Physics : 20 Numbers of Multiple Choices Grade 9

Hi,

I have another 20 questions for you to practice.

As usual, if you have any question about this worksheet, please write it in the comment section below.

I will answer it in a simplest way that I can.

Warm regards,

Dee

Physics : 12 Questions About Speed, Velocity, and Acceleration

Hi,

Hereby, I uploaded a number of physics questions about speed, velocity, and acceleration.

If you want some explanation about a certain number, please don't be hesitate to write it in a comment section. I'll explain it to you in the easiest way that I can. :)


Cheers,

Dee

Biology : Explanation About Movement of Substances

1.  Define Diffusion!

      -. Diffusion is the movement of particles from a higher concentration region to 

         a lower concentration region (or can be called as "down a concentration 

         gradient").

2.  Discuss the importance of diffusion in nutrient uptake and gaseous exchange in 

     plants and humans!

      -. Diffusion is important for humans because the lungs' cells exchange oxygen and

         carbon dioxide through diffusion. Moreover, digested food substances, such as

         amino acids and glucose diffuse through the villi into the blood capillaries.

      -. For plant cells, diffusion is used for oxygen intake and carbon dioxide removal.

3.  Define Osmosis!

      -. Osmosis is the movement of water molecules from a higher water potential 

         solution to a lower water potential solution, across a partially permeable 

         membrane.

4.  Discuss the effects of osmosis on plant and animal tissues!

      -. When placed in a low water potential solution, animal cells will shrink and have
         little spikes appear on the cell surface membrane. The crenated cell will 
         become dehydrated and, eventually, die.      

      -. When placed in a high water potential solution, animal cells will swell and
          burst.

      -. For plant cells, its cytoplasm will shrink away from the cell wall when it placed
         in a low water potential solution due to outward osmotic flow of water.
         This event called plasmolysis which causes tissues to become limp or flaccid.
         Plant cells will be killed if they remain plasmolysed for too long.

      -. When plant cells place in a high water potential solution, such as distilled 
          water, its vacuole will increase in size as water is going in and push the cell 
          contents against the cellulose cell walls. Since the cell wall is strong and 
          relatively inelastic, it prevents over-expansion of the cell and, also, prevents 
          the entry of more water. The plant cells will expand and become turgid.

PS : *. The turgor pressure, that keeps the cell turgid, helps to maintain the shape of 
          soft tissues in plant and keep them firm and erect. The surrounding cells pushed
          against each other creating support for the plant.
      *. Other function of the turgor pressure :
               a). To make some flowers open during the day and close at night.
               b). Due to the changes in turgor of the guard cells, the stomata in the plant
                    opens and closes.
               c). The changes in turgor of cells in the small swellings at the base of
                    the leaflets of mimosa plant causes them to fold when they are touched.

5.  Define Active Transport!
      -. Active Transport is the substances movement against a concentration gradient
         which is from a lower concentration region to a higher concentration region;
         and it is an energy-consuming process.
      -. Example : It is important for root hair cells to absorb dissolved mineral salts and 
         for the small intestine cells to absorb glucose and amino acids.  

Mathematics : Practice Quadratic Equation Grade 8

Hi,

Hopefully you'll find this worksheet useful.

If you any question, please leave it in the comment section below. I'll explain it an easiest way possible.


Cheers,
Dee

--------


1.   Expand:
   (a).   ( a + 3 )2

   (b).   ( a - 5 )2

   (c).   ( 2c + 3d ) ( 3c + 4d )
   (d).   ( 2a + 5b ) ( 2a - 5b )
   (e).   5a ( b + c) + 3b ( a - b )

2.   Factorise:
   (a).      x² –  4x  +   4 =
   (b).   25x – 10y + 50 =
   (c).     x² – 16 =

3.   Solve the equation ( x + 4 ) ( x - 11 ) = 0 !

4.   Fill up the missing words:
   (a).   The equation of the y-axis is ____________
   (b).   The line of ______________ of the graph of the quadratic
            equation is passing through its maximum or minimum points.

Mathematics : 10 Nomor Soal Latihan Matematika Kelas 6 SD

Hai,

Ini ada soal-soal lagi untuk latihan Matematika kelas 6 SD.
Semoga dapat membantu.

Apabila kalian merasa kesulitan mengerjakannya, silahkan tulis pertanyaannya di komen dan nanti saya akan membantu menjelaskannya.

Selamat mengerjakan!

Mathematics : 30 Nomor Soal Latihan Matematika Kelas 6 SD

Hai,

Ini adalah soal-soal latihan Matematika untuk kelas 6 SD.

Apabila kalian merasa kesulitan mengerjakannya, silahkan tulis pertanyaannya di komen dan nanti saya akan membantu menjelaskannya.

Selamat mengerjakan! 😁

Just Chit Chat: SMILE

"Everytime you SMILE at someone, it is an ACTION of LOVE, a GIFT to that person, a beautiful thing."

Wow! What a hard day!
Drained me up, emotionally...

Nowadays, it is more and more difficult for me to smile as bright as I used to.
I, also, don't feel as safe as I used to. My colleagues can get to my position anytime when I am careless. So tiring.... :(

But then, I remember that I'm not the only one with that kind of feeling.
Every people I met is facing their own battle which also drain them up both emotionally and physically.

I can't help them with their fight, like they can't help mine.
All I can do is to help them feel better, even just for awhile, with my simple smile to them. 

Like what Mother Teresa said:
"We shall never know all the good that a simple smile can do."

Don't forget to smile! ^^