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Biology Assignment 6, Assignments of Biology

Biology

Assignment on immunity and drugs

Typology: Assignments

2025/2026

Uploaded on 06/18/2026

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lynn-mthombeni 🇿🇦

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IGCSE BIOLOGY
1
ASSIGNMENT 06: IMMUNITY, COORDINATION AND DRUGS
Please read this before you start!
- Candidates will answer on the question paper.
- This assignment should be done under test conditions.
- Answer all questions.
- The use of an electronic calculator is expected, where appropriate.
- You are reminded of the need for clear presentation in your answers.
- The number of marks is given in brackets [ ] at the end of each question or part
question.
- At the end of this assignment, there is a feedback section. Please feel free to make
suggestions about the course or bring any issues to my attention.
- After completion of the assignment, please scan the relevant pages and save them as
a single pdf file.
- Submit this pdf document on your dashboard.
Layout of the assignment
For multiple choice questions (Section A):
- Write in soft pencil.
- Do not use staples, paper clips, glue or correction fluid.
- Answer all questions. For each question there are four possible answers: A, B, C and
D.
- Choose the one you consider correct and record your choice in soft pencil on the
Answer Page.
- Read the instructions on the Answer Page very carefully.
- Each correct answer will score one mark. A mark will not be deducted for a wrong
answer.
- Any rough working should be done in this booklet.
For short answers and practical questions (Section B and C):
- Write in black ink.
The total marks for this assignment is 58.
Recommended time: 1 hour 10 minutes
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Download Biology Assignment 6 and more Assignments Biology in PDF only on Docsity!

ASSIGNMENT 06: IMMUNITY, COORDINATION AND DRUGS

Please read this before you start!

  • Candidates will answer on the question paper.
  • This assignment should be done under test conditions.
  • Answer all questions.
  • The use of an electronic calculator is expected, where appropriate.
  • You are reminded of the need for clear presentation in your answers.
  • The number of marks is given in brackets [ ] at the end of each question or part question.
  • At the end of this assignment, there is a feedback section. Please feel free to make suggestions about the course or bring any issues to my attention.
  • After completion of the assignment, please scan the relevant pages and save them as a single pdf file.
  • Submit this pdf document on your dashboard.

Layout of the assignment

For multiple choice questions (Section A):

  • Write in soft pencil.
  • Do not use staples, paper clips, glue or correction fluid.
  • Answer all questions. For each question there are four possible answers: A , B , C and D.
  • Choose the one you consider correct and record your choice in soft pencil on the Answer Page.
  • Read the instructions on the Answer Page very carefully.
  • Each correct answer will score one mark. A mark will not be deducted for a wrong answer.
  • Any rough working should be done in this booklet. For short answers and practical questions (Section B and C):
  • Write in black ink.

The total marks for this assignment is 58.

Recommended time: 1 hour 10 minutes

  • You may use an HB pencil for any diagrams or graphs.
  • Do not use red ink, staples, paper clips, highlighters, glue or correction fluid.
  • Answer all questions.
  • You may lose marks if you do not show your working or if you do not use appropriate units. Please complete the section below before you start: Name and surname: __________________________________ Date:______________________ Declaration: I completed this assignment under test conditions : Without any resources such as textbooks, notes or online resources. Sign: ______________________________________ Be sure to scan this together with your assignment for marking. If this declaration is not submitted, assignments will not be marked.
  1. Which statement about microorganisms is correct? A Bacteria are killed by hydrochloric acid in the duodenum. B Bacteria can become resistant to antibiotics. C Bacterial infection and viruses are treated with antibiotics. D Bacteria are eukaryotes.
  2. Penicillin is an antibiotic that kills bacteria by preventing them from forming cell walls. Why does penicillin not affect viruses? A Viruses become resistant to penicillin. B Viruses do not contain cytoplasm. C Viruses do not have cell walls. D Viruses reproduce very rapidly.
  3. The steps to produce a reflex action where the hand is withdrawn from a hot object are shown. 1. Nerve impulses pass from the sensory neurone to the relay neurone 2. Nerve impulses pass from motor neurone to the effector 3. Nerve impulses pass from the receptor to the neurone What is the correct sequence of steps? A 1 → 2 → 3 B 2 → 1 → 3 C 3 → 1 → 2 D 3 → 2 → 1
  4. What is the function of the cornea? A Carries impulses to the brain B Contains light-sensitive receptors C (^) Controls how much light enters the eye D Refracts light
  1. The fovea of the eye has three kinds of cones absorbing light of different colours. Which row is correct? type of cone stimulated red sensitive blue sensitive green sensitive colour seen A no yes yes red B yes no yes blue C yes yes no green D yes yes yes white
  2. Which responses occur in the iris of the eye when a person walks from a dimly lit area to a brightly lit area? circular muscle radial muscle A contract contract B contract relax C relax contract D relax relax
  3. What is not an effect of the hormone adrenaline? A decreased production of sweat B dilated pupils C increased blood glucose D increased pulse rate 10.A person eats a large bowl of rice. What happens to the amounts of insulin, glucagon and glycogen in their body? insulin glucagon glycogen A decreases decreases increases B decreases increases decreases C increases decreases increases D increases increases decreases

