i) Balsam plant X grew taller while balsam plant Y wilted. This indicates that plant X received sufficient water while plant Y was not watered adequately. ii) In investigations, the only variable that should be kept the same is watering. iii) For plant Y to grow healthy, it needs to be watered adequately like plant X. iv) From this investigation, we can conclude that water is essential for plant growth and insufficient water causes plants to wilt.

1. À̾¢ B
[ 20 ÒûÇ¢¸û]
1. Diagram 1 shows an investigation that is carried out by Ahmad
À¼õ 1, «Á¡ð §Áü¦¸¡ñ¼ ¬öÅ¢¨Éì ¸¡ðθ¢ýÈÐ .
¦¿¸¢Æ¢ô ¨À
¸¡º¢Ðõ¨À A
¸¡º¢Ðõ¨À B
À¼õ 1
Both plants are watered every day. After five days, Ahmad found that
þÃñÎ ¾¡ÅÃí¸ÙìÌõ ´§Ã «ÇÅ¢ø °üÈôÀð¼Ð. 5 ¿¡ð¸û ¸Æ¢òÐ «Á¡ð ¸£úì¸ñ¼ Å¢ÀÃí¸¨Çì
¸ñ¼È¢ó¾¡ý .
1. Balsam Plant X grew taller
¾¡ÅÃõ A ¯ÂÃÁ¡¸ ÅÇ÷ó¾¢Õó¾Ð .
2. Balsam plant Y wilted
¾¡ÅÃõ B Å¡Ê¢Õó¾Ð .
What can you infer about balsam plants X and Y ?
«) ¾¡ÅÃõ A ÁüÚõ ¾¡ÅÃõ B ¢ý ÅÇ÷ ¿¢¨ÄìÌ ¯ÉÐ «ÛÁ¡Éõ ±ýÉ ?
i)
ii)
balsam plant X
¾¡ÅÃõ A: ..................................................................................................................
balsam plant Y
¾¡ÅÃõ B: ..................................................................................................................
( 2 ÒûÇ¢ )
b) In this investigation, state what should be kept the same?
þôÀ⧺¡¾É¢ø ¸ðÎôÀÎò¾ôÀð¼ Á¡È¢ ±ýÉ ?
_________________________________________
( 1 ÒûÇ¢)

2. c) What should be done for plant Y to grow healthy ?
¾¡ÅÃõ B ¬§Ã¡ì¸¢ÂÁ¡¸ Å¡Æ ±ýÉ ¦ºö §ÅñÎõ .?
_____________________________________________________
( 1ÒûÇ¢ )
d) What can you conclude from the investigation. ?
þó¾ ¬öÅ¢ý ÓÊ× ±ýÉ ?
___________________________________________________________
( 1 ÒûÇ¢ )

3. 3. In an investigation, three grasshoppers are put into each of two similar glass container
The opening of glass container P is covered with a wire gauze. The opening of glass
container Y is covered with a plastic lid as shown in diagram 2. Both containers are
left for several days.
µ÷ ¬öÅ¢ø , ´§Ã Á¡¾¢Ã¢Â¡É þÃñÎ ¸ñ½¡Êô À¡ò¾¢Ãò¾¢ø ãýÚ ¦Åðθ¢Ç¢¸û
§À¡¼ôÀð¼É. À¡ò¾¢Ãõ P ŨÄì ¸õÀ¢Â¡Öõ .À¡ò¾¢Ãõ Q ¦¿¸¢Æ¢ô ¨À¡Öõ 5
¿¡ð¸ÙìÌ ã¼ôÀð¼Ð .
.
¦¿¸¢Æ¢ô ¨À
ŨÄì¸õÀ¢
ŨÄì¸õÀ¢
¸ñ½¡Êô
À¡ò¾¢Ãõ
þ¨Ä
P
Q
À¼õ 2
Diagram 2
a)
The grasshopper in which container will die first ?
±ó¾ô À¡ò¾¢Ãò¾¢ø ¯ûÇ ¦ÅðÎ츢Ǣ Å¢¨ÃÅ¢ø ÁÊÔõ ?
___________________________________________________________________________
( 1 ÒûÇ¢ )
b) Give a reason for your answer in (a) ?
a –Å¢¨¼Â¢ø ¯ý À¾¢Öì¸¡É ¸¡Ã½ò¨¾ì ÜÚ ?
__________________________________________________________________________
( 1ÒûÇ¢)

