Q&A - P5 Science

[whywhy]

Thank u, Tianzhu.

[tianzhu]

whywhy:

Thank u, Tianzhu.

Hi

Good Morning.

You're welcome.

Best wishes

[tianzhu]

SAHMwith2boys:

http://i48.tinypic.com/2a5emwj.jpg\">


Another qn looking for help. Ans given was (2) Water Lily. DS and me have totally no idea why.... :?:

Hi

I am more inclined to go for (3).

A sudden increase in the population of water hyacinth blocks sunlight and prevent the hydrilla from carrying out photosynthesis to survive.

Best wishes

[SAHMwith2boys]

tianzhu:

SAHMwith2boys:

http://i48.tinypic.com/2a5emwj.jpg\">


Another qn looking for help. Ans given was (2) Water Lily. DS and me have totally no idea why.... :?:

Hi

I am more inclined to go for (3).

A sudden increase in the population of water hyacinth blocks sunlight and prevent the hydrilla from carrying out photosynthesis to survive.

Best wishes

DS would be really glad to see ur reply, he had the same theory as urs.... ...really wonders how r we gg to survive for P6 science...

[Michaelia0816]

SAHMwith2boys:

tianzhu:

[quote=\"SAHMwith2boys\"]http://i48.tinypic.com/2a5emwj.jpg\">


Another qn looking for help. Ans given was (2) Water Lily. DS and me have totally no idea why.... :?:

Hi

I am more inclined to go for (3).

A sudden increase in the population of water hyacinth blocks sunlight and prevent the hydrilla from carrying out photosynthesis to survive.

Best wishes

DS would be really glad to see ur reply, he had the same theory as urs.... ...really wonders how r we gg to survive for P6 science...[/quote]Hey! This is in my textbk, and in my textbk got the similar question but My answer is also similar to Tianzhu but more clearer and specific, you may consider looking in Psle Revision Guide!

[SAHMwith2boys]

Thanks TianZhu for your reply and Michaelia0816 for recommendation. I will go and look for the book.

[zckenny]

In a single flower, anther and stigmas usually mature at different times. Why is this so?

[atutor2001]

zckenny:

In a single flower, anther and stigmas usually mature at different times. Why is this so?

Is this a primary school question? If it is then the science questions are becoming really scary.

Anyway this is a very interesting phenomenon that I have observed when I was pollinating my plants. I noticed that for those with male and female flower on the same plant, the male flowers will bloom first. For example, the first batch of flowers of a new adult cucumber plant are all male. As for plants with bisexual flowers i.e. with both male and female reproductive parts, the stigma will usually mature first.

I guess it is to discourage self-pollination. Probably self-pollination is like \"in-breeding\" and will produce weaker offspring.

[zeemimi]

I’m not sure if this has been asked before but hope someone can clarify.


Is steam gas or liquid?

[atutor2001]

zeemimi:

I'm not sure if this has been asked before but hope someone can clarify.


Is steam gas or liquid?

Steam is gaseous state.

A common problem is to mistaken the \"white cloud\" escaping from the spout of a kettle of boiling water to be steam. The \"white cloud\" is not steam. It is tiny water droplets (in liquid state). The steam upon coming into contact with the colder air immediately condenses into tiny water droplets, appearing as \"white cloud.\"

Steam is colourless and is invisible.