Question

1. Choose the correct option
a) Which of the following tissues enables grass to grow back once it has been cut? (I)Apical meristem
(ii) Lateral meristem
(iii) Intercalary meristem
(iv) vertical meristem
(b) Plasmolysis in a plant cell is defined as
(I) the lysis of plasma membrane in a hypotonic medium
(ii) the shrinkage of the cytoplasm in a hypertonic medium
(iii) the shrinkage of the nucleoplasm
(iv) none of these
2. Answer the following in 10-20 words:
a) Explain how the exchange of gases occurs across the plasma membrane of cells. b) List two important functions of columnar epithelium.​

Answer 1

Answer:

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Answer 2

Answer:

1. a) (iii)

b) (iv)

2. a) The basic mechanism of gas exchange is diffusion across a moist membrane. Diffusion is the movement of molecules from a region of greater concentration to a region of lesser concentration, in the direction following the concentration gradient.

b) (i)Simple columnar epithelia with microvilli secrete digestive enzymes and absorb digested food. (ii) Simple columnar epithelia with cilia aid in the movement of mucus and reproductive cells.