1 - 10 van 17 bronnen weergeven

Biodiversity and natural selection

Patterns and processes of evolution. How evolution and natural selection are reflected in the similarities and differences of organisms. 

Onderwerp en thema
Form 2
Biology
Balance of nature
The natural environment
Type bron
Video
Taal
English
Uitgever
California Academy of Sciences
Publicatiedatum
2014
Schepper/Auteur
California Academy of Sciences
Trefwoord
Biodiversity
Natural selection

Cell theory

Introduction to cell theory--the idea that 1) all living things are made of one or more cells, 2) cells are the basic unit of life and 3) all cells come from other cells. Explore the roles that Hooke, Leeuwenhoek and others played in developing cell theory.

Hooke and Leeuwenhoek were two of the first scientists to use microscopes to study the microscopic world of cells. Hooke coined the term "cell" after observing the tiny compartments in cork, while Leeuwenhoek discovered a variety of living creatures in pond water, blood, and other samples. They contributed to the cell theory by suggesting that cells are the fundamental units of life and structure, and that all living things consist of one or more cells that originate from other cells by division. 

Onderwerp en thema
Form 1
Biology
Cell structure and organisation
Concept of cells
Type bron
Video
Taal
English
Uitgever
Khan Academy
Publicatiedatum
2015
Schepper/Auteur
Sal Khan
Trefwoord
Cells

Cells and organisms

All living things are made up of cells, which is the smallest unit that can be said to be alive. An organism may consist of one single cell (unicellular) or many different numbers and types of cells (multicellular).

Onderwerp en thema
Form 1
Biology
Cell structure and organisation
Concept of cells
Type bron
Video
Taal
English
Uitgever
Khan Academy
Publicatiedatum
2022
Schepper/Auteur
Khan Academy
Trefwoord
Cells

Comparing animal and plant cells

Plant cells have a cell wall in addition to a cell membrane, whereas animal cells have only a cell membrane. Plants use cell walls to provide structure to the plant. Plant cells contain organelles called chloroplasts, while animal cells do not. Chloroplasts allow plants to make the food they need to live using photosynthesis.

Onderwerp en thema
Form 1
Biology
Cell structure and organisation
Plant and animal cells
Type bron
Video
Taal
English
Uitgever
Khan Academy
Publicatiedatum
2022
Schepper/Auteur
Khan Academy
Trefwoord
Animal cell
Plant cell

Forces and Motion: Basics

  • Identify when forces are balanced vs unbalanced.
  • Determine the sum of forces (net force) on an object with more than one force on it.
  • Predict the motion of an object with zero net force.
  • Predict the direction of motion given a combination of forces.
Onderwerp en thema
Form 2
Physics
Motion in a straight line
Distance and displacement
Type bron
Simulatie
Taal
English
Uitgever
pHET Interactive Simulations
Publicatiedatum
No date
Schepper/Auteur
Noah Podolefsky (Lead)
Trefwoord
Force
Motion
Friction
Speed

Impact velocity from given height

Determining how fast something will be traveling upon impact when it is released from a given height. 

Onderwerp en thema
Form 2
Physics
Motion in a straight line
Distance and displacement
Type bron
Video
Taal
English
Uitgever
Khan Academy
Publicatiedatum
2011
Schepper/Auteur
Sal Khan
Trefwoord
Initial Velocity
One dimensional motion

Introduction to the cell

Introduction to the cell.

Onderwerp en thema
Form 1
Biology
Cell structure and organisation
Concept of cells
Type bron
Video
Taal
English
Uitgever
Khan Academy
Publicatiedatum
2017
Schepper/Auteur
Sal Khan
Trefwoord
Cells

Matter and energy in food webs

Food webs are models that demonstrate how matter and energy is transferred between producers, consumers, and decomposers as the three groups interact within an ecosystem. Transfers of matter into and out of the physical environment occur at every level. Decomposers recycle nutrients from dead plant or animal matter back to the soil in terrestrial environments or to the water in aquatic environments. The atoms that make up the organisms in an ecosystem are cycled repeatedly between the living and nonliving parts of the ecosystem.

Onderwerp en thema
Form 2
Biology
Balance of nature
Food chain and food web
Type bron
Video
Taal
English
Uitgever
Khan Academy
Publicatiedatum
2022
Schepper/Auteur
Sal Khan
Trefwoord
Food webs

Motion in Two Dimensions

In this chapter, we’ll use vectors to expand our understanding of forces and motion into two dimensions. Most real-world physics problems (such as with the game of pool pictured here) are, after all, either two- or three-dimensional problems and physics is most useful when applied to real physical scenarios. We start by learning the practical skills of graphically adding and subtracting vectors (by using drawings) and analytically (with math). Once we’re able to work with two-dimensional vectors, we apply these skills to problems of projectile motion, inclined planes, and harmonic motion.

Onderwerp en thema
Form 2
Physics
Motion in a straight line
Distance and displacement
Type bron
Studieboeken
Taal
English
Uitgever
openstax
Publicatiedatum
2020
Schepper/Auteur
Openstax
Trefwoord
Resultant
Resultant vector
Tail
Graphical method

Overview of animal and plant cells

Overview of animal and plant cells. Topics include cell walls, vacuoles, chloroplasts, peroxisomes, lysosomes, mitochondria, etc.

Onderwerp en thema
Form 1
Biology
Cell structure and organisation
Plant and animal cells
Type bron
Video
Taal
English
Uitgever
Khan Academy
Publicatiedatum
2015
Schepper/Auteur
Sal Khan
Trefwoord
Animal cell
Plant cell