Transport in Plants - Online Test
Q1. Which of the following statement is true with respect to the movement through apoplast?
Answer : Option D
Explaination / Solution:
The apoplastic movement of water occursexclusively through the intercellular spaces and the walls of the cells. Movement through the apoplast does not involve crossing the cellmembrane. This movement is dependent on the gradient. The apoplast does not provide any barrier to water movement and water movement is through mass flow.
Q2. In diffusion, the movement of molecule across typical plant cell takes about
Answer : Option D
Explaination / Solution:
Long distance transport of substances within a plant cannot be by diffusion alone. Diffusion is a slow process. It can account for only short distance movement of molecules. For example, the movement of a molecule across a typical plant cell (about 50 μm) takes approximately 2.5 s.
Q3. The pathway of water passes from root hairs to xylem through the walls of intervening cells without crossing any membrane or cytoplasm is called
Answer : Option B
Explaination / Solution:
The apoplast is the system of adjacent cell walls that is continuous throughout the plant, except at the casparian strips of the endodermis in the roots.
Q4. Symplastic movement is aided by
Answer : Option B
Explaination / Solution:
Symplastic movement may be aided by cytoplasmic streaming. We can observed cytoplasmic streaming in cells of the Hydrilla leaf.
Q5. In plant cell, the cytoplasm of the adjacent cells are connected through bridges called
Answer : Option C
Explaination / Solution:
Plasmodesmata is a narrow thread of cytoplasm that passes through the cell walls of adjacent plant cells and allows communication between them.
Q6. The ingredient not used for preserving food stuff is
Answer : Option A
Explaination / Solution:
For preserving food stuff vinegar, salt and sugar is used. Ethanol is antiseptic in nature but not used for preserving food stuff.
Q7. Main function of lenticel is
Answer : Option C
Explaination / Solution:
Lenticels are minute pore in stems through which exchange of gases takes place between plant and atmosphere.
Q8. In wall of guard cell, cellulose microfibrils are arranged
Answer : Option B
Explaination / Solution:
The cells surrounding the stomata pore is called guard cell. It is bean shaped in dicots and dumbbell shape in monocots. Cellulose microfibrils are arranged radially in guard cell.
Q9. Special structures found on margins and tips of leaves made of parenchyma tissue and water pores through which guttation take place.
Answer : Option D
Explaination / Solution:
A hydathode is a type of secretory tissue in leaves, commonly found in angiosperms, that secretes water through pores in the epidermis or leaf margin, typically at the tip of a marginal tooth or serration.
Q10. In plant cell, the cytoplasm of the adjacent cells are connected through bridges called
Answer : Option D
Explaination / Solution:
The cytoplasm of two adjacent cells are connected through a bridge plasmodesmata. Movement of substance in plants takes place through this plasmodesmata.
