Reproduction in Animals

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson
Download our mobile app to listen on the go
Get App

Questions and Answers

Which type of reproduction involves only one parent?

  • Sexual reproduction
  • Asexual reproduction (correct)
  • Both sexual and asexual reproduction
  • None of the above

Sexual reproduction results in offspring that are genetically identical to their parents.

False (B)

What are the stages in the life cycle of a frog?

Tadpole, metamorphosis, adult frog

Friction is a force that opposes ______ between surfaces in contact.

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

Which of the following methods can help reduce friction?

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

Kinetic friction acts on a stationary object.

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

What is the difference between static and kinetic friction?

<p>Static friction prevents an object from moving; kinetic friction opposes motion of a moving object.</p> Signup and view all the answers

Match the type of friction with its example:

<p>Sliding friction = Sliding a box across the floor Rolling friction = Rolling a bowling ball Static friction = Pushing a heavy object that does not move Kinetic friction = Dragging a chair across a carpet</p> Signup and view all the answers

Flashcards

Asexual Reproduction

Reproduction that involves only one parent, resulting in offspring genetically identical to the parent.

Sexual Reproduction

Reproduction involving two parents, resulting in genetically varied offspring.

Internal Fertilization

Fertilization that occurs inside the female's body.

External Fertilization

Fertilization that happens outside the female's body.

Signup and view all the flashcards

Metamorphosis (Frog)

Transformation from tadpole to adult frog.

Signup and view all the flashcards

Tadpole

The larval stage of a frog, living in water.

Signup and view all the flashcards

Friction

Force opposing motion between surfaces in contact.

Signup and view all the flashcards

Static Friction

Friction that prevents an object from moving.

Signup and view all the flashcards

Kinetic Friction

Friction acting on a moving object.

Signup and view all the flashcards

Sliding Friction

Friction when two surfaces slide past each other.

Signup and view all the flashcards

Rolling Friction

Friction when an object rolls.

Signup and view all the flashcards

Reproduction

Biological process where offspring are produced from parents.

Signup and view all the flashcards

Study Notes

Reproduction in Animals

  • Reproduction is the biological process by which new individual organisms – "offspring" – are produced from their "parents".
  • Two main types of reproduction are:
    • Asexual reproduction: involves only one parent and results in offspring that are genetically identical to the parent. Common methods include binary fission, budding, fragmentation, and vegetative propagation.
    • Sexual reproduction: involves two parents and results in offspring that exhibit genetic variation from their parents. The process commonly involves the fusion of male and female gametes (sex cells).
  • Examples of asexual reproduction in animals include budding in hydra and fragmentation in starfish.
  • Examples of sexual reproduction in animals include internal fertilization (e.g., mammals, birds) and external fertilization (e.g., fish, amphibians).
  • Internal fertilization occurs inside the body of the female, whereas external fertilization takes place outside the body of the female.

Stages in the life cycle of a frog

  • Frogs undergo metamorphosis, transforming from tadpoles to adult frogs.
  • Tadpoles are born in water and have gills.
  • They undergo a series of changes such as the development of lungs and legs.
  • Finally adult frogs live on land and have lungs to breathe.

Friction

  • Friction is a force that opposes motion between surfaces in contact.
  • It arises due to the irregularities at the microscopic level of contacting surfaces.
  • Friction can be either static or kinetic.
  • Static friction prevents an object from moving when a force is applied. Its value is adjusted to match the applied force up to a maximum before the object begins to slide.
  • Kinetic friction acts on a moving object and opposes the direction of motion.
  • Factors affecting friction include:
    • Nature of the surfaces (rough surfaces have higher friction than smooth surfaces).
    • Force pressing the surfaces together (greater force results in higher friction).
  • Friction can be helpful (e.g., walking, writing, braking in vehicles); however, it can also be a source of energy loss (e.g., wear and tear on machines).
  • Methods to reduce friction include using lubricants (e.g., oil, grease), ball bearings, and streamlining.

Types of Friction

  • Sliding friction: Occurs when two surfaces slide past each other. Examples include sliding a box across the floor or dragging a chair across a carpet.
  • Rolling friction: Occurs when an object rolls across a surface. Examples include a wheel rolling on the ground or a ball rolling down a hill. Rolling friction is generally less than sliding friction.
  • Fluid friction: Occurs when an object moves through a fluid (liquid or gas). Examples include swimming, flying, or sailing. Fluid friction depends on the shape and speed of the object.

Reducing Friction

  • Using lubricants: Applying substances like oil or grease to reduce friction between surfaces.
  • Using ball bearings: Replacing sliding surfaces with ball bearings reduces the amount of friction.
  • Streamlining: Shaping objects to reduce air or water resistance and consequently reduce friction.
  • Using wheels or rollers: Rolling objects use less force than sliding and therefore experience less friction.

Studying That Suits You

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

Quiz Team

More Like This

Use Quizgecko on...
Browser
Browser