Blog

  SECTION A TOTAL [50]

1.4 The blue button below is linked to a dichotomous key.  Click on the button and use the diagram to answer the following questions. TO VIEW THE DIAGRAM, RIGHT CLICK ON THE BUTTON BELOW AND OPEN IT IN A NEW TAB.    

4. Read the case study below and answer the questions that follow:       We all get tired sometimes, especially if we have been doing a lot of physical activity. But for Jasmin, a 34-year-old former high school track star who is now a recreational runner, her tiredness was going far beyond what she thought should be normal for someone in generally good physical shape. She was experiencing extreme fatigue after her runs, as well as muscle cramping, spasms, and an unusual sense of heaviness in her legs. At first, she just chalked it up to getting older, but her exhaustion and pain worsened to the point where the former athlete could no longer run for more than a few minutes at a time. She began to experience other unusual symptoms, such as blurry vision and vomiting for no apparent reason. Concerned, Jasmin went to her doctor, who ran many tests and consulted with several specialists. After several months, she was finally diagnosed with a mitochondrial disease.  Her doctor explained that this is a disorder that occurs when the structures that produce energy for a cell malfunction. A common factor among mitochondrial diseases is that the mitochondria are unable to completely burn food and oxygen to generate energy, which is essential for normal cell function. Symptoms might include poor growth, developmental delays, and muscle weakness. There’s no cure, but physiotherapy and medication can manage symptoms.   https://flexbooks.ck12.org/cbook/ck-12-college-human-biology-flexbook-2.0/section/4.1/primary/lesson/case-study%253a-the-importance-of-cells    

3.2.1 According to this label:   a) how many Smarties equal one serving? (1)         b) how much saturated fat would you be taking in if you had three servings of Smarties?  (Show your calculations) (3)         c)  Explain the link between saturated fat, cholesterol and atherosclerosis. (3)         d)  According to this label, how many grams of fibre are found in 100g smarties? (1)         e) According to this label, what percentage of the carbohydrates in Smarties, is made up of sugar? (2)      

2.1 The blue button below is linked to a diagram showing a geological timescale.  Study it carefully  and then answer the questions that follow. TO VIEW THE DIAGRAM, RIGHT CLICK ON THE BUTTON BELOW AND OPEN IT IN A NEW TAB.    

1.2.2 Name ONE important structure found in parts 1,2 and 3 respectively. (3)

1.5.6 Is skull E showing a chimpanzee skull or a human skull? Describe THREE features visible on the skull, you used to identify the skull. (4)  

4.2 You work for a Health magazine that targets teenagers, and your job is to answer questions from the readers.  One of your readers wrote in to describe a new diet that he is following in order to lose weight.  The diet states that ALL lipids must be removed from the diet. Formulate your response that will be published in the next edition of the magazine.  Describe the variety of roles that fats play in the body and offer two suggestions on a healthier way to lose weight. (10)

2.2.1 Verduidelik waarom daar soms na ‘n selakant verwys word as ‘n ‘lewende fossiel’. (2)       2.2.2 Hoe oud word daar gedink is die selakantsoort? (1)       2.2.3 In watter jaar is die eerste selakant ‘herontdek’? (1)       2.2.4 Waarom is mariene bioloë so bekommerd dat die nuwe olieboorplatvorms die selakante sal laat uitsterf? Verskaf drie oorspronklike goed deurdagte redes. (3)       2.2.5 Verskaf drie oorspronklike goed deurdagte redes waarom die olieboorwerk moet voortgaan. (3)      

1.2.3 The blue button below is linked to a micrograph of a cell.  Study it carefully and then answer the question that follows: TO VIEW THE DIAGRAM, RIGHT CLICK ON THE BUTTON BELOW AND OPEN IT IN A NEW TAB.