unit 2, topic 1

Question 1

what is fibre

Answer 1

the tissue of plants stems, leaves, seeds or roots

Question 2

how do humans use plants

Answer 2

humans use plants for clothing paper and building materials.

Question 3

why are plants critical to the ecosystem

Answer 3

because they produce oxygen that most organisms need to live

Question 4

because industries excess carbon dioxide and pollutants to the atmosphere what do plants use do to prevent this

Answer 4

they use carbon dioxide because they breathe in carbon dioxide and let out oxygen.

Question 5

plants are the basis of most…

Answer 5

food webs

Question 6

what are the three reasons why plants are important

Answer 6

1. they provide shelter for countless animals.
2. plants help clean and filter water and absorb it.
3. the roots of the plants help help soil in place and prevent it from being washed or blown away.

Question 7

How many trees does it take to absorb the carbon dioxide from a car driven for one hour?

Answer 7

it takes four large trees to absorb the excess carbon dioxide put into the atmosphere when a car is driven four one hour,

Question 8

today 75 percent of the world’s food supply is based on seven major crops..

Answer 8

1. wheat
2. rice
3. maize (corn.)
4. potatoes
5. barley
6. cassava
7. sorghum.`

Question 9

silk is the most

Answer 9

expensive fibre in the world.

Question 10

what are the three natural fibres we use

Answer 10

cotton, hemp, and flax

Question 11

what are the two manufactured fibres

Answer 11

polyester or nylon

Question 12

what is cotton?

Answer 12

cotton is a natural fibre that has been grown and used by humans for centuries. Cotton fibres come from the plant’s seed. The fibres are strong , flexible and gradually spiral that causes the strands to interlock when twisted

Question 13

what is hemp

Answer 13

Hemp is the oldest cultivated plant in the world. Hemp has less negative effect on the environment than other sources of fibre do.

Question 14

what is flax

Answer 14

Flax is a food and fibre crop that is grown in the northern, cooler regions of the world. Flax fibres are taken from the stem of a plant and are two to three times strong as those of cotton. Flax fibre is also used for making linen paper.

Question 15

What does the common silkworm eat?

Answer 15

they eat the leaves of a mulberry tree that provide the stable food of the common silkworm

Question 16

Where does the word “denim” come from?

Answer 16

the word denim came from the French name material, serge de nimes, soon turned into the word “denim” in North America

Question 17

more than________ medicines are made from plants

Answer 17

7000

Question 18

what are some medicines that are made from plants

Answer 18

heart drugs, cancer medicines, antibiotics, and pain medicines

Question 19

plants often give us the __________ for medicines that scientists can then copy in laboratories

Answer 19

“blueprints”

Question 20

what is morphine

Answer 20

a powerful pain medicine is found only in the thick fluid of the opium poppy’s seed pot , it cannot be manufactured

Question 21

what is quinine

Answer 21

comes from cinchona trees it is used in prevention odd malaria, a deadly disease carried by certain tropical mosquitoes.

Question 22

Where does softwood come from? Where do hardwoods come from?

Answer 22

Softwood comes from coniferous trees, and hardwood comes from broad-leaved, deciduous trees.

Question 23

what are the different uses for plants

Answer 23

Environment
Food
Fibre
Medicine 
Transportation

Question 24

what are some example for plants for food

Answer 24

Apple
oranges
bananas

Question 25

what are some example of plants for fibre

Answer 25

``` cotton silk flax wool linen ```

Question 26

What advantages does hemp have over other fibre plants such as wood and cotton?

Answer 26

Hemp has a less negative effect in the environment than other sources of fibre do.

Question 27

Name two ways plants are used in transportation.

Answer 27

Rubber- is made out of latex, that is hard and flexible so it can be a very good tool for transportation Wood- wood is one way of transportation because it is used for boats, and many people use boats to travel.