Plant Root System
38 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the function of root hairs in plants?

  • To absorb sunlight
  • To produce food through photosynthesis
  • To store food
  • To absorb water and nutrients from the soil (correct)

    • The cell wall of a root hair is selectively permeable.

    False

    What is the main function of the cell membrane in a root hair?

    The cell membrane is selectively permeable, allowing only selected substances to pass through it.

    The root system of a plant consists of the main root and _______________________ roots.

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

    What is the main component of a root hair that allows it to absorb water and nutrients?

    <p>Cell wall</p> Signup and view all the answers

    Root hairs are extensions of the nucleus of an epidermal cell.

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

    The_____________________ of a root hair is rigid and freely permeable.

    <p>cell wall</p> Signup and view all the answers

    Match the following components of a root hair with their descriptions:

    <p>Cell wall = Rigid and freely permeable Cell membrane = Selectively permeable Cytoplasm = Contains organelles and nucleus Nucleus = Controls cell growth and division</p> Signup and view all the answers

    What is the effect of sunlight on the rate of transpiration?

    <p>It increases the rate of transpiration</p> Signup and view all the answers

    High humidity increases the rate of transpiration.

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

    What is the cooling effect of transpiration in plants?

    <p>Transpiration helps plants cool themselves by using heat from the plant body for evaporation.</p> Signup and view all the answers

    The rate of transpiration is higher when the temperature is ___________.

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

    Match the factors with their effects on the rate of transpiration:

    <p>Sunlight = Increases the rate of transpiration Temperature = Increases the rate of transpiration when high Wind = Increases the rate of transpiration when blowing faster Humidity = Reduces the rate of transpiration when high</p> Signup and view all the answers

    What is the process of water and minerals moving upwards from the roots to the stern called?

    <p>Ascent of sap</p> Signup and view all the answers

    What is the effect of wind on the rate of transpiration?

    <p>It increases the rate of transpiration</p> Signup and view all the answers

    Transpiration helps maintain the concentration of sap inside the plant body.

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

    Osmosis is the process of water moving from an area of high concentration to an area of low concentration.

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

    What is the role of root-hairs in the ascent of sap?

    <p>Root-hairs increase the surface area of the root, allowing for more efficient absorption of water and minerals.</p> Signup and view all the answers

    Why is transpiration important in plants?

    <p>Transpiration is important for cooling the plant and maintaining the concentration of sap inside the plant body.</p> Signup and view all the answers

    The central _______________ is responsible for transporting water and minerals upwards from the roots.

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

    Match the following components with their functions:

    <p>Root-hairs = Increase surface area for absorption Central xylem = Transport water and minerals upwards Stem = Supports the plant above ground</p> Signup and view all the answers

    What is the direction of the movement of water and minerals in the ascent of sap?

    <p>Upwards from the roots to the stem</p> Signup and view all the answers

    The ascent of sap is an active process that requires energy.

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

    What is one importance of the ascent of sap?

    <p>One importance of the ascent of sap is that it allows plants to transport water and minerals to their leaves, supporting photosynthesis and growth.</p> Signup and view all the answers

    What are the three main ways water is important for plants?

    <p>Transportation, Food production, and Cooling</p> Signup and view all the answers

    During photosynthesis, water combines with oxygen to produce glucose and carbon dioxide.

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

    What is the cooling effect experienced under a tree on a hot summer day due to?

    <p>loss of water from leaves by evaporation</p> Signup and view all the answers

    Water in xylem and phloem of a plant transports substances in a ______________ form.

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

    Match the ways water is important for plants with their descriptions:

    <p>Transportation = Water transports substances in a solution form Food production = Water combines with carbon dioxide to produce glucose and oxygen Cooling = Water transpires from the surface of leaves, producing a cooling effect</p> Signup and view all the answers

    What is the purpose of covering a small, well-watered potted plant with a transparent polythene bag in Activity 3?

    <p>to demonstrate transpiration</p> Signup and view all the answers

    What is the primary characteristic of a semi-permeable membrane?

    <p>Allows only water molecules to pass through</p> Signup and view all the answers

    The concentration of sugar molecules is higher in Side A.

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

    What is the main difference between Side A and Side B?

    <p>Side A contains a dilute sugar solution, whereas Side B contains a concentrated sugar solution.</p> Signup and view all the answers

    The semi-permeable membrane has pores of a size that allows _______ molecules to pass through.

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

    Match the following components with their descriptions:

    <p>Side A = Contains a dilute sugar solution Side B = Contains a concentrated sugar solution Semi-permeable membrane = Allows only water molecules to pass through</p> Signup and view all the answers

    What is the direction of water molecules in the diagram?

    <p>From Side A to Side B</p> Signup and view all the answers

    Sugar molecules can pass through the semi-permeable membrane.

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

    What is the purpose of the diagram in the figure?

    <p>The diagram illustrates the nature of a semi-permeable membrane.</p> Signup and view all the answers

    Study Notes

    Root System in Plants

    • A plant's root system consists of a main root, lateral roots, and root hairs.
    • Root hairs are long extensions of epidermal cells that absorb water and minerals from the soil.
    • Root hairs have a rigid cell wall and a selectively permeable cell membrane that allows water and minerals to pass through.

    Structure of a Root Hair

    • A root hair cell consists of a cell wall, cell membrane, cytoplasm, and nucleus.
    • The cell wall is rigid and freely permeable, allowing substances to pass through.
    • The cell membrane is selectively permeable, allowing only selected substances to pass through.

    Semi-Permeable Membrane

    • A semi-permeable membrane allows certain substances to pass through while restricting others.
    • Water molecules can pass through the pores of the membrane, but sugar molecules cannot.

    Ascent of Sap

    • Water absorbed by root hairs enters the xylem and is transported upwards to the stem and leaves.
    • This process is called the ascent of sap.
    • The ascent of sap is driven by transpiration, which creates a negative pressure that pulls water upwards.

    Factors Affecting Transpiration

    • Sunlight: Transpiration rate increases during the day when stomata are open.
    • Temperature: High temperatures increase the rate of transpiration.
    • Wind: Faster wind speeds increase the rate of transpiration.
    • Humidity: High humidity reduces the rate of transpiration.

    Importance of Transpiration

    • Cooling effect: Transpiration helps plants cool themselves by evaporating water.
    • Maintaining sap concentration: Transpiration helps maintain the concentration of sap inside the plant body.

    Uses of Water in Plants

    • Transportation: Water transports substances in a solution form within the plant.
    • Food production: Water is used in photosynthesis to produce glucose and oxygen.
    • Cooling: Transpiration produces a cooling effect, making the air cooler and more pleasant.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    This quiz covers the structure and function of the root system in plants, including the main root, lateral roots, and root hairs.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser