Q&A - P3 Science

[ooptimizer]

My answer:

1
2

[acforfamily]

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, just giving my 2 cents worth here.
In answering science questions, we must also go back to the concept. The concept here is the characteristics of living things, one of which is
\"Living things need food, water, air to survive\". For plants, we have to change that to sunlight as they make their own food.
Another characteristic is that they die.

For q1
(a) Place them near the window sill.
This by itself does not tell you whether the plant is real or not. If it has food, water and sunlight, even after a few hours, you won't be able to differentiate.

(b) Count the number of leaves they have.
The real plant and the artificial one can have the same number of leaves. You can only differentiate it if it is left for a few days / weeks when new leaves grow or leaves wilt.

(c) Leave them without watering for a few days.
The real plant will die

(d) Check for wilting or dying leaves and flowers.
Even the real plant may not have dying leaves and flowers if you provide it with air, water, sunlight.

I would be really careful with some of the assessment books' questions ( I presume this is NOT from the school.) I usually cross out those questions which I think is teaching my child the wrong thing! IMHO.

So if forced to answer the question 1, I would choose (b).

[Snow-white]

Hi acforfamily


Thanks for providing the explanation for each answer in question 1. Yes, you are correct. The answer for question 1 is indeed (b)

These two questions came from CA1 and SA1 of two top primary school examination papers.

The answer for question 2 is (a), it is quite confusing as I am not sure if the answer sheet given together with the exam paper is correct or wrong.

[acforfamily]

Snow-white:

2) Vanessa has a pot of sunflower plant and a pot of artificial sunflower (made of plastic).
Which one of the following steps is incorrect to find out whether the plant are living things?

(a) Leave them in the sun for a day.
(b) Count the number of leaves they have after a month.
(c) Leave them without watering for a week.
(d) Check for wilting or dying leaves and flowers after one week.

(a) Leave them in the sun for a day.
This by itself does not tell you whether the plant is real or not. Unless you give it water, the real plant will wilt.

(b) Count the number of leaves they have after a month.
The real plant and the artificial one can be differentiated when new leaves grow or leaves wilt.

(c) Leave them without watering for a week.
The real plant will die

(d) Check for wilting or dying leaves and flowers after one week.
Even the real plant may not have dying leaves and flowers if you provide it with air, water, sunlight.

[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