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nicnac:

Wood, some float and some sink..

They did not give any conditions. If they want to test same material will float or sink they will give condition like materials name , material wet or dry before put in water. Volume same or different. If they not give anything they only want to know type of materials either sink or float.

As per my DS understanding, Male part and female part of flower bloomed at same time and live for 7 days after that either one fall off first, after 2 days next one fall. There is high chance to pollinate by insect with same flower.[/quote]

As per my DS also insect one flower( with same flower). Don’t know which one is correct?[/quote]
If they give conditions like male and female parts matured at different timings, insect with two flower pollination will be correct.
But conditions said male and female part bloomed same time and stay live 7 days. But one part die 2 days earlier than other. So We no need to think about later part. It means 7 days Anther and stigma stay live for pollination. One (same)flower insect pollination will be correct answer.

From Primary 3 material topics students learned only ability to float or sink. They give some examples for floating materials and some examples for sinking materials. Basic science teach only some type of materials float on water and some other types sink on water. Two solids sink one float means they want to know one type material like steel ball will sink and other type material like styrofoam ball will float. Not necessary to think density, surface tension. These are out of topics. Question will be within in the syllabus. I studied many primary science books before I teach my child, all books covered only material either float or sink. If we study general science topics we can consider other factors. Thanks.

Sctc:

I think the question did mention something like the pistil will fall off first followed by the stamen, meaning that they mature at different timing, that will prevent self pollination. I may be wrong.

As per my DS understanding, Male part and female part of flower bloomed at same time and live for 7 days after that either one fall off first, after 2 days next one fall. There is high chance to pollinate by insect with same flower.