Class 7 Science - Reproduction in Plants Chapter 12 Exercise Solutions
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Questions and Answers

What is the term for the production of new individuals from the vegetative part of a parent?

  • Fertilization
  • Asexual reproduction (correct)
  • Pollination
  • Germination

    • What is the term for a flower that may have either male or female reproductive parts?

  • Androgynous
  • Hermaphrodite
  • Unisexual (correct)
  • Bisexual

    • What is the process known as the transfer of pollen grains from the anther to the stigma of the same or another flower of the same kind?

  • Dispersal
  • Pollination (correct)
  • Germination
  • Fertilization

    • What is the term for the fusion of male and female gametes?

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

    How do seeds disperse in plants?

    <p>Through wind, water, and animals</p> Signup and view all the answers

    What are the different methods of asexual reproduction?

    <p>Budding, fragmentation, and spore formation</p> Signup and view all the answers

    What is the main function of a flower?

    <p>To produce new seeds</p> Signup and view all the answers

    Which mode of asexual reproduction involves the formation of a new individual from a bulb-like projection called a bud?

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

    What type of reproduction occurs in yeast?

    <p>Asexual reproduction</p> Signup and view all the answers

    Which type of vegetative propagation occurs easily in nature and involves simple vegetative parts?

    <p>Natural vegetative propagation</p> Signup and view all the answers

    What is the main difference between self-pollination and cross-pollination?

    <p>The transfer of pollen from stamen to pistil</p> Signup and view all the answers

    Which type of reproduction requires only one parent?

    <p>Asexual reproduction</p> Signup and view all the answers

    In which mode of asexual reproduction are the newly developed plants identical to the parent and to each other?

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

    Which type of reproduction involves the production of seeds and requires two parents?

    <p>Sexual reproduction</p> Signup and view all the answers

    What are spores in terms of reproduction?

    <p>Tiny cells protected by a thick wall and used for sexual reproduction</p> Signup and view all the answers

    What is the main function of the reproductive parts in sexual reproduction?

    <p>To transfer pollen from one flower to another</p> Signup and view all the answers

    Which type of motion is exhibited by the hands while running?

    <p>Oscillatory motion</p> Signup and view all the answers

    What type of motion does a child on a see-saw experience?

    <p>Oscillatory motion</p> Signup and view all the answers

    In what type of motion is the motion of a child in a merry-go-round classified?

    <p>Circular motion</p> Signup and view all the answers

    What type of motion is demonstrated by the hammer of an electric bell?

    <p>Oscillatory motion</p> Signup and view all the answers

    What type of motion does a train on a straight bridge exhibit?

    <p>Linear motion</p> Signup and view all the answers

    What type of motion is shown by a horse pulling a cart on a straight road?

    <p>Straight line motion</p> Signup and view all the answers

    What is the basic unit of time?

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

    Which unit is used to measure the distance between two cities?

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

    What is the time period of a given pendulum?

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

    In which units is the speed of a train expressed?

    <p>Km/h and m/s</p> Signup and view all the answers

    What is the time period of a pendulum that takes 32 s to complete 20 oscillations?

    <p>$1.6 s$</p> Signup and view all the answers

    What is the speed of a train that takes 4 hours to cover a distance of 240 km?

    <p>$60 km/h$</p> Signup and view all the answers

    What is the distance moved by a car if its odometer reading changes from 57321.0 km to 57336.0 km in 20 minutes?

    <p>$35 km$</p> Signup and view all the answers

    What is the distance between Salma's house and her school if she takes 15 minutes to reach her school on a bicycle with a speed of 2 m/s?

    <p>$1.8 km$</p> Signup and view all the answers

    What does the distance-time graph look like for a car moving with a constant speed?

    <p>A straight horizontal line</p> Signup and view all the answers

    What does the distance-time graph look like for a car parked on a side road?

    <p>A straight horizontal line</p> Signup and view all the answers

    Study Notes

    Reproductive Terms and Processes

    • Asexual reproduction refers to the production of new individuals from the vegetative part of a parent.
    • Flowers with both male (stamens) and female (pistils) reproductive parts are termed perfect or bisexual flowers.
    • Pollination is the transfer of pollen grains from the anther to the stigma of the same or another flower of the same species.
    • Fertilization is the fusion of male and female gametes, leading to the formation of a zygote.

    Seed Dispersal and Asexual Reproduction Methods

    • Seeds disperse through various methods including wind, water, animals, and mechanical means.
    • Different methods of asexual reproduction include binary fission, budding, fragmentation, vegetative propagation, and spore formation.
    • The main function of a flower is reproduction, facilitating the processes of pollination and fertilization.

    Types of Asexual Reproduction

    • Budding is an asexual reproduction mode involving the formation of a new individual from a bulb-like projection called a bud.
    • Yeast typically reproduces through asexual budding.
    • Simple vegetative parts that enable easy natural propagation fall under vegetative propagation.

    Pollination Differences and Reproduction Types

    • Self-pollination occurs when pollen from the same flower fertilizes its own ovules, while cross-pollination involves pollen from one flower fertilizing another flower’s ovules.
    • Asexual reproduction requires only one parent, producing genetically identical offspring.
    • Clonal propagation results in newly developed plants that are identical to the parent and to each other.
    • Sexual reproduction involves the production of seeds and requires two parents.

    Spores and Sexual Reproduction

    • Spores are reproductive cells capable of developing into a new organism, particularly in fungi and certain plants.
    • The main function of reproductive parts in sexual reproduction is the formation of gametes, leading to fertilization.

    Motion and Measurement

    • The hands exhibit circular motion while running.
    • A child on a see-saw experiences oscillatory motion.
    • Motion of a child in a merry-go-round is classified as circular motion.
    • The hammer of an electric bell demonstrates periodic motion.
    • A train on a straight bridge exhibits linear motion.
    • A horse pulling a cart on a straight road displays rectilinear motion.

    Units of Measurement

    • The basic unit of time is the second.
    • Distance between two cities is typically measured in kilometers.
    • The time period of a given pendulum is defined by its oscillation frequency.
    • Speed of a train is generally expressed in kilometers per hour (km/h).

    Speed and Distance Calculations

    • The time period of a pendulum that takes 32 seconds to complete 20 oscillations can be calculated; it equals 1.6 seconds per oscillation.
    • A train traveling 240 km in 4 hours has a speed of 60 km/h.
    • If a car's odometer reading changes from 57321.0 km to 57336.0 km in 20 minutes, the distance moved is 15 km.
    • If Salma takes 15 minutes at a speed of 2 m/s to reach school, the distance to her school is 1800 meters (1.8 km).

    Distance-Time Graphs

    • A distance-time graph for a car moving with constant speed is a straight line with a positive slope.
    • A distance-time graph for a parked car shows a horizontal line, indicating no change in distance over time.

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    Description

    Test your understanding of Class 7 Science Chapter 12 'Reproduction in Plants' with exercise solutions. Fill in the blanks, answer questions about flower reproductive parts, and understand the transfer of pollen grains.

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