4. c) What must be changed in this investigation ?
þó¾ ¬öÅ¢ø ¸ðÎôÀÎò¾ôÀð¼ Á¡È¢ ±ýÉ ?
___________________________________________________________________________
( 1 ÒûÇ¢)
d) State the conclusion of this investigation ?
þó¾ ¬öÅ¢ý ÓÊ× ±ýÉ ?
____________________________________________________________________________
( 2 ÒûÇ¢ )
2

5. 4. Diagram 3 shows beakers p and Q used in an investigation. The beakers are
left a side for a few days
À¼õ 3 , µ÷ ¬ö¨Åì ¸¡ðθ¢ýÈÐ .
5.
.
±ñ¨½
¿£÷
Å¢¨¾
¦¸¡¾¢ò¾
¿£÷
À¼õ 3
a) Predict the observations in beakers P and Q at the end of investigation
À¼õ 3ø ¦¸¡Îì¸ôÀð¼ ÝƨÆì ¦¸¡ñÎ ´Õ °¸ò¨¾ ±Øи
___________________________________________________________
( 1ÒûÇ¢)
b) State an inference based on the answer in (a).
§Áü ÌÈ¢ôÀ¢ðôÀð¼ ¯ý À¾¢ÖìÌ ²üÈ µ÷ «ÛÁ¡Éò¨¾ ±Øи
______________________________________________________________.
( 1ÒûÇ¢)
b) State the following variable
þôÀ⧺¡¾¨É¢ø :
i)
manipulated variable
¾üº¡÷Ò Á¡È¢ __________________________________________
ii)
responding variable
º¡÷Ò Á¡È¢ :__________________________________________________
( 2ÒûÇ¢ )
d) State the reason of using boiling oil in beaker Q.
¸Äý Q Å¢ø ±ñ¨½ ÀÂýÀÎò¾ôÀð¼¾ý §¿¡ì¸õ ±ýÉ ?.
_________________________________________________________________
( 1 ÒûÇ¢ )

7. 4.
Diagram 4 shows two pots of plants, P and Q were put in a garden. The
surface of leaves of plant q were coated with grease. Both of plants were watered
twice a day
À¼õ 4, P ÁüÚõ Q ¬¸¢Â ¾¡ÅÃí¸¨Çì ¸¡ðθ¢ýÈÐ. Q ¾¡ÅÃò¾¢ý þ¨Ä¢ø
ÁºÌ ±ñ¨½ âºôÀð¼Ð .þÕ ¾¡ÅÃí¸ÙìÌõ 2 ¿¡ð¸û ¿£÷ °üÈôÀð¼Ð.
ÁºÌ ±ñ¨½
âºôÀð¼ þ¨Ä
À¼õ 4
Diagram 4
What will happen to the plants after two weeks ?
a)
þÃñÎ Å¡Ãí¸ÙìÌô À¢ÈÌ P ÁüÚõ Q ¬¸¢Â
¾¡ÅÃí¸Ç¢ý ¿¢¨Ä ±ýÉ ?
Plant P
¾¡ÅÃõ P : ____________________________
Plant Q
¾¡ÅÃõ Q : ____________________________
( 2 ÒûÇ¢ )

8. b)
State one inference to explain your answer for plant Q in (a).
¾¡ÅÃõ Q-Å¢ý ¿¢¨Äì¸¡É ¯ý °¸ò¨¾ ±Øи .
____________________________________________________
( 1ÒûÇ¢)
c) State one controlled variable in this experiment.
þó¾ ¬öÅ¢ø ÀÂýÀÎò¾ôÀð¼ ¸ðÎôôÎò¾ôÀð¼ Á¡È¢ ´É¢¨Éì ÌÈ¢ôÀ¢Î¸
_________________________________________________________
d)
( 1 ÒûÇ¢ )
State the importance of sunlight to plants.
¾¡ÅÃò¾¢üÌ Ý⠴Ǣ¢ý «Åº¢Âò¨¾ ´ý¨Èì ÌÈ¢ôÀ¢Î¸
_________________________________________________________
4
( 1ÒûÇ¢)