{"id":240581,"date":"2022-06-15T16:49:21","date_gmt":"2022-06-15T08:49:21","guid":{"rendered":"https:\/\/thepiquelab.com\/blog\/?p=240581"},"modified":"2022-11-06T23:10:12","modified_gmt":"2022-11-06T15:10:12","slug":"2018-henry-park-primary-school-hpps-p6-prelim-examination-paper-analysis","status":"publish","type":"post","link":"https:\/\/thepiquelab.com\/blog\/2018-henry-park-primary-school-hpps-p6-prelim-examination-paper-analysis\/","title":{"rendered":"2018 Henry Park Primary School (HPPS) P6 Prelim Science Examination Paper Analysis"},"content":{"rendered":"

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Welcome back to our\u00a0Examination Paper Analysis<\/strong>\u00a0series!<\/p>\n

In this article, we will be reviewing the 2018 Henry Park Primary School (HPPS) P6 Prelim Science Examination Paper<\/strong>.<\/p>\n\n

What Topics Are Covered In This Paper?<\/h2>\n

As this is a preliminary paper to prepare students for the PSLE, there is a good mixture of topics tested from both the lower and upper blocks.<\/p>\n

The two topics with the highest weightage are Heat Energy<\/strong><\/a> <\/span>(6 questions – 4 MCQs & 2 OEQs) and\u00a0Plants<\/strong><\/span><\/a> (4 questions – 2 MCQs & 2 OEQs). I have also compiled the topics tested in the table below:<\/p>\n

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Today, I have selected 2 questions from this paper to discuss in this article. Firstly, we are going to take a look at a question on the topic of Plants<\/strong><\/span><\/a>\u00a0about how to use a potometer to measure the rate of transpiration. In the next question, we will be discussing a question from the topic of Web of Life<\/strong><\/span><\/a> and I will be introducing the concept of a “triangle relationship” to you.<\/p>\n

Here’s what we will be learning today:<\/h3>\n
    \n
  1. How you can observe the movement of water?<\/li>\n
  2. How does placing the plant under different conditions cause the plant to absorb different amounts of water?<\/li>\n
  3. How do we determine the change in an organism\u2019s population by looking at the most immediate impact on the food web?<\/li>\n<\/ol>\n
    \n

    Read Also:<\/h3>\n
      \n
    1. Plant Cycle: The Dilemma of the Stomata<\/a><\/strong><\/li>\n
    2. How To Classify Organisms in a Food Web<\/a><\/strong><\/li>\n<\/ol>\n<\/div>\n

      Let’s Take A Look At Q31b<\/h2>\n

      \"\"<\/p>\n

      Source: Henry Park Primary School \u2013 2018 P6 Prelim Examination Paper [Q31b]<\/em><\/p>\n

      Thought Process<\/h2>\n

      This set-up is a potometer. Although you are not required to memorise the name of this set-up, you will need to understand how it works. When plants absorb water through the roots, a “suction” of water is created in the set-up. This is similar to when we use a straw to drink – our mouth is sucking in liquid from one end of the straw much like how the roots of the plants are sucking in water.<\/p>\n

      \"\"<\/p>\n

      How do we observe the movement of water in the potometer if the water looks the same at different positions in the tube? In order to do so, scientists have included an air bubble in this set-up – by observing the movement of the air bubble as water is being absorbed by the roots, we can observe and record the rate at which water is being absorbed.<\/p>\n

      As I’ve mentioned earlier, the potometer measures the rate of transpiration, which is the rate at which water is lost through the stomata of the leaves as water vapour. If you are wondering how does the amount of water vapour lost relate to the amount of water being absorbed, the concept behind this is that the greater the amount of water lost by the plant, the greater the amount of water absorbed by the roots will be to replenish the water loss.<\/p>\n

      Suggested Answer<\/h2>\n

      The air bubble will move to the left. As the leafy plant takes in water through its roots, the water in the set-up will move to the left to occupy the space of the water that was absorbed, causing the air bubble to move to the left together with the water.<\/p>\n

      Bonus Question<\/h2>\n

      \u201cWhy does putting the set up in a warm place with sunlight and moving air cause the time taken for the air bubble to move 50 mm to be the shortest?\u201d<\/em><\/p>\n

      Let’s consider how the conditions stated in the question affect the time taken for the air bubble to move 50 mm.<\/p>\n

      Here’s a summary of the factors affecting the rate of photosynthesis and transpiration to help you out:<\/p>\n

      \"\"<\/p>\n

      Guiding Question 1:<\/strong> What does the presence of light enable the plant to do?<\/p>\n

      The presence of light enables the plant to carry out photosynthesis. In this process, water in the plant is used up.<\/p>\n

      Guiding Question 2:<\/strong> How does the presence of light affect the size of the stomata?<\/p>\n

      As mentioned earlier, the presence of light causes the plant to carry out photosynthesis. Since carbon dioxide is one of the conditions for photosynthesis to take place, the size of the stomata increases to take in more carbon dioxide. However, this process also leads to more water being able to evaporate and escape through the stomata.<\/p>\n

      Guiding Question 3:<\/strong> How does the presence of warm moving air affect the plant?<\/p>\n

      I’d like you to focus your attention on the phrase \u201cwarm moving air\u201d.<\/p>\n