biology y9

Question 1

What is magnification?

Answer 1

Imagine divided by Actual size

Question 2

What do ribosomes?

Answer 2

Protein-syenthesis

Question 3

What does the cell membrane do?

Answer 3

Control movement of liquid in and out of the cell

Question 4

What does the cell wall do?

Answer 4

Provides support and strength for the cell.

Question 5

What does the nucleas do?

Answer 5

It stores genetic material (DNA) and control cell activity

Question 6

What does the mitrochondria do?

Answer 6

It provides energy for the cell through respiration

Question 7

What does the cytoplasm do?

Answer 7

Where most chemical reactions take place.

Question 8

What is a partialy perm-able membrane?

Answer 8

Something that only allows certain substances through.

Question 9

What is osmois?

Answer 9

The movement of water molecules across a partially perm-able membrane. From a concertrated solution to a dialute solution.

Question 10

What is diffusion?

Answer 10

The movement of particles from a high concertration to a low concertration

Question 11

What do both plant cells and animal cells have?

Answer 11

cell membrane , mitchrondria , ribosomes , nucleas and cytoplasm.

Question 12

What features does a plant cell have that a animal cells does not?

Answer 12

Chloropast , Cell Wall and Vacuole.

Question 13

What is active transport?

Answer 13

The movement of substances between their against their concertration gradient using energy from respiration.

Question 14

When is active transport useful in plant cells/animal cells?

Answer 14

In animal cells, it is used in the gut to absorb nutrients from our food.

In plant cells, Root hair cells absorb minerals from the soil.

Question 15

How are sperm cells specialised?

Answer 15

They have a long tail, stream lined head, lots of mitrochondria and enzymes to help digest the cell membrane of a egg cell. (All for reporduction)

Question 16

How are nerve cells specialised?

Answer 16

They are in loops and have send electrical impulses to make connections. (For rapid signalling.)

Question 17

How is a muscle cell specialised?

Answer 17

They contain lots of mitrochondria so they can release energy for respiration. (For contracting)

Question 18

How is a root hair cell specialised?

Answer 18

They have hairs that increase their surface area. (For absorbing water and minerals)

Question 19

How is a phyloem and Zylumn cell specialised?

Answer 19

Zylumn cells are hollow in the centre and Phyloem cells have very conjointed stems so that subtances can feed through them.

Question 20

Give a example of a eukoryotic cell and a prokrayotic cell

Answer 20

For Euckoryotic, The Phyloem cell.

For Prokayrotic, The bacteria cell.

Question 21

What is a stem cell?

Answer 21

A cell that has not been specialised. It can be found in the early human embyro.

Question 22

Why are people against stem cell research?

Answer 22

People think its unethical to kill human embroys and they believe that they are playing “god”.

Question 23

What are the benifits of stem cell research?

Answer 23

Helps us develop medicine and can produce identitcal plants.

Question 24

How are alveoli adapted to maximise defusion?

Answer 24

They have a large surface area , Tight walls and lots of capilaries.

Question 25

How are leafes adapted to maximise defusion?

Answer 25

They have stimarters which allow gases to travel easily, guard cells and a flat shape.

Question 26

is tiggez animal cell

Answer 26

yess!!!!

Question 27

How is mitosis happen?

Answer 27

1. Cell division and replication
2. The chromozones line up on the cell and they are pulled apart to the ends of the cell.
3. Mitrochondria form around these chromozomes and become the nucleas of the 2 new cells.
4. The cytoplasm and the cell membrane divide.
5. The cell now has 2 identitcal daughter cells