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Q 1/12
Score 0
Which of the following statements correctly distinguishes between the functions and characteristics of xylem and phloem in vascular plants?
30
Xylem transports water and minerals upwards through dead tracheids and vessel elements, while phloem transports sugars in both directions through living sieve-tube elements.
Xylem provides the plant's outer protective coating known as the epidermis, while phloem is responsible for structural support in the woody stem.
Xylem is composed of living cells that use active transport to move glucose, while phloem consists of dead cells that facilitate transpiration.
Xylem transports nutrients from the leaves to the roots only, while phloem transports water from the roots to the rest of the plant using capillary action.
Q 2/12
Score 0
In the context of plant anatomy, which tissue type is primarily responsible for preventing water loss and providing a physical barrier against pathogens, and which specific structure does it often secrete?
30
Ground tissue; the mesophyll
Vascular tissue; the xylem
Dermal tissue; the cuticle
Dermal tissue; the phloem
12 questions
Q.
Which of the following statements correctly distinguishes between the functions and characteristics of xylem and phloem in vascular plants?
1
30 sec
Q.
In the context of plant anatomy, which tissue type is primarily responsible for preventing water loss and providing a physical barrier against pathogens, and which specific structure does it often secrete?
2
30 sec
Q.
Which specific cell type in the phloem is responsible for maintaining the metabolic functions of the sieve-tube elements, even though it does not directly participate in the bulk flow of sap?
3
30 sec
Q.
Which of the following best describes the organization of vascular tissues in a typical eudicot stem compared to a monocot stem?
4
30 sec
Q.
When a tree is 'girdled' by removing a complete circular strip of bark down to the wood, the tree eventually dies because the flow of nutrients is interrupted. Which specific tissue is being removed to cause this disruption in nutrient transport?
5
30 sec
Q.
Which specialized structures of the dermal tissue are found on the surface of leaves and function to regulate gas exchange and minimize transpiration through the control of the stomatal pore?
6
30 sec
Q.
Which component of the vascular tissue is primarily responsible for the transport of minerals like phosphorus and nitrogen from the soil, and does this process require the cells to be living or dead at functional maturity?
7
30 sec
Q.
Which of the following describes a key structural difference between tracheids and vessel elements in the xylem?
8
30 sec
Q.
In terms of evolutionary biology and plant classification, which statement correctly distinguishes tracheids from vessel elements?
9
30 sec
Q.
Which specific property of tracheids and vessel elements prevents these cells from collapsing under the extreme negative pressure required for transpiration?
10
30 sec
Q.
Which of the following statements best describes the functional relationship between sieve