(ii)N [1m] ________________________________________________________________________ e)Explain the role of L in maintaining cell turgidity [2m] ________________________________________________________________________ ________________________________________________________________________ f)Name a cell which is rich in structure N and give your reason. [2m] ________________________________________________________________________ ________________________________________________________________________ 2a)What are unicellular organisms and how do they differ from multicelluar organisms in terms of cell organisation? [2m] b) Amoeba sp. is a unicelluar organism which can be found in freshwater ponds rich in decaying organic matter. Explain how freshwater Amoeba sp adapts to living freshwater environment. [4m] c)Explain how Amoeba sp. reproduces in response to different conditions in environment. [4m] d)
Unicellular organisms do not require a transport system.
Using Amoeba sp as example, give an evaluation of the above statement based on the physical features of a unicellular organism with respect to the following processes: -Locomotion -Nutrition -Respiration [10m]
Chapter 2 Cell Structure and Cell Organisation
Figure 1 shows the structure of a type of plant cell.
Which of the following accurately describes the cell and its location in the plant?
Cell that is dividing in the cell root meristem
Leaf epidermis cell
Root hair cell
Leaf mesophyll cell
Figure 2 shows the leaf cross-section of a green plant.
After exposure to a bright light, among parts
, which contains the moststarch?
The function of the plasma membrane in a cell is
to protect the cell nucleus
to control the in and out movement of solutes
to produce energy in the cell
to control cell activity
In a dicotyledonous leaf, photosynthesis does
the epidermis cells
the palisade mesophyll cells
the sponge mesophyll cells
the guard cells1