B1-B9 second half

Question 1

which tissue type would u find in a leaf and what are their jobs

Answer 1

several layers of different tissue types:

1. Pith
2. Protoxylem
3. Xylem I
4. Phloem I
5. Sclerenchyma (bast fibre)
6. Cortex
7. Epidermis

Question 2

whats transpirations + transpiration stream ?

Answer 2

transpiration = the exhalation of water vapour through the stomata.

transpiration stream = the flow of water through a plant, from the roots to the leaves, via the xylem vessels.

Question 3

what factors increase the rate of transpiration ?

Answer 3

temperature (because water evaporates quicker) , air movement and light intensity

Question 4

communicable ?

non-communicable diseases

Answer 4

communicable = disease that spreads e.g corona , HIV , measles

non-communicable = doesnt spread e.g cancer , strokes amd parkinsons

Question 5

how do white blood cells protect us against pathogens ?

Answer 5

they release anti-toxins

they ingest the pathogens

Question 6

what is in a vaccine , how do they work ?

Answer 6

contain at least one antigen from the bacteria or virus

triggers an immune response

Question 7

how do antibiotics work

Answer 7

Antibiotics are chemotherapeutic substances - can kill microorganisms such as infections or fungi

Question 8

whats a double blind trial and when would it be used ?

Answer 8

the participants nor the researcher knows which treatment or intervention participants are receiving until the clinical trial is over. This makes results of the study less likely to be biased.

Question 9

how would a greenhouse tomato grower maximise his profit ?

Answer 9

the greenhouse increases the rate of photosynthesis meaning the plants grow quicker - mighr also meed to regulate the temperatire

Question 10

where and how is glucose made by a plant ?

how does the plant use it

Answer 10

through photosynthesis - This process takes place in the leafs chloroplasts.

Question 11

whats the equation for photosynthesis ?

Answer 11

carbon dioxide + water + energy = glucose + oxygen

Question 12

aerobic ?

anaerobic respiration

Answer 12

aerobic = chemical reaction that transfers energy to cells.

anaerobic = transfers energy from glucose to cells.

similarities = both use glucose as the starting molecule , both produce ATP,

Question 13

oxygen debt ?

Answer 13

because anaerobic respiration cause the lactic acid to build up and causes an oxygen debt

Question 14

what changes take place during exercise ? how do they help the body cope with an increased energy demand ?

Answer 14

bring more oxygen into the body and remove the carbon dioxide produced. the heart rate increases, to supply the muscles with extra oxygen