Q&A - P3 Science

[Champion]

AgonyMum:

Hi, can someone enlighten me please?

TIA

1.Are clouds water in a liquid state? What are clouds made of actually? (For P3)

2. Can provide more detailed explanation regarding the reproduction of the onion ie bulb? Is ginger in the same group?

3. Does the embryo of the chick feed on egg yolk alone or both yolk and egg white?

4. Does the fruit fly have a 3 or 4-stage life cycle?

1) Clouds are made up of tiny water droplets. Thus, they are in the liquid state. Water droplets are visible but water vapour is not.

2) A bulb is a shortened, compressed, underground stem which is surrounded by fleshy scales (leaves) that envelop a central bud located at the tip of the stem.

When conditions are suitable, a bulb develops into a young plant. When the young plant grows into an adult plant, new bulbs are formed at the base. Here, a new plant would be able to grow again.

Some plants reproduce from plant parts as it is a faster process compared to reproducing from seeds.

eg -- reproduce from underground stem - Ginger, Onion, Potato.


3) The embryo develops into the chick. The egg yolk provides the developing embryo with nutrient.

4) The fruit fly has a stage life cycle -- egg, larva, pupa, and adult.

[AgonyMum]

Hi Champion,

Thanks so much for your reply. :thankyou:

a)The answer sheet states that both egg yolk and egg white provide nutrients for the developing embryo. What is the function of the egg white if it is not food for the embryo? Is it to protect the yolk and embryo?

b)Do underground stems mean bulbs?

Thanks in advance!

[ponyo]

Hi Agony Mum

am surprised these are tested at P3. Remember studying some of these when I was P4/5 decades ago... (how times have changed ).

Just to add on to Champion's reply, both egg white and yolk serve as food for the embryo during incubation. Think it's the albumen in the white that provides nutrients /water to the embryo. However, the white also serve as a protection for the yolk.

Also, regarding the bulb/ginger question, to be more precise a ginger is a rhizome although they (be it bulbs or tubers or rhizomes or stolon/runners) are all broadly categorised as underground stems. But not all underground stems are bulbs. Hope I have not confused you.

btw, just out of curiosity, did you get these questions from assessment books or exam papers?

Cheers
Ponyo

[allcc6]

Pls advise on the following question :


On which part of the body of an insect are the breathing holes found?

(a) Feelers
(b) Head
Abdomen
(d) Thorax

[J and J]

http://i45.tinypic.com/35bftjb.png\">

allcc6:

Pls advise on the following question :


On which part of the body of an insect are the breathing holes found?

(a) Feelers
(b) Head
(c) Abdomen
(d) Thorax

Ans: c

[ponyo]

But there are articles also mentioning that the spiracles are found laterally along the thorax and abodomen...(e.g.)


http://www.cals.ncsu.edu/course/ent425/tutorial/respire.html

so it's rather confusing :nailbite:

[HAPPYH]

Yes, spiracles (breathing holes) are found in the abdomen regions

[jedamum]

alamak. nowadays science test these type of stuff already ah? i thought the purpose of knowing insects in P3 science is to differentiate them from other animals categories and know how to differentiate what is an insect. now still have to know their breathing techniques? :faint:

[auntieM]

jedamum:

alamak. nowadays science test these type of stuff already ah? i thought the purpose of knowing insects in P3 science is to differentiate them from other animals categories and know how to differentiate what is an insect. now still have to know their breathing techniques? :faint:

Yalor... Scary de

[ponyo]

scary indeed...another disaster of teach less learn more? Don't think teacher/textbook taught that to my kiddo. suspect this is from some assessment book. :siao: maybe they all expect the kids to be entomologist in the making :yikes: