Q&A - P3 Science

[Muffins]

Snow-white:

Hi


Can anyone help me with the following two questions? Would appreciate if you could provide an explanation for each given answer. Thanks!

1) Lydia has a pot of orchid plant and a pot of articifial orchid plant. Which one of the following is the incorrect method to find out which is the real plant?

(a) Place them near the window sill.
(b) Count the number of leaves they have.
(c) Leave them without watering for a few days.
(d) Check for wilting or dying leaves and flowers.

Hi Snow-White, I would choose (b) as the incorrect method. For (a), if you put them near a window-sill, the real plant might photosynthesise, while the artificial plant will not, and, after a few days, more leaves might grow on the real plant, or it might grow bigger, while the artificial plant will stay the same. For (c), if you leave them without watering for a few days, the real plant will wilt whereas the artificial plant will stay the same, so this is also an accurate method. For (d), if you check for wilting and drying flowers, the real plants might have dried leaves and wilted flowers, whereas the artificial plant will never have them. That is why that is also an accurate method for solving the problem. The only inaccurate one is (b), as you can count the number of leaves they have, and if both have the same number, then how will you know which one is the real one and which one is the artificial one?

Hope I helped!

[Snow-white]

Dear acforfamily and Muffins


Thank you so much for helping and sharing! I appreciate your valuable inputs to the questions.

[kitty2]

Please help with the below questions,got them from top school papers.I’m afraid some of the anwers are wrong.Thanks for your help


1)Animal A Shark
Whale
Dolphine

Animal B Ostrich
Penguin
Sparrow

Which animal is classified wrongly?


2)

Which of the following does not show that plants can move by themselves?

1)Leaves sway in the breeze
2)The sunflower turns to face the sun
3)Leaves of the rain tree fold up at night
4)A mimosa plant closes its leaves when touched

3)

The pull of a magnet is not likely to pass through a

1)plastic wrapper
2)piece of steel plate
3)thick piece of wood
4)piece of tracing paper

4)Plants take in__________and give out_______all the time
Plants take in __________and give out_______in the presence of light

[P5G]

kitty2:

Please help with the below questions,got them from top school papers.I'm afraid some of the anwers are wrong.Thanks for your help


1)Animal A Shark
Whale
Dolphine

Animal B Ostrich
Penguin
Sparrow

Which animal is classified wrongly?

Shark from Animal A.
Reason - Shark is a fish. Whale and Dolphin are mammals.

2)

Which of the following does not show that plants can move by themselves?

1)Leaves sway in the breeze
2)The sunflower turns to face the sun
3)Leaves of the rain tree fold up at night
4)A mimosa plant closes its leaves when touched

Ans: (1)
Reason - The leaves are moved by the breeze.

3)

The pull of a magnet is not likely to pass through a

1)plastic wrapper
2)piece of steel plate
3)thick piece of wood
4)piece of tracing paper

Ans: (2)
Magnetism cannot pass through steel which is a magnetic material.

4)Plants take in__________and give out_______all the time
Plants take in __________and give out_______in the presence of light

oxygen , carbon dioxide
carbon dioxide , oxygen
Reason: Respiration and Photosynthesis
Do you study this in P4 Science? I am just learning this in P5 - System in Living Things - Air, breathing and respiratory system

Could someone help me with the Science questions I posted at PSLE Science? TIA.

[usaik]

Hi I need help on the following P3 top school exam paper question : -


The table below show 2 groups of flowers

Group A
Angsana
Ixora
Frangipani

Group B
Water Lily
Hibiscus
Morning Glory

The flowers are classified according to ___________________ .
(1) The colours of their petals
(2) The number of petals in each flower
(3) whether they grow singly or in bunches
(4) Whether they have big petals or small petals.

The answer provided is 3. But I thot Ixora grows in cluster whereas Frangipani and Angsana grows singly so how can they be classified into the same group? Can someone help me here?

[tianzhu]

Hi


If I am not wrong, this question is Q7 from this paper.
http://www.orlesson.org/orp/09Sc/P3-09-Sc-CA1-MahaBodhi.pdf

The WS’s answer is correct.
The flowers in Group A grow in clusters.

http://infopedia.nl.sg/articles/SIP_405_2005-01-28.html
http://www.articlesbase.com/gardening-articles/know-about-frangipanis-1390159.html
http://www.wisegeek.com/what-is-an-ixora.htm

Best wishes

[kitty2]

:thankyou: P5G

[kyp71]

Hi anyone can recommend any good science tutors or small group tuition for my P4. Prefer around clementi / west coast area/jurong or Bukit Timah. I would prefer one who has many years of experience in science teaching. Thks so much. My contact is 98440902 or email [email protected]. Mrs Wong

[Rosmary]

Appreciate if anyone can advise on the following question :


GROUP A : CAT, WHALE, MONKEY
GROUP B : GOOSE , PENGUIN , OWL

The animals are grouped according to

1- what they eat
2- where they live
3 - how they move
4- their body covering

Anyone can explain why is 4 is the answer

[rocklee]

Let me try this.


Animals in group A belong to the group of Mammals. Mammals are generally covered with fur.

Aminals in group B belong to the group of Birds. Birds are generally covered with feathers.

Make sense?