Workbook Answers 7.4

A

1.     False

2.     False

3.     False

4.     True

5.     False

B

1.     A

2.     D

3.     D

4.     B

5.     D

   6.     C

   7.     A

8.     B

C

1.     (a)    carbon dioxide

(b)    water

(c)    food

(d)   oxygen

(e)    starch

   2.     (a)    feeding

(b)    photosynthesis

(c)    producers

(d)   green plants

        (e)    consumers

D

1.     (a)    A:    II

B:    IV

C:    I

D:    III

        (b)    C → D → B → A

        (c)    Dark blue

        (d)   This leaf has carried out photosynthesis.

   2.     (a)    Chlorophyll

        (b)    (i)     Presence of starch in the leaf

(ii)    1.     Destarch a potted plant with variegated leaves by putting it in the dark for 1 or 2 days.

2.       Put the potted plant under bright light for an hour.

                        3.     Remove a variegated leaf from the plant and carry out the iodine test on it.

                (iii)   The green part becomes dark blue; The non-green part remains as brown        

                       

        (c)    Chlorophyll is necessary for photosynthesis.

   3.     (a)   

Producer	Consumer (feed on plants directly)	Consumer (feed on plants directly)
Grass, trees (or other reasonable answers)	rabbit, zebra, grasshopper, bird (any two)	lion, snake (or other reasonable answer)

        (b)    (i)                     eaten by                           eaten by

---->
        grass                               zebra        ----------->                        lion

                (ii)                    eaten by                           eaten by

        grass          ------>            rabbit       ------------>                       snake

        (or other reasonable answers)

        (c)    (i)     Light energy

(ii)    chemical energy

                (iii)   chemical energy in animals