Life Science
Earth Science
Physical Science
continuation 1
continuation 2
200
What are the main components and functions of animal and plant cells?
Plant cells often have a regular shape. They have the same cell components as animal cells: a nucleus, cell membrane, cytoplasm and mitochondria. They also have these extra three as well: Cell wall: a tough outer layer of the cell, which contains cellulose to provide strength and support to the plant.
200
what is the rock cycle?
The Six Rock Cycle Steps
- Weathering & Erosion. Igneous, sedimentary, and metamorphic rocks on the surface of the earth are constantly being broken down by wind and water. ...
- Transportation. ...
- Deposition. ...
- Compaction & Cementation. ...
- Metamorphism. ...
- Rock Melting.
200
define acids and bases.
An acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance. A base is a molecule or ion able to accept a hydrogen ion from an acid. Acidic substances are usually identified by their sour taste.
200
what type of animals are invertibrates?
an invertebrate is a cold-blooded animal with no backbone. Invertebrates can live on land—like insects, spiders, and worms—or in water. Marine invertebrates include crustaceans (such as crabs and lobsters), mollusks (such as squids and clams), and coral.
200
what are the carbon and nitrogen cycles?
Carbon makes its way through living things as carbon-based compounds, like energy molecules, fats and proteins, eventually cycling its way back into the atmosphere. Nitrogen is mainly found in the atmosphere as well and enters the ecosystems as nutrients for plants.
400
define metabolism.
the chemical processes that occur within a living organism in order to maintain life.
400
how do you determine absolute vs. relative age?
Relative age is the age of a rock layer (or the fossils it contains) compared to other layers. It can be determined by looking at the position of rock layers. Absolute age is the numeric age of a layer of rocks or fossils. Absolute age can be determined by using radiometric dating.
400
what is a physical vs. chemical change?
Remember that a physical change is a change in properties such as texture, shape, or state, while a chemical change represents the formation of a new substance after atoms are rearranged in a chemical reaction.
400
define bulbs, runners, and tubers.
Bulbs - underground food storage organs with fleshy leaves that store food and can grow and develop into new plants, eg onions and garlic. Runners - horizontal stems, eg strawberry or spider plants. Tubers - underground food stores.
400
what are the 3 R's in resource conservation?
Replacement, Reduction, and Refinement
600
define biotic and abiotic factors?
Biotic factors are living things within an ecosystem; such as plants, animals, and bacteria, while abiotic are non-living components; such as water, soil and atmosphere.
600
what causes day and night?
The Earth orbits the sun once every 365 days and rotates about its axis once every 24 hours. Day and night are due to the Earth rotating on its axis, not its orbiting around the sun. The term 'one day' is determined by the time the Earth takes to rotate once on its axis and includes both day time and night time.
600
What are waves in the Electromagnetic spectrum?
The electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, X-rays, and gamma-rays.
600
define mosses and ferns.How do they differ?
Definition. Mosses: Mosses are small, nonvascular plants that do not have a true root, stem, and leaves and reproduce by the production of spores in stalked capsules. Ferns: Ferns are flowerless, vascular plants with leafy fronds that mainly reproduce by the production of spores.The main difference between mosses and ferns is that mosses are non-vascular plants whereas ferns are vascular plants. Furthermore, the plant body of ferns is differentiated into true leaves, stem, and roots. In contrast, the plant body of mosses consists of less differentiated leaflets.
600
define conduction,convection,and radiation.
conduction: the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.
convection: the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.
radiation:Radiation is energy that comes from a source and travels through space at the speed of light. This energy has an electric field and a magnetic field associated with it, and has wave-like properties. You could also call radiation “electromagnetic waves”.
800
what are the main parts and functions of the skeletal and muscular system?
The bones of the skeletal system protect the body's internal organs, support the weight of the body, and serve as the main storage system for calcium and phosphorus.
800
what are the main layers of the atmosphere?
Earth's atmosphere has five major and several secondary layers. From lowest to highest, the major layers are the troposphere, stratosphere, mesosphere, thermosphere and exosphere.
800
define photon and lasers.
The electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, X-rays, and gamma-rays.
800
define igneous, sedimentary, and metemorphic rocks.
Igneous rocks are formed from melted rock deep inside the Earth. Sedimentary rocks are formed from layers of sand, silt, dead plants, and animal skeletons. Metamorphic rocks formed from other rocks that are changed by heat and pressure underground
800
What are SONAR,Doppler effect,and echolocation?
SONAR: a system for the detection of objects under water and for measuring the water's depth by emitting sound pulses and detecting or measuring their return after being reflected.
Doppler effect: an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move toward (or away from) each other. The effect causes the sudden change in pitch noticeable in a passing siren, as well as the redshift seen by astronomers.
echolocation:the location of objects by reflected sound, in particular that used by animals such as dolphins and bats.
1000
what are warm-blooded vs. cold-blooded animals?
Cold-blooded animals are the animals that are not capable of regulating their body's temperature according to the temperature of the surrounding. Warm-blooded animals are the animals that are capable of maintaining a nearly constant body temperature irrespective of the temperature of the environment.
1000
define land breeze and sea breeze.
Land Breeze is defined as a breeze which moves towards the sea from the land. Sea Breeze is defined as a breeze which moves towards the land from the sea.
1000
Define magnetic fields and electromagnet.
electromagnetic field, a property of space caused by the motion of an electric charge. A stationary charge will produce only an electric field in the surrounding space. If the charge is moving, a magnetic field is also produced. An electric field can be produced also by a changing magnetic field.
1000
define spring and neap tides.
Rather, the term is derived from the concept of the tide "springing forth." Spring tides occur twice each lunar month all year long without regard to the season. Neap tides, which also occur twice a month, happen when the sun and moon are at right angles to each other.
1000
define electric circuit and short circuit.
elecrtric circuit: the location of objects by reflected sound, in particular that used by animals such as dolphins and bats.
short circuit: in a device, an electrical circuit of lower resistance than that of a normal circuit, typically resulting from the unintended contact of components and consequent accidental diversion of the current.