Download updated 2025 grade 7 end term exam papers in PDF
Integrated Science Theory for 2025 Grade 7 SECTION B (40 marks)
Answer ALL the questions in this section.
31. (a) During a class activity, learners were asked to classify different types of laboratory hazards. (i) Give one example of a material that is classified as flammable. (1 mark)
______________________________________________________________________________________________ (ii) State one first aid measure for a person who has ingested a corrosive substance. (1 mark) ______________________________________________________________________________________________
(b) Explain why it is important to report all laboratory accidents, no matter how minor. (2 marks) ______________________________________________________________________________________________
______________________________________________________________________________________________ 32. The diagram below represents a common laboratory apparatus.
(a) Name the apparatus shown above. (1 mark)
______________________________________________________________________________________________ (b) State two safety precautions to be observed when using this apparatus in the laboratory. (2 marks) ______________________________________________________________________________________________ ______________________________________________________________________________________________
33. Describe how one can separate the following mixtures:
(a) Sand and water. (2 marks)
______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________
(b) Salt and iodine. (2 marks)
______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________
(c) Water from a salt solution. (2 marks)
______________________________________________________________________________________________
34. (a) Learners were provided with red cabbage leaves to prepare a natural acid-base indicator. Describe how the learners could have prepared the indicator. (4 marks)
______________________________________________________________________________________________
(b) Explain why stomach upset is commonly treated with antacids. (2 marks)
______________________________________________________________________________________________
35. The flow chart below shows parts of the human urinary system.
(a) Name the parts labelled P, Q, and R in the flow chart.
P: _______________________________________________________
Q: _______________________________________________________
R: _______________________________________________________ (3 marks)
(b) State two functions of the human skin, apart from excretion. (2 marks)
_________________________________________________________________________________________ ________________________________________________________________________________________
(c) Briefly explain one cause of kidney failure. (1 mark)
_________________________________________________________________________________________ _________________________________________________________________________________________
36. (a) During a practical lesson, learners were instructed on the proper use of a Bunsen burner. (i) Describe the procedure for lighting a Bunsen burner safely. (3 marks)
_________________________________________________________________________________________ _________________________________________________________________________________________ _________________________________________________________________________________________
(ii) State one observation skill that is important when observing a chemical reaction in the laboratory. (1 mark) ________________________________________________________________________________________
(b) A learner accidentally splashed a non-corrosive chemical on their skin. Describe the immediate first aid action. (1 mark)
________________________________________________________________________________________ _________________________________________________________________________________________
Grade 7 2025 EndTerm 2 Exam with Marking Scheme
37. (a) Differentiate between homogeneous and heterogeneous mixtures, giving one example for each. (2 marks)
________________________________________________________________________________________ _________________________________________________________________________________________ ________________________________________________________________________________________
(b) A learner needs to accurately measure 25.0 mL of a liquid. Which laboratory instrument would be most suitable for this task? (1 mark)
________________________________________________________________________________________ 38. Explain how each of the following contribute to safety in the laboratory:
(a) Wearing appropriate personal protective equipment like safety goggles. (1 mark)
________________________________________________________________________________________ _________________________________________________________________________________________
(b) Knowing the location of emergency exits and fire extinguishers. (1 mark)
________________________________________________________________________________________
(c) Avoiding eating or drinking in the laboratory. (1 mark)
________________________________________________________________________________________
39. (a) During an activity on electrical energy, learners were asked to identify common electrical appliances in their homes.
(i) Name two common electrical appliances found in a typical Kenyan home. (2 marks) _________________________________________________________________________________________ _________________________________________________________________________________________
(ii) Explain one safety measure that should be observed when using electrical appliances to prevent accidents. (2 marks)
_________________________________________________________________________________________ _________________________________________________________________________________________
(b) Learners drew a simple electric circuit as shown below.
A B
Identify the parts labeled A and B(2 marks)
A: __________________________________________.
B: __________________________________________.
40. (a) A learner is observing a prepared slide of onion cells under a microscope.
(i) State one function of the objective lens of the microscope. (1 mark)
__________________________________________________________________________________
(ii) Explain why it is important to start with the lowest power objective lens when observing a specimen. (1 mark) ______________________________________________________________________________________________
______________________________________________________________________________________________ (b) If a learner measures the length of a desk as 1.5 meters, what is the SI unit used for this measurement? (1 mark) ___________________________________________________________________________________________ (c) Briefly explain the importance of Integrated Science in addressing environmental challenges. (1 mark)
