bib

?
What are root hair cells specialised for?
absorbing water and minerals
1 of 38
What do the cells do on the surfaces of a root hair cell?
they grow into long hair which stick out into the soil
2 of 38
What do the hairs do on a root hair cell?
they create a big surface area for absorbing water and mineral ions from the soil
3 of 38
How do root hair cells take in minerals?
using active transport
4 of 38
Where is the concentration higher in the root hair cell or the soil around it?
in the root hair cell
5 of 38
What is active transport?
allows cells to take in substances against a concentration gradient, uses energy from respiration
6 of 38
What does active transport allow plants to do?
absorb minerals from a very dilute solution, against a concentration gradient, this is essential for its growth
7 of 38
In what circumstance is active transport used in the gut?
when there is a low concentration of nutrients in the gut but a high concentration in the blood
8 of 38
Flowering plants have two types of seperate vessels what are they called?
xylem and phloem
9 of 38
What do the phloem tubes do?
they transport food substances made in the leaves to growing regions and storage organs of the plant, they flow in both directions
10 of 38
What are phloem tubes made of?
columns of living cells with smalls holes in the ends to allow stuff to flow through
11 of 38
What do the xylem tubes do?
they carry water and minerals from the roots to the stem and leaves in the transpiration stream
12 of 38
What are the xylem tubes made up of?
dead cells joined end to end with no end walls between them and a hole down the middle
13 of 38
What is transpiration?
loss of water from the plant
14 of 38
What is transpiration caused by?
evaporation and diffusion of water from inside the leaves
15 of 38
During traspiration whats happens to the amount of water?
there is a shortage of water in the leaves and so water is drawn up from the rest of the plant through the xylem vessels to replace it, so there is a constant transpiration stream of water
16 of 38
Why is the population rising?
due to modern medicine and farming methods which reduces death rate from disease and hunger
17 of 38
Why do humans put pressure on the enviroment?
because they are demanding a higher standard of living , so we use more raw materials from resources and use more enerfy from the manufacturing process
18 of 38
How is human activity affecting the water?
sewage and toxic chemicals from industry polutes the waters, which affect nature which we rely on to survive
19 of 38
How is human activity affecting the land?
use toxic chemicals for farming, we bury nuclear waste underground, and dump things on landfill sites
20 of 38
How is human activity affecting the air?
smoke and gases released into the atmosphere can pollute the air
21 of 38
What are the four main human activities that use up land?
farming, building, dumping waste and quarrying for metal ores
22 of 38
What can carbon dioxide be locked up in?
oceans, lakes and ponds, green plants where its stored as carbon compounds and peat bogs
23 of 38
What does the gas in the air natually act like?
an insulating layer
24 of 38
What are the name of the gases that help keep the heat in?
greenhouse gases
25 of 38
What are two greenhouses gases that we worry about and why?
carbon dioxide and methane, because they are rising
26 of 38
What is global warming a type of?
climate change
27 of 38
What is the purpose of deforestation?
provides timber, clear land for farming, produce paper
28 of 38
What is the four main problems deforestation leads to?
more methane and Co2 in the atmosphere, less Co2 taken in and less biodiversity
29 of 38
What is biodiversity?
the variety of different species in a habitat
30 of 38
What are bogs?
the areas of land that are acidic and waterlogged
31 of 38
What are the two main types of biogas generators?
batch generators and continuous generators
32 of 38
What are batch generators?
they make biogas in small batches, they are manually loaded up with waste, which is left to digest, and the by-products are cleared away at the end
33 of 38
What are continuous generators?
they make biogas all the time, waste is continually fed in, and biogas is produced at a steady rate, more suited to large scale products
34 of 38
What three things does a simple biogas generator need to have?
an inlet for waste material to be put in, and outlet for the digested material to be removed through, and an outlet so that the biogas can be piped to where it is needed
35 of 38
What are the four factors to consider when designing a generator?
cost, convinience, efficiency and position
36 of 38
Why are biofuels better than fossil fuels?
they dont produce a significant amount of sulfer dioxide and nitrogen dioxide, doesnt release greenhouse gases, cheap and availiable, good fertiliser
37 of 38
What are some of the consequences of global warming?
sea levels rise, changed weather patterns, distribution of animals and plants may change, biodiversity reduced, extinction
38 of 38

Other cards in this set

Card 2

Front

What do the cells do on the surfaces of a root hair cell?

Back

they grow into long hair which stick out into the soil

Card 3

Front

What do the hairs do on a root hair cell?

Back

Preview of the front of card 3

Card 4

Front

How do root hair cells take in minerals?

Back

Preview of the front of card 4

Card 5

Front

Where is the concentration higher in the root hair cell or the soil around it?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Biology resources:

B3d-f
B3a-c
See all Biology resources »