Science Grade 7 Chapter 2
Terms
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- Earth's early atmosphere was changed dramatically by the evolution of:
- photosynthesis
- The theory that life could spring from nonliving matter is called:
- spontaneous generation
- The building up and breaking down of chemical substances necessary for life is called:
- metabolism
- The complex compound that carries the information needed to make proteins is:
- DNA
- The struggle among living things to obtain the resources needed for survival is called:
- competition
- A substance made of a single element?
- diamond
- Carbohydrate is to glucose as:
- protein is to amino acid
- The process of combining oxygen with the products of disgestion to produce energy is called:
- respiration
- Planet Earth is how old?
- 4.6 Billion Years
- The theory of spontaneous generates states that life can spring from nonliving matter.
- True
- The process by which an organism puts food into its body is:
- ingestion
- Green plants produce what waste product during photosynthesis?
- oxygen
- Process of getting rid of body wastes is called:
- excretion
- Inorganic compound examples:
- ammonia and water
- Carbohydrates include sugars and starches. (True or False)
- True
- Metabolism
- The sum of all chemical activites essential to life.
- A change in the environment to which all living things reacts is:
- stimulus
- The reaction to stimulus is called a:
- response
- There are two kinds of reproduction?
-
asexual - one
sexual - two - Living things need _____ for metabolism.
- energy
- The primary source of energy for almost all living things is the:
- SUN
- Homeostasis
- The ability of an organism to keep conditions constant inside its body when the outside environment changes.
- Inorganic compounds
- Do not contain the element carbon.
- Organic compounds
- Do contain carbon.
- The organic compounds important to life are:
- carbohydrates, fats and oils, proteins, enzymes, and nucleic acids.
- DNA
- is considered the "Blueprint" for life as it directs the development of an organism's offspring.
- All living things are made of small units called:
- cells
- Ability to move through the environment is important to all living things to find:
- food, shelter and protection.
- Life Span
- the maximum length of time a particular organism can be expected to live.
- Warm Blooded Animals
- Maintain a constant body temperature. Can be active both day and night and in hot and cold weather. (Dogs, Birds - pant, horses - sweat)
- Cold Blooded Animals
- Body temperature changes with the environment. Reptiles and Fish.
- element
- a pure substance that cannotbe broken down into any simpler/smaller substance. (Ex: diamond)
- compounds
- when two or more elements are chemically joined together. (Ex: Table salt which is sodium and chlorine)
- enzymes
- a special type of protein that regulates chemical activities within the body.
- Nucleic Acid
- organic chemicals such as: DNA (carries message) and RND (reads message). DNA is the blueprint of life.