phloem is responsible for the upward movement of water in plants.

<p>False (B)</p> Signup and view all the answers

What process allows the movement of molecules from high concentration to low concentration in single-celled organisms?

<p>Diffusion</p> Signup and view all the answers

Xylem cells have thickened walls due to the presence of ______.

<p>lignin</p> Signup and view all the answers

Match the following components of plant transportation with their functions:

<p>Xylem = Transport of water and minerals Phloem = Transport of food materials Tracheids = Non-living cells that facilitate water transport Parenchyma = Living cells responsible for storage and transport</p> Signup and view all the answers

Which of the following statements best describes transpiration?

<p>The loss of water vapor from plant leaves (C)</p> Signup and view all the answers

Root pressure is a mechanism that helps in the upward movement of food materials.

<p>False (B)</p> Signup and view all the answers

The _______ is responsible for conducting food materials throughout the plant body.

<p>phloem</p> Signup and view all the answers

Flashcards

Transport (in Plants)

The movement of substances from one location to another. In biology, it often refers to the movement of food, water, and minerals throughout a plant.

Diffusion

The process by which molecules move from an area of higher concentration to an area of lower concentration, until they are evenly distributed.

Water & Mineral Transport

The movement of water and minerals upwards from the roots to the different sections of a plant through the stem. It happens inside the xylem.

Food Transport

The movement of food material produced in the leaves to the entire plant body. It happens inside the phloem.

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Xylem

A type of plant tissue that transports water and dissolved minerals upward from the roots to the rest of the plant.

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Phloem

A type of plant tissue that transports sugars produced during photosynthesis to different parts of the plant.

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Osmosis

The movement of water molecules across a semi-permeable membrane from an area of higher water concentration to an area of lower water concentration.

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Transpiration

The loss of water vapor from the leaves of a plant through tiny pores called stomata.

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What is the primary function of the xylem?

The primary function of the xylem is to transport water and dissolved minerals from the roots up to the rest of the plant.

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What role do tracheids and xylem fibers play in the xylem?

Tracheids and xylem fibers contribute to the xylem's structural support, giving strength and stability to the plant.

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What is the function of xylem parenchyma?

Xylem parenchyma cells participate in the storage of starch and other compounds within the plant.

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What is the primary function of the phloem?

Phloem is a complex tissue responsible for transporting sugars and other organic nutrients throughout the plant.

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What is the function of phloem parenchyma?

Phloem parenchyma cells contribute to the storage of organic compounds, much like the parenchyma cells in the xylem.

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What is the role of phloem fibers?

Phloem fibers provide structural support, contributing to the plant's overall strength and stability.

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What is osmosis?

Osmosis is the movement of water across a semipermeable membrane from an area of high water concentration to an area of low water concentration.

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What are root hairs and what is their function?

Root hairs are tiny extensions found near the tip of roots, primarily responsible for absorbing water and minerals from the soil through osmosis.

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Transpiration Pull

The force created by transpiration that pulls water upwards from roots to leaves.

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Stomata

Pores on leaves where transpiration occurs.

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Root Pressure

The force that pushes water from root cells into the xylem.

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Active Transport

Movement of molecules across a membrane against a concentration gradient, requiring energy.

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Mineral Absorption

The absorption of minerals by root hairs, even though there is a lower concentration of minerals in the soil.

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Essential Elements

Elements essential for plant growth and development.

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Macronutrients

Essential elements needed in large amounts by plants, such as carbon, hydrogen, oxygen, nitrogen, phosphorus, and potassium.

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Study Notes

Transport of Food and Minerals in Plants

  • Organisms need food, water, and oxygen to survive
  • Plants require carbon dioxide, water, and sunlight for photosynthesis
  • Food, water, and minerals must be transported within the plant
  • Waste products must also be transported and removed
  • Plants have complex transport systems like xylem and phloem to carry materials

Transport in Single-celled and Basic Multicellular Plants

  • Single-celled organisms like Chlamydomonas and Spirogyra utilize diffusion for material transport
  • Diffusion moves molecules from higher concentration to lower concentration until evenly distributed

Transport in Higher Plants

  • Higher plants have specialized vascular tissues (xylem and phloem) enabling efficient transportation of substances
  • Water and minerals are transported upwards through xylem from roots to other parts of the plant
  • Food produced in leaves is transported through phloem to other parts of the plant

Structure and Roles of Xylem and Phloem

  • Xylem
    • Composed of tracheids and vessels
    • Non-living cells, with thick walls reinforced by lignin
    • Transports water and minerals
    • Provides structural support
  • Phloem
    • Composed of sieve tubes and companion cells
    • Living cells that transport sugars and other organic materials
    • Facilitates bidirectional transport of materials

Osmosis

  • Movement of water across a semipermeable membrane from high to low water concentration
  • Water moves from an area of high water potential to low water potential
  • Important for water uptake by plant roots

Transpiration

  • Process of water loss from leaves of plants through stomata
  • Water evaporates from leaves, creating a pull that draws more water up from the roots
  • Important for cooling the plant and moving water throughout the plant
  • Factors affecting transpiration include light, temperature, humidity, and wind speed

Root Pressure

  • Force that pushes water from roots up into the xylem of stems
  • Created by osmosis causing water to move into xylem

Active Transport

  • Movement of substances against a concentration gradient, requiring energy (ATP)
  • Plants use active transport to absorb minerals from the soil even when their concentration is lower in the roots than the surrounding soil solution
  • Essential for absorption of minerals that are needed by the plant

Essential Minerals in Plants

  • Macronutrients and micronutrients are essential plant nutrients
  • Examples of nutrients: Nitrogen, potassium, magnesium, copper, molybdenum, zinc.
  • Deficiency of essential minerals can lead to various diseases in plants.

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