P3B Science Test

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Section B (Duration: 1 hour)
Answer the following questions. (30 marks)

1. Study the sets of animals carefully (2m)
a) Set A shows animals that are meat-eaters. They are also called

b) Set B shows animals that eat both and meat. They are also called

2. Fill in the blanks with the words in the box. (2m)

3. Ramesh covered one end of a bar magnet with a thin sheet of cardboard. He then dipped it into a tray of iron fillings and weighed the amount of iron filings that were attracted. He repeated this process using two to five sheets of cardboard each time. He recorded his findings in a table.
(a) What hypothesis do you think Ramesh is trying to test? (1m)

(b) How many grams of iron filings can the magnet attract if Ramesh used 17 layers of cardboard? (1m)

(c) Explain your answer to Part (b). (1m)

4. Study the table below and answer the following questions.
Organ Systems

5. Jennifer sat with her legs crossed and rested a heavy book on her legs. After sitting in this position and reading for one hour, her legs felt numb and she had difficulty in moving them. She got worried and started massaging her legs. After awhile, her legs felt normal and she could move them again.

(a) Why did Jennifer have difficulty moving her legs after one hour? (2m)

(b) What would happen to her leg muscles if Jennifer had sat in this position for two days without moving? Why? (1m)

(c) How did the massage help her legs to get back to normal? (1m)

6. Dawn set up an experiment to demonstrate the way that food is digested. She filled one special rubber bag with 100 g of meat that has been roughly chopped. She filled another similar bag with 100 g of meat that has been finely chopped. She then poured the same of acid and digestive juices into both bags and sealed them up. Following which, she used her hands to squeeze the bags continuously. She checked on the contents of the bag every 15 minutes.
(a) Which organ in the digestive system does the bag represent? (1m)

(b) What bag would have its contents dissolved faster? (1m)

(c) How does this experiment show that importance of teeth in the digestive system? (1m)

7. Meiling ate breakfast at 9 am on each of the 3 days. She drank one cup of milk on Monday, ate one cup of oat porridge on Tuesday, and had one cup of rice on Wednesday. She recorded the times when she felt hungry in the table below:

(a) Which food is the easiest to digest, and which is the hardest to digest? (1m)

(b) Explain your answer to Part (a). (1m)

(c) If Meiling takes her lunch at noon each day, which of the 3 foods should she eat for breakfast? (1m)

The picture above shows a mature balsam plant. Use the picture to match the plant parts to its functions.
(Hint: Some parts may have more than one function) (6m)

(a) Absorb sunlight for the manufacturing of plant sugar during photosynthesis.

(b) Provide support by anchoring the plant and help to take in water and mineral salts.

(c) Contains and protects the seeds which ensure the continuance of the plant species.

(d) Offers support to the leaves, allowing them to reach sunlight. Transports water and mineral salts from the roots to the leaves and food produced in the leaves to other plant parts.

(e) Attracts pollinators to ensure fruit and seeds are produced.

(f) Allows the plants to exchange gases with its surroundings.

9. Study the experiment below.

Jane placed 2 similar plants into 2 separate pots. These are the conditions used in her experiment.

After a few weeks, Jane observed that Plant A was growing. The leaves of Plant B had turned yellow and the plant was drooping.

(a) What is one possible reason to explain Jane’s observation? (1m)

(b) Suggest one way to make Plant A grow more healthily? (1m)

10. Jia Ming puts a balsam plant into a beaker of water in which some red ink has been added.

(a) What will Jia Ming observe about the labelled flower a few hours later? (1m)

(b) Explain your answer for part (a). (1m)

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