Question

Investigate the conditions required for seeds to germinate. Set up your
apparatus as shown in figure. Keep the dishes at room temperature for a week.
Explain your observations.
Soaked peas/seed, Soaked peas/seed, Soaked peas/seed,
(5 marks)
Dry cotton wool Wet cotton wool Covered with water

Answer 1

Answer:

Given

a

2

=13 and a

5

=25

We know that

a

n

=a+(n−1)d

∴a

2

=a+(2−1)d

⇒13=a+(2−1)d

⇒a+d=13 ...(i)

and a

5

=a+(5−1)d

⇒25=a+4d

⇒a+4d=25 ...(ii)

Now, subtracting (i) from (ii), we get

3d=12

⇒d=4

Now a+d=13 [from (i)]

⇒a=9

Hence, a

7

=a+6d=9+6(4)

⇒a

7

=33

Answer 2

Explanation:

To prove that water is necessary for germination.

Apparatus: Two beakers marked A and B, seeds of Pea,water and cotton wool.

Procedure:  Take two beakers which are marked A and B respectively.In beaker B  place some pea seeds on a wet cotton wool and in beaker A pace some pea seed on a dry cotton wool. Keep the beakers at room temperature.

Observation: The seeds in beaker B germinate and in A do not germinate.

Result: Water is necessary for germination.

Covered with water =  RESULT DON,T KNOW

IT IS CORRECT ANSWER