1.
State what is meant by homeostasis. [1]
JD SCIENCE
B3 Organism-level systems
Answer all questions. Show working. Answers are in a separate file on the Worksheets page — do not look at them until you have finished.
2.
State what is meant by a receptor. [1]
3.
State what is meant by a reflex arc. [1]
4.
State what is meant by a synapse. [1]
5.
State what is meant by the eye. [1]
6.
State what is meant by accommodation. [1]
7.
State what is meant by insulin. [1]
8.
State what is meant by glucagon. [1]
9.
State what is meant by Type 2 diabetes. [1]
10.
State what is meant by auxin. [1]
11.
Grace is asked about homeostasis in a OCR Biology paper.
(a) Describe homeostasis. [2]
(b) Explain why homeostasis is important in this topic. [3]
12.
Grace is asked about a receptor in a OCR Biology paper.
(a) Describe a receptor. [2]
(b) Explain why a receptor is important in this topic. [3]
13.
Grace is asked about a reflex arc in a OCR Biology paper.
(a) Describe a reflex arc. [2]
(b) Explain why a reflex arc is important in this topic. [3]
14.
Grace is asked about a synapse in a OCR Biology paper.
(a) Describe a synapse. [2]
(b) Explain why a synapse is important in this topic. [3]
15.
Grace is asked about the eye in a OCR Biology paper.
(a) Describe the eye. [2]
(b) Explain why the eye is important in this topic. [3]
16.
Grace is asked about accommodation in a OCR Biology paper.
(a) Describe accommodation. [2]
(b) Explain why accommodation is important in this topic. [3]
17.
A reflex takes 0.018 s to travel 1.8 m. Calculate the speed of the impulse. [3]
18.
Blood glucose rises from 4.0 to 6.6000000000000005 mmol/dm³. Calculate the percentage increase. [3]
19.
A person produces 1.5 dm³ of urine a day. How much in a week? [3]
20.
Reaction time is 0.28 s. How far does a car travelling at 15 m/s travel in that time? [3]
21.
A plant shoot bends 12° in 40 minutes. Calculate the mean rate. [3]
22.
Body temperature falls from 37.0°C to 35.5°C. Calculate the drop as a percentage of 37.0°C. [3]
23.
Grace carries out the reaction-time practical (ruler drop). This is a typical OCR required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
24.
Grace carries out investigating phototropism with seedlings. This is a typical OCR required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
25.
Grace carries out testing urine or a model for glucose. This is a typical OCR required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
26.
Grace carries out the human nervous system observation of pupil reflex (light). This is a typical OCR required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
27.
Compare the nervous system with the endocrine system. [4]
28.
Compare Type 1 diabetes with Type 2 diabetes. [4]
29.
Compare rods with cones. [4]
30.
Compare phototropism with gravitropism. [4]
31.
Apply your knowledge of insulin to this situation: the pancreas does not produce enough insulin [3]
32.
Apply your knowledge of glucagon to this situation: they have opposite effects [3]