- You are provided with two potato cylinders and solutions labeled X and Y of different concentrations.
- Place one potato cylinder in solutionX and another in solution Y.
- Leave the set – up for 30 minutes.
- Remove each of the cylinders from solutions X and
- Press each of the cylinders gently between your fingers and note the texture in each case.
-
- Record the texture of each cylinder in solutions X and Y.
Solution X:…………………………. (1mk)
Solution Y: ………………………… (1mk) - Account for the observation made for the potato cylinder placed in solution X. (3mks)
- State the nature of the cells of the cylinder placed in solution Y. (1mk)
- Record the texture of each cylinder in solutions X and Y.
-
- What observation would be expected if the potato cylinder were boiled before being placed in the solutions? (1mk)
- Give an explanation for your answer in b (i) above. (2mks)
- Which potato cylinder is likely to increase in length? (1mk)
- Explain what will happen to the red blood cell when placed in solution X. (1mk)
-
- You are provided with photographs of specimens labeled L and S. Examine them.
- State the conditions under which each set was grown:
Set L …………………………………………………………………... (1mk)
Set S ………………………………………………………………….. (1mk) -
- Name the part labeled G in specimen (1mk)
- What is the role of the part named in b(i) above. (1mk)
- Explain how part G straightens to enable the seedling grow upright. (2mks)
- State two functions of the part labeled (2mks)State three differences between seedlings in set L and S. (3mks)
Set L
Set S
(i)
(ii)
(iii)
- State the role of the following in germination.
- Air
- Water
- State the biological significance of the phenomenon exhibited by the seedling in set – up (1mk)
- State the conditions under which each set was grown:
- You are provided with specimens labeled K and L obtained from the same mammal.
-
- Identify specimens K and L (2mks)
- State the functions of specimens K and L. (2mks)
- Give two adaptations of specimen L to its function. (2mks)
- Give three differences between specimens K and (3mks)
Specimen K
Specimen L
(i)
(ii)
(iii)
- Draw and label the parts of specimen (4mks)
- Explain how tooth decay occurs. (2mks)
-
Join our whatsapp group for latest updates
Tap Here to Download for 50/-
Get on WhatsApp for 50/-
Download BIOLOGY PAPER 3 - KCSE 2019 JOINT PRE MOCK EXAMINATION NAMBALE.
Tap Here to Download for 50/-
Get on WhatsApp for 50/-
Why download?
- ✔ To read offline at any time.
- ✔ To Print at your convenience
- ✔ Share Easily with Friends / Students