PSLE 2009 - Science
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kohjl:
I think catepillars eat leaves and not fruits. Worms eat fruits.justsay:
As you have mentioned it killed most of the caterpillars but not all. The remaining caterpillars will then multiply and feed of the fruits. So shouldnt it be crop increased and fruit decreased ?
From: kohjl Jr
Q: What do caterpillars eat?
A: Almost all caterpillars eat plant materials. Most eat leaves, but some eat seeds, stems, roots, fruits, seed pods or flowers. The caterpillar of the Harvester butterfly eats aphids. Some lycaenid caterpillars eat ant larvae.
(http://www.flmnh.ufl.edu/butterflies/qanda.htm) -
the questions asked do not look like straight forward ones… i don’ t even dare to ask my girl for her answers, least in case she wrote different from everyone here and i cannot sleep after that…
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lovingmum:
the questions asked do not look like straight forward ones... i don' t even dare to ask my girl for her answers, least in case she wrote different from everyone here and i cannot sleep after that...
some of the q. in the paper are quite straightfoward though
rest assure that your daughter would do well!
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acelancer:
I put that too! :celebrate:
yup! i put tht too! at first i was stump by it.....Vaizard:
Hello, I am a candidate taking the PSLE.
What is the answer for the question about the flower wrapped with plastic bag? Is the answer B and anther? :shock: -
The question about rod X and the magnet. They put a flame over rod x. what do u guys put? i put lose magnetism and the flame kinetic energy thing(sry can’t remember tht clearly)
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kohjl:
my answer was that the plant increased and the fruits decreased.
I think catepillars eat leaves and not fruits. Worms eat fruits.justsay:
As you have mentioned it killed most of the caterpillars but not all. The remaining caterpillars will then multiply and feed of the fruits. So shouldnt it be crop increased and fruit decreased ?
From: kohjl Jr
since the caterpillars feed on the plants, when the caterpillars' population decreases, the population of the plants will increase.
however, with less caterpillars, there will be less butterflies to pollinate the flowers of the fruit trees. wouldn't that result in the number of fruits born by the fruit trees decreasing?
that is my reasoning but i'm not sure though. hope someone can confirm it...
hope i'm right....
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kohjl:
My answer was:
The Question:
The farmer found that alot of caterpillars were eating his crops. The farmer sprayed alot of pesticides onto them. Which of the following is correct?
My answer:
Crops-increased
Fruits-increased
Reason: Even if the pesticides kill some of the plants, pesticides will kill most of the caterpillars. Since there are no more caterpillars feeding on the leaves, the number of crops will increase and therefore, the number of fruits will increase.
From: kohjl Jr
Crops-increased
Fruits-decreased
My reason: The pesticides killed most of the caterpillars. Since there are less caterpillars which feed on the plants, the plants increased. When the caterpillars which were the young of the butterfly decreased, the butterflies will also decrease. The butterflies are needed to help the flowers to pollinate. If there are less butterflies to help the plants pollinate, there will be less fruits as a flower can only become a fruit if it goes through pollination. Therefore, there will be lesser fruits.
:?: Am I correct or wrong? :stupid: -
hot_chocolate:
my answer was that the plant increased and the fruits decreased.
I think catepillars eat leaves and not fruits. Worms eat fruits.kohjl:
[quote=\"justsay\"]
As you have mentioned it killed most of the caterpillars but not all. The remaining caterpillars will then multiply and feed of the fruits. So shouldnt it be crop increased and fruit decreased ?
From: kohjl Jr
since the caterpillars feed on the plants, when the caterpillars' population decreases, the population of the plants will increase.
however, with less caterpillars, there will be less butterflies to pollinate the flowers of the fruit trees. wouldn't that result in the number of fruits born by the fruit trees decreasing?
that is my reasoning but i'm not sure though. hope someone can confirm it... hope i'm right....[/quote]http://pslescience.blogspot.cm has the same ans as u and i think you're right cos' at first i put tht then keng kiang change ans.
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the ME:
hey! you have the same answer as me!
My answer was:kohjl:
The Question:
The farmer found that alot of caterpillars were eating his crops. The farmer sprayed alot of pesticides onto them. Which of the following is correct?
My answer:
Crops-increased
Fruits-increased
Reason: Even if the pesticides kill some of the plants, pesticides will kill most of the caterpillars. Since there are no more caterpillars feeding on the leaves, the number of crops will increase and therefore, the number of fruits will increase.
From: kohjl Jr
Crops-increased
Fruits-decreased
My reason: The pesticides killed most of the caterpillars. Since there are less caterpillars which feed on the plants, the plants increased. When the caterpillars which were the young of the butterfly decreased, the butterflies will also decrease. The butterflies are needed to help the flowers to pollinate. If there are less butterflies to help the plants pollinate, there will be less fruits as a flower can only become a fruit if it goes through pollination. Therefore, there will be lesser fruits.
:?: Am I correct or wrong? :stupid:
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my answer for the lizard and snake question is:
the snake has a larger surface area in contact with the sand than the lizard. thus, there will be more heat transfer to the snake than the lizard.
the lizard moves only on two of its four legs. when it cannot stand the heat on the two legs on which it is traveling, it can always change to the other two legs. however, the snake has only one surface to travel on and cannot change to another surface when it cannot take the heat any longer.
can anyone confirm if my answer is right????
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