Answer:
They have helical thickening of lignin in their walls to prevent collapse
Explanation:
the primary function of Xylem and its conducting vessels tracheids is to provide support and tranport water and minerals in plants.
Xylem vessels have layers of dead materials in the walls called LIGNIN. Lignin is a polymer; a very strong, hard materials that stop water passage through it,because it contains dead cells,
Therefore the presence of deposit of these strong impermeable, ligified walls in its walls prevent its collapse during mass flow of water of transpiration pull.
Answer:
A. Photosynthesis
Explanation:
Photosynthesis is a process in plants produce food materials by absorbing carbondioxide from the atmosphere which decreases the concentration of carbondioxide in the atmosphere. In photosynthesis reaction, plant take water from the soil and carbondioxide from the atmosphere in the presence of sunlight produces glucose and oxygen. Glucose is stored in different parts of plant such as grains, stem and roots while oxygen is released in the atmosphere.
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Answer: 3
Explanation:
Given :
numC = 12
while numC > 3:
numC = numC / 2
Initial value of numC = 12
The condition checks if the value of numC is greater than 12, only then will the statement be executed and the loop isn't altered
numC = 12 is greater Than 3 ;
numC = numC/2 = 12/2 = 6
numC is now 6 ;
numC = 6 is greater than 3
numC = numC / 2 = 6/2
numC is now 3
numC = 3 is not greater than 3 ; hence, loop terminates (condition isn't met)
Hence , numC = 3
