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GCSEBiology: Combined ScienceOCR GatewayExam Questions3. Organism Level Systems3.3 Maintaining Internal Environments

Maintaining Internal Environments (OCR Gateway GCSE Biology: Combined Science)

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3.3 Maintaining Internal Environments

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3.3 Maintaining Internal Environments

1
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Which of the following statements is not true for homeostasis?

  • Homeostasis is regulated by the cerebrum of the brain.

  • Homeostasis requires input from the endocrine system and the nervous system.

  • Blood glucose levels, body temperature and the menstrual cycle are all regulated through homeostasis.

  • Negative feedback loops are a key mechanism of many homeostatic systems.

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2
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Which row correctly outlines the cause of, and treatment for, Type 1 diabetes?

  Cause Treatment
A Inability of the pancreas to produce insulin Insulin injection
B Inability of the pancreas to produce insulin Controlling diet and regular exercise
C Reduced sensitivity of cells to insulin Controlling diet and regular exercise
D Inability of the liver to produce insulin Insulin injection

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    3
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    The table shows the results of an investigation into osmosis in animal cells.

    Five eggs were deshelled in acid before being placed into five different concentrations of salt solution. The mass of each egg was taken before being placed into the solution and again after 1 hour.

    Concentration of salt solution (mol / dm-3) Mass of egg without shell (g) Mass of egg after 1 hour in solution (g)
    0.0 74.5 79.2
    0.2 73.0 75.8
    0.4 74.2 74.3
    0.6 73.6 72.0
    0.8 75.8 71.5

    Which salt solution was closest to the salt concentration of the egg?

    • 0.0 mol/dm3

    • 0.2 mol/dm3

    • 0.4 mol/dm3

    • 0.6 mol/dm3

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    4
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    The graph shows blood glucose levels after eating a meal.

    q10-paper1h-june2018-ocrgcsebio

    Which point A, B, C or D on the graph would the insulin level in the blood be at its highest level?

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      5
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      Which of these can be used to treat type 2 diabetes but not type 1?

      • Diet and exercise

      • Exercise only

      • Insulin and diet

      • Insulin, diet and exercise

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      6
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      Many human diseases are caused by risk factors.

      Food and drink can be major risk factors.

      Which disease does not have food or drink as a major risk factor?

      • Type 1 diabetes

      • Cirrhosis of the liver

      • Type 2 diabetes

      • Cardiovascular disease

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      7
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      Higher Tier only

      Short-term starvation affects the levels of blood glucose, liver glycogen and the hormones insulin and glucagon.

      Which line on the graph represents the level of glucagon in the blood during short-term starvation?

      q15-paper1h-nov2020-ocrgcsebio

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