B11

Question 1

Hormone

2-3Marks

Answer 1

Glands which secrete chemicals(1)
Directly into bloodstream(1)
Carried to a target organ producing an effect(1)

slower but acts for longer than the nervous system

Question 2

Hormones released by pituitary gland

MASTER GLAND

Answer 2

Anti diuretic hormone(ADH):(kidney)
•Controls water levels in the blood

Thyroid-stimulating hormone:(Thyroid)
•Thyroid gland secretes thyroxine which controls metabolic rate

LH:(ovaries)
•stimulates egg release and progesterone production

FSH:(ovaries)
•causes egg to mature and produce oestrogen

Prolactin:(breasts) produces milk

Question 3

Negative Feedback:Blood Glucose concentration control

6 Marks

Answer 3

1) Person eats
2) Increases glucose levels
3) Pancreas releases insulin
4) Removed from blood and into cells
5) stores in liver and muscles where glucose is converted into glycogen
6) when glucose levels too low
7) glucagon converts it back to glucose
8) enters directly back into the bloodstream

Question 4

Type 1 Diabetes

Answer 4

• Pancreas fails to produce enough insulin
• leads to uncontrolled HIGH blood-glucose levels

Treated with— insulin injections

Question 5

Type 2 Diabetes

Answer 5

• body cells no longer respond to insulin
• risk factor= obesity

Treated— controlled carbohydrate diet
Exercise

Question 6

Remember:

Answer 6

HIGH = not enough insulin

LOW = not enough glucagon

Possible topics: respiration,the blood,negative feedback,hormones

Question 7

LIGHT-PHOTOTROPISM

Lovable Puns

Answer 7

Auxin—TIP of the shoot

Auxin—moves to shaded side

Auxin—cell elongation

USES:
Weed killers
Rooting Powders
Promoting growth in tissue culture

Question 8

GRAVITY- GEOTROPISM/GRAVITROPISM

Groovy Geezers

Answer 8

Auxin—TIP of the ROOT

Auxin—moves to root facing forwards gravity(on Earth thats down)

Auxin—stops cell elongation so roots grow down

Question 9

Gibberellins:

Answer 9

Ends seed dormancy

Promote Flowering

Increase fruit size(plant growth)

Question 10

Ethene:

Answer 10

Controls cell division
Ripening of fruits

Helps flowers open
Dropping of leaves

Used in storage and transport

Question 11

Menstrual Cycle

Answer 11

FED FSH is produced
MONKEYS Matures eggs
OPEN Oestrogen secreted
THEIR Thickens and grows uterus lining
LUNGS LH lvls rise so egg is released
PROUDLY Progesterone secreted
IN SPITE OF Inhibits production of FSH and LH
PANDAS CRYING progesterone levels crash as egg
not fertilised so uterus sheds.

Question 12

Controlling fertility:

Answer 12

Barrier= condoms and diaphragm

Contraceptive pill= oestrogen inhibits FSH

Spermicide= kills sperm

Abstinence

Sterilisation/Vasectomy= permanent surgery

Implant= slow release progesterone

Question 13

Describe IVF

4 marks

Answer 13

• giving mother FSH and LH to mature some eggs
• Egg and Sperm collected in laboratory and fertilised
• Embryo formed
• when tiny balls of cell, embryo inserted into mothers womb for further development