Tutor Niedino: Pri Science Questions and Concepts

[starlight1968sg]

Insecticides are sprayed onto the plant. They entered the soil and get absorbed by the plant. The insecticides are found in the xylem-water carrying tubes.


Insects eat the sugar (food) made by the leaves of the plant. This sugar is found in the phloem.

How do the insecticides kill the insects?

Thanks.

[atutor2001]

Vanilla Cake:

Hi Niedino,

Please assist to solve the following P6 Science questions:
.....

Hi Vanilla Cake

Sorry I could not resist giving my opinion for some of your questions because they are very interesting. My views are :

1. The predators died of because of old age (natural cause as they are too old) :oops:

2. The water is very cold causing the air in the leaf to contract.
Kelly has plucked the leaf from a cactus :lol:
The leaf is covered with oil.

Don't take my answers too seriously please.

[Vanilla Cake]

atutor2001:

Vanilla Cake:

Hi Niedino,

Please assist to solve the following P6 Science questions:
.....

Hi Vanilla Cake

Sorry I could not resist giving my opinion for some of your questions because they are very interesting. My views are :

1. The predators died of because of old age (natural cause as they are too old) :oops:

2. The water is very cold causing the air in the leaf to contract.
Kelly has plucked the leaf from a cactus :lol:
The leaf is covered with oil.

Don't take my answers too seriously please.

Hi atutor2001,
Thks for your helpful replies. This year's PSLE 2010 Science will be an interesting one to watch:

(1) 20% contention reduction.
(2) OE questions reduced from 16 to 14.
(3) Process skills are made explicit:
(a) Inferring (Generating - draw inferences)
(b) Predicting (Generating - making predictions)
(c) Generating possibilities (Generating - suggest ideas)
(d) Formualting hypothesis (Generating - construct a hypothesis)

and my younger sister will be the 2nd batch of PSLE students to take this revised PSLE Science in 2011.

[atutor2001]

Hi Vanilla cake


I love pri science because sometimes the answers can be so silly. I remembered encountering a question asking "why Mary kept a pregnant female guppy for some times but it did not lay eggs". My kid thought the eggs were not fertilised but was wrong. The correct answer was that the time was not long enough and the eggs were not developed yet. We had a good laugh when she came back with the answer.

By the way, with the reduction in the number of open end questions, will it still remain as 40 marks or less. If it is less, then it will be good for most students because they are usually better with the MCQ.

[starlight1968sg]

Vanilla Cake:

Hi atutor2001,
Thks for your helpful replies. This year's PSLE 2010 Science will be an interesting one to watch:

(1) 20% contention reduction.
(2) OE questions reduced from 16 to 14.
(3) Process skills are made explicit:
(a) Inferring (Generating - draw inferences)
(b) Predicting (Generating - making predictions)
(c) Generating possibilities (Generating - suggest ideas)
(d) Formualting hypothesis (Generating - construct a hypothesis)

and my younger sister will be the 2nd batch of PSLE students to take this revised PSLE Science in 2011.

I am confused; isn't 40% for sect b in PSLE Science 2011?
Thanks.

[Vanilla Cake]

atutor2001:

By the way, with the reduction in the number of open end questions, will it still remain as 40 marks or less. If it is less, then it will be good for most students because they are usually better with the MCQ.

Hi atutor2001,
From the talk by my younger sister's Primary school last year if my mum remembered correctly,

In 2010, PSLE Science will have 30 MCQ questions (unchanged) and 14 open-ended questions (changed from 16).
The question type and skills tested remain the same, though there is some content reduction.The figure - about 20% content reduction was mentioned.

You are absolutely right, take the case of my younger sister's recent P5 SA1 Science exam. She scored perfect marks for MCQ but lost 9 marks in the OE section. Two OE questions were awarded zero marks and her teacher was kind enough to mark zero mark instead of a big cross.

I think it's close to impossible to score perfect marks for PSLE Science.So, I am surprised that http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=10918&postdays=0&postorder=asc&start=30 mentioned that he had scored 100/100 for his P6 2010 SA1 Science.Hope that he can share with us his skill or art in achieving this remarkable feat.

starlight1968sg:

I am confused; isn't 40% for sect b in PSLE Science 2011?
Thanks.

Hi starlight1968sg,
Sorry for the confusion. Pls refer to my reply to atutor2001,

30 MCQ questions (unchanged) - 60%
14 open-ended questions (changed from 16). - 40% (Note sure how the 40% is distributed among the 14 OE questions)

Content reduction refer to the Science topics examined.I think these topics are omitted:
(1) Day & Night Cycles inclusive of solar system
(2) Simple machines
(3) Skeletal/Muscular systems
(4) Environmental Impact (Biotechnology)
and a couple more topics.(If you know them, pls add to the list)

Thanks.

[starlight1968sg]

Thanks Vanila cake for sharing.

Yes, sect b is the killer for Science.

[caroline3sg]

My ans to Vanila Cake’s Q3.


a) The aim of the experiment is to find out which of the 4 types of food is the mealworm’s favourite food.
b) It is to ensure a fair test as distance from the centre to the 4 corners is the same.

[caroline3sg]

My ans to Vanila Cake's Q6


1) Sun is our primary source of light. Plants give out oxygen and take in carbon dioxide during photosynthesis (in the presence of sunlight). This exchange of gases ensures sufficient oxygen for all living things.

2) Earth is the only planet that has the correct amount of air, sunlight, water to sustain life.

3) God created the Earth as such :love:

[Tang]

atutor2001:

Hi Vanilla cake


I love pri science because sometimes the answers can be so silly. I remembered encountering a question asking \"why Mary kept a pregnant female guppy for some times but it did not lay eggs\". My kid thought the eggs were not fertilised but was wrong. The correct answer was that the time was not long enough and the eggs were not developed yet. We had a good laugh when she came back with the answer.

By the way, with the reduction in the number of open end questions, will it still remain as 40 marks or less. If it is less, then it will be good for most students because they are usually better with the MCQ.

Given sufficient time, the female guggy will give birth to live young and not lay egg.