Whole Of B4

Question 1

How do plants use glucose

Answer 1

Respiration
Converted to cellulose to make cell wall
Protein for growth and repair

Question 2

What is the 2 stage process for photosynthesis and how does choroplast work

Answer 2

Water split by light energy releasing O2 gas and hydrogen ions / CO2 gas combines with hydrogen ions producing glucose and water

Choroplast contain chroplly which absorbs sunlight and coverts co2 and water to glucose

Question 3

Things that increase photosynthesis

Answer 3

More co2
More light
And high temperature

Question 4

Things that limit rate of photosynthesis is called

Answer 4

Limiting factor

Question 5

How are leaves adapted for plant (epidermes)

Answer 5

Outer Epidermis is transparent due to less choroplast so less light

Upper palisade contains lots of choroplast so it gets light

Spongy mesoply cells are loosely spaced so diffusion happens

Question 6

Leaves adaption

Answer 6

Have big surface area for more light

Thin so gases can diffuse easily and light get to cell

Contains cytoplast so it absorbs light vascular bundles for transport of chemicals like water and glucose

Question 7

What are plants made of and what’s the equation for photosynthesis

Answer 7

Plants made from stem root and leaf

6CO2+6H2O=C6 H12 O6 + 6O2

Question 8

What is diffusion

Answer 8

When gas or liquid move from high concentration to low concentration

The bigger the difference in concentration the faster the diffusion rate

Question 9

Rate of diffusion can be increased by

Answer 9

Short distances for molecules to travel

Large surface area so more substance can diffuse

Question 10

What is osmosis and the consequence of it

Answer 10

Osmosis is the net movement of water molecules from permeable memberane from higher water concentration to lower water concentration

Osmosis is consequence of random movement of water molecules

Question 11

What does phloem do and what are they made from

Answer 11

Carry food to plants both ways

Made from living cells with small holes so stuff flows

Question 12

What does xylem do and what’s it made from

Answer 12

Takes water up to plant

Made from dead cells

Xylem have hollow lumen phloem don’t hollow Lumen

Question 13

Tranpiration ensures that

Answer 13

Plants have water for cooling , evaporation , photosynthesis

Question 14

Transpiration is when

Answer 14

Evaporation and diffusion of water inside leaves

Question 15

Rate of transpiration can be increased by

Answer 15

More air movement
Increase in temperature
And more light

Question 16

How are leaves adapted to reduce water loss by

Answer 16

They have guard cells which change size of stomatal opening

Question 17

Why do organisms and waste products decay

Answer 17

Because they are broken down by decomposers like microorganism

Question 18

Which conditions do microorganism work best when

Answer 18

Moist and warm with lots of o2

Question 19

What do detritus feed on and give an example some

Answer 19

They feed on dead material. E.g are woodlice and maggots they break up material to small bits giving them big surface area to speed up decay

Question 20

What are saprophytes

Answer 20

They feed on dead material E.g are fungi

Question 21

Why are good preservation done

Answer 21

So it stops decomposition of our food

Canning to stop them from coming in
Cooling to slow down decomposers

Question 22

Name minerals plant need And the job of it

Answer 22

Nitrogen for growth of cell
Phosphate respiration
Pottasium for photosynthesis
Magnesium for respiration

Question 23

Name what the consequence of lack of each mineral is

Answer 23

Nitrogen no growth and yellow leaves

Phosphate discoloured leaves and no growth

Pottasium discoloured leaves

Magnesium yellow leaves

Question 24

What’s the process called when minerals are absorbed by root hair cell

Answer 24

Active transport

Question 25

What does active transport do

Answer 25

They carry soil in low concentration to root cells containing high minerals

Question 26

Why are pesticides bad

Answer 26

Enter food chains causing lethal dose to predators and it could harm organisms

Question 27

What is organic farming

Answer 27

When u use animal manure rather than fertilisers also they use crop rotation

Question 28

What is crop rotation

Answer 28

When you grow different crops so it stops diseases of one crop building up and stops nutrients running out

Question 29

Advantage and disadvantage of organic farming

Answer 29

Less chemicals
Doesn’t cause pollution to Rivers

More harder
Takes space
Can’t grow as much crops

Question 30

What is biological control

Answer 30

When we use species to eat other species that cause problems to farming e.g we use ladybirds to eat aphids as the eat plants

Question 31

Ad and disadvantage of biological control

Answer 31

No need to repeat it
No chemical used

Ladybird could increase in population
It could not eat the pest
It could eat useful species e.g pollinaters

Question 32

What are hydroponic

Answer 32

We use it to grow plants without soil and hydroponics is regulated with aerated water contains minerals they are good cause they have better control over minerals leaves and diseases

Bad cause have lack of support for tall plants