Class 7 Science - Reproduction in Plants Chapter 12 Exercise Solutions
32 Questions
14 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 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 (A)</p> Signup and view all the answers

How do seeds disperse in plants?

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

What are the different methods of asexual reproduction?

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

What is the main function of a flower?

<p>To produce new seeds (A)</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 (B)</p> Signup and view all the answers

What type of reproduction occurs in yeast?

<p>Asexual reproduction (D)</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 (A)</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 (C)</p> Signup and view all the answers

Which type of reproduction requires only one parent?

<p>Asexual reproduction (A)</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 (B)</p> Signup and view all the answers

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

<p>Sexual reproduction (B)</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 (B)</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 (C)</p> Signup and view all the answers

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

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

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

<p>Oscillatory motion (A)</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 (B)</p> Signup and view all the answers

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

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

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

<p>Linear motion (D)</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 (B)</p> Signup and view all the answers

What is the basic unit of time?

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

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

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

What is the time period of a given pendulum?

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

In which units is the speed of a train expressed?

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

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

<p>$1.6 s$ (A)</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>$60 km/h$ (C)</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>$35 km$ (D)</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>$1.8 km$ (A)</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 (B)</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 (C)</p> Signup and view all the answers

Flashcards

Asexual Reproduction

Reproduction without the involvement of sex cells or gametes, resulting in offspring genetically identical to the parent.

Perfect Flower

A flower containing both male (stamens) and female (pistils) reproductive parts.

Pollination

The transfer of pollen grains from the anther of a flower to the stigma of the same or another flower of the same species.

Fertilization

The fusion of male and female gametes (sperm and egg) to form a zygote, the first cell of a new individual.

Signup and view all the flashcards

Seed Dispersal

The process by which seeds are dispersed to new locations, enabling plant propagation and colonizing new areas.

Signup and view all the flashcards

Budding

A form of asexual reproduction where a new individual develops from an outgrowth or bud on the parent organism.

Signup and view all the flashcards

Fragmentation

A simple method of asexual reproduction where a part of the parent organism breaks off and develops into a new individual.

Signup and view all the flashcards

Vegetative Propagation

A form of asexual reproduction where new plants are produced from specific vegetative parts of the parent plant, such as roots, stems, or leaves.

Signup and view all the flashcards

Spore Formation

A type of asexual reproduction common in fungi and certain plants, involving the production of single-celled reproductive units called spores.

Signup and view all the flashcards

Reproduction in Flowers

The primary function of a flower, encompassing the processes of pollination and fertilization.

Signup and view all the flashcards

Self-Pollination

Pollination that occurs within the same flower, where pollen from the anther fertilizes ovules in the same flower.

Signup and view all the flashcards

Cross-Pollination

Pollination involving the transfer of pollen from the anther of one flower to the stigma of another flower of the same species.

Signup and view all the flashcards

Asexual Reproduction

A type of asexual reproduction producing genetically identical offspring from a single parent, due to the absence of genetic recombination.

Signup and view all the flashcards

Clonal Propagation

The process of creating new plants from the vegetative parts of a parent plant, resulting in genetically identical offspring.

Signup and view all the flashcards

Sexual Reproduction

A mode of reproduction involving the fusion of male and female gametes, resulting in offspring with genetic diversity from both parents.

Signup and view all the flashcards

Spores

Single-celled reproductive units capable of developing into a new organism, commonly found in fungi and certain plants.

Signup and view all the flashcards

Reproductive Parts in Sexual Reproduction

The primary function of reproductive organs in sexual reproduction is the formation of gametes, which are specialized cells involved in fertilization.

Signup and view all the flashcards

Circular Motion

A type of motion where an object moves in a circular path around a fixed point.

Signup and view all the flashcards

Oscillatory Motion

A type of motion where an object repeatedly moves back and forth along a fixed path.

Signup and view all the flashcards

Linear Motion

A type of motion where an object moves in a straight line.

Signup and view all the flashcards

Rectilinear Motion

A type of motion where an object moves along a straight line in a specific direction.

Signup and view all the flashcards

Periodic Motion

A type of motion that repeats itself at regular intervals.

Signup and view all the flashcards

Second

The basic unit of time measurement, defined as the duration of 9,192,631,770 cycles of radiation emitted by cesium-133 atoms.

Signup and view all the flashcards

Kilometer

The standard unit of distance in the metric system, commonly used for measuring larger distances.

Signup and view all the flashcards

Time Period of a Pendulum

The time taken for one complete oscillation of a pendulum, determined by its frequency.

Signup and view all the flashcards

Speed

The rate at which an object changes its position, typically expressed in kilometers per hour (km/h).

Signup and view all the flashcards

Distance

The distance traveled by an object in a specific time interval.

Signup and view all the flashcards

Distance-Time Graph

A graph that depicts the relationship between the distance travelled by an object and the time taken to travel that distance.

Signup and view all the flashcards

Distance-Time Graph for Constant Speed

A straight line on a distance-time graph, indicating that an object is moving at a constant speed.

Signup and view all the flashcards

Distance-Time Graph for Stationary Object

A horizontal line on a distance-time graph, indicating that an object is stationary or not changing its position.

Signup and view all the flashcards

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.

Studying That Suits You

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

Quiz Team

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.

More Like This

Use Quizgecko on...
Browser
Open
Browser
Browser