YR 8 - Biology [Plant Nutrition + Ecosystem]

Question 1

What is the cytoplasm?

Answer 1

The cytoplasm is a jelly like substance in which reactions takes place.

Question 2

What is the chloroplast?

Answer 2

The chloroplasts contain chlorophyll to absorb light energy from the sun.

Question 3

What is the cell wall?

Answer 3

The cell wall is made of cellulose and gives the cell as rigid structure.

Question 4

What is the cell membrane?

Answer 4

The cell membrane controls what enters and leaves a cell.

Question 5

What is the nucleus?

Answer 5

The nucleus is where the genetic material is found.

Question 6

What is the mitochondria?

Answer 6

The mitochondria is where respiration takes place releasing energy from food.

Question 7

What are amoebas?

Answer 7

Amoeba are unicellular organisms that have pseudopods to help them move.

Question 8

What are euglenas?

Answer 8

Euglena are unicellular organisms that have chloroplast s so that they can photosynthesise and produce their own food.

Question 9

What happens during photosynthesis?

Answer 9

During photosynthesis chlorophyll absorbs sunlight and used its energy to convert carbon dioxide and water into glucose. Oxygen is also produced.

Question 10

What is the word equation for photosynthesis?

Answer 10

The word is equation for photosynthesis is:
carbon dioxide + water —> glucose + oxygen.

Question 11

How have leaves adapted to carry out photosynthesis?

Answer 11

Leaves are adapted for carrying out photosynthesis. They are broad, have cells with lots of chloroplast at the top of the leaf and have a stomata on the bottom of the leaf.

Question 12

How do you test a leaf for starch?

Answer 12

To test a leaf for starch you add a few drops of iodine. If starch is present the iodine will change colour from orange to blue black.

Question 13

What is ethanol used for?

Answer 13

Ethanol is used to remove the chlorophyll from a leaf so that you can see a colour change in iodine.

Question 14

What does dropping a leaf into boiling water do?

Answer 14

Dropping a leaf into boiling water breaks down the cell walls and release the contents of the cell so that you can test to see whether starch is present.

Question 15

What do plants do with extra glucose?

Answer 15

Plants store any extra glucose they produce in photosynthesis as starch.

Question 16

How do plants keep healthy?

Answer 16

Plants keep healthy by absorbing mineral nutrients from the soil through their roots.

Question 17

What are nitrates?

Answer 17

Nitrates are minerals used by plants to make protein and help the plant grow (make biomass)

Question 18

What is magnesium?

Answer 18

Magnesium is a mineral used by plants to make chlorophyll.

Question 19

What is the use of fertilisers?

Answer 19

Fertilisers can be added to the soil by gardeners or farmers if the soul is lacking nutrients.

Question 20

What do the arrows in a food chain represent

Answer 20

The arrows in a food chain represent the direction of energy flow.

Question 21

What does a food web contain?

Answer 21

A food web contains many interlinking food chains.

Question 22

What are all plants?

Answer 22

All plants are producers.

Question 23

What is a primary consumer?

Answer 23

A primary consumer is an animal that eats producers.

Question 24

What is a secondary consumer?

Answer 24

A secondary consumer is an animal that eats primary consumers.

Question 25

What are all organisms in a food web?

Answer 25

All organisms in a food web are interdependent - a change in the population of one organism affects the other organisms.

Question 26

How does toxic material affect food webs?

Answer 26

Toxic materials can accumulate (build up) in food webs. The organisms higher up the food chain are the worst affected.