Section A – Multiple Choice Answer Sheet – [Total: 1 3 marks]

Student name: ____________________________________ Instructions:

  • Use a soft pencil (B or HB).
  • Shade ONE letter only for each question. Example: For question 1, if you think B is the correct answer, complete your answer sheet like this: 1

A B C D E

Make sure you put your answer in line with the correct question number. Rub out any answer you wish to change. 1 A^ B^ C^ D 2 A^ B^ C^ D 3 A^ B^ C^ D 4 A^ B^ C^ D 5 A^ B^ C^ D 6 A^ B^ C^ D 7 A^ B^ C^ D 8 A^ B^ C^ D 9 A^ B^ C^ D 10 A^ B^ C^ D 11 A^ B^ C^ D 12 A^ B^ C^ D 13 A^ B^ C^ D 14 A B C D

Section B – Short Questions – [Total: 29 marks]

Question 1

Plants are sensitive to light. a) Fig. 1.1 shows a sequence of diagrams for two young plant seedlings. The seedlings were first grown in pots with light from all directions and then placed into boxes.

  • Seedling A was placed in a box with light entering from one side only.
  • Seedling B was placed in a box with no light. Complete Fig. 1.1 by drawing seedling A and seedling B , in the boxes , to show the expected direction of their growth after one week. [2]

Question 2

Homeostasis is the maintenance of a constant internal environment. Human skin is involved in the maintenance of a constant internal body temperature. a) Skin is an organ. State why the skin is an organ. ......................................................................................................................................... ......................................................................................................................................... .....................................................................................................................................[1] b) State the name of the organ that coordinates the control of body temperature. .....................................................................................................................................[1] Fig. 2 .1 shows a diagram of a section through human skin. Fig. 2. c) State the names of structures A , B and C in Fig. 2 .1. A ........................................................................................................................................ B ........................................................................................................................................ C ........................................................................................................................................[3]

d) Structure D is a shunt vessel and E is an arteriole. Describe how these blood vessels are involved in maintaining a constant internal body temperature in a cold environment. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ..................................................................................................................................... [3] [Total: 8 ]

Question 3

Pathogens cause disease. Fig. 3 .1 shows some cells that are part of the human immune system. These cells are responding to one type of pathogen. Fig. 3.

In 1946, the government of the country concluded that the vaccine was successful. Discuss the evidence, shown in Fig. 3 .2, for and against this conclusion. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... [4] [Total: 9 ]

Section C – Alternative to practical [Total: 16 marks]

Fig. 1.1 shows an elephant, Loxodonta africana. They have large ears, which help them to control their body temperature. When the elephant is too hot, more blood is pumped into the blood vessels in the elephant’s ears. Increasing blood flow to the surface of the skin helps the elephant to cool down. A student set up a model of what happens in the elephant’s ears, as shown in Fig. 1.2. They placed hot water into two small beakers and stood each one in a larger beaker. One of the small beakers had ‘ears’ and the other did not. The ‘ears’ were represented by two plastic dropping pipettes. The student squeezed and released the pipette ears throughout the experiment so that water continuously moved out of and into the pipettes.

b) The student measured and recorded the temperature of the hot water in both beakers every minute for a total of eight minutes. The student obtained the results shown in Fig. 1.4. Prepare a table to record the observations shown in Fig. 1.4 and the starting temperatures from Fig. 1.3. Complete the table by entering all the results. [4]

c) Suggest one safety precaution that should be taken during this experiment. ............................................................................................................................................................ ............................................................................................................................................................ .................................................................................................................................................... [1] d) (i) A student repeated this experiment and calculated the change in temperature of the water each minute for eight minutes in both small beakers. The change in temperature in the small beaker with pipette ears was 18°C. The change in temperature in the small beaker without pipette ears was 11°C. Explain why it is important to calculate the change in temperature in each beaker. .................................................................................................................................................. .................................................................................................................................................. .................................................................................................................................................. ............................................................................................................................................. [2] (ii) Use the information in part (d)(i) to calculate the rate of temperature change in the small beaker with pipette ears for the student’s experiment. Show your working. Give your answer to two significant figures. rate of temperature change __________________________ °C per min [2]