Please help with this question:

Meife used the same seed throughout the experiment. Give 2 reasons how using the same seed helps to make experiment a fair test

Sctc:

I thought it was bateria too! Haiz....

I think it should be bacteria....
In the graph of option 4, the amount of bacteria increased after G, so if it incresed the plants would die, and in the graph for option 1, the amount of nutrients increased after G (Not straight after, but a few distance after G) So if the question states that plants living deep in river after point G died, the nutrients have to be decreasing, if it is increasing, thag mesns that the plants living after point G did not all die. But im not sure...
Sorry my english is bad

kgaihc:

NerdyMath:

[quote=\"Popick\"]What's the ans for qn 15 the qn on the effects of fertilisers at point g

4. Nutrients.

Why Nutrients? How does nutrients make the plants die?[/quote]The nutrients did not make the plants die. The plants died only because there was lack of nutrients.
If you were to read the question properly, it says: After some time, plants living deep in the river AFTER point G dies. So the plants at G did not die, after point G, there was less nutrients for the plants.

Sctc:

curiousage:

How about the question about the soaked seeds? Why aren't it filled up in the \"container\"?

I said so there is sapce for the seed to germinate :lightrod:

To prevent overcrowding and competition for air, water and warmth.

NerdyMath:

NotMyRealName:

For part A of the germinating seed question [booklet b]

I wrote:
Putting many seeds together causes overcrowding and competiton for air and warmth, so the seeds cannot grow healthily.
Is it correct?

I wrote the same as you.

It reduces competition for water, oxygen, space and warmth.

It prevents overcrowding too

Please help with this question:

Science PSLE 2015 Booklet B, question 32c
Question is: Suggest a control set up to sjow that the rise in temperature was caused by the germinating seeds.

DarkVoice:

Hi, I have a question to ask:

______________________________________________________________________

In which of the habitats would centipedes, ants and earthworms, most likely be found?

(1) Habitat with moderate temperature, little water and very little light most of the time
(2) Habitat with low temperature most of the time, a lot of water and light that is present in small amounts during the summer months
(3) Habitat with higher temperature in the day than at night, a lot of water and has more light on the surface than below the surface
(4) Habitat with very high temperature in the day and very low at night, very little water and abundant sunlight in the day
______________________________________________________________________

I chose (2), but given answer is (1). Why?

The habitat of the centipedes, ants and earthworms are most likely found in (1), because the centipedes, ants and earthworms prefer to stay in dark areas with little water.