science unit B

Question 1

list 4 basics needs of life or living things

Answer 1

sunlight , food , water , oxygen

Question 2

define adaptation

Answer 2

an adaptation is an inherited characteristic that helps an organism survive and reproduce in it’s environment

Question 3

4 levels of organization of interactions

Answer 3

organism - 1 individual, 1 species

population - many individuals of one species

community - many populations

ecosystem - biotic and abiotic

Question 4

commensalism relationship

Answer 4

+ 0

Question 5

mutualism

Answer 5

+ +

Question 6

parasitism

Answer 6

+ -

Question 7

Definition of yield

Answer 7

The amount of useful plants per plant

Question 8

What is a Hydroponic system

Answer 8

Plants are grown without soil. Instead, the roots of the plant are buried in gravel or coarse sand. Nutrient rich water is then pumped through this material at regular intervals

Question 9

One example of an artificial environment

Answer 9

Green houses are one example of an artificial environment. Plants in a greenhouse always have the right temperature light and nutrients for their needs

Question 10

Definition of species

Answer 10

A group of organisms with similar traits that can reproduce with each other.

Question 11

Definition of variety

Answer 11

A variety have specific characteristics, or traits, that distinguish it from other varieties.

Question 12

What is selective breeding

Answer 12

The process of selecting plants with specific traits and reproducing them.

Question 13

What is genetic engineering

Answer 13

A process in which single genes are added to a plant cells

Question 14

What is a gene

Answer 14

A gene is a tiny piece of material in a cell nucleus

Question 15

Can varieties cause problems

Answer 15

Yes varieties have useful traits, they may also require more fertilizer or other special treatments

Question 16

What is a pesticide? Can there be negative effects of pesticides?

Answer 16

Substances that kill insects are called pesticides. Pesticides can sometimes kill helpful insects as well such as those that pollinate crops. If pesticides are used for a long time some insects will become more resistant.

Question 17

What is biological control?

Answer 17

Biological control tries to copy the way that Population size is controlled and natural environments. Sometimes a natural predator is used to control a pest

Question 18

What are some consequences of environmental management?

Answer 18

Somethings you thought may be a good thing may be actually harmful.

Question 19

What is the definition of environmental management?

Answer 19

Environmental management is balancing the needs of humans with the needs of the environment.

Question 20

What is monoculture?

Answer 20

When one field is used to support growth of just one variety of plant.

Question 21

What does sustainable mean?

Answer 21

When a plant is growing at the perfect speed. You never have too much or too little of the plant.

Question 22

Organic VS chemical fertilizer

Answer 22

Chemical fertilizer has mineral particles in it that are made from rock that is been broken down.
Organic fertilizer has organic particles in it that are made from plants and animals that were once living

Question 23

What are the three types of soil and what are their characteristics?

Answer 23

Sandy soil – sandy soil runs between your fingers and has very few lumps if a wet Sandy soil will still not stay together
Clay soil – clay soil feel slippery when it is wet if squeezed when wet it will stay together
Loam soil – loam soil is crumbly like a moist cake. If squeezed when wet loam soil will form a loose ball

Question 24

Fertilizers beneficial effects and harmful effects

Answer 24

Beneficial – the soil nutrients that plants need can be provided by fertilizers. organic fertilizers are made from sources such as animal or plant waste. chemical fertilizers are mixtures of types of chemicals that promotes plant growth
Harmful effect – if you use too much fertilizer more nutrients can be added then the plant needs this may harm the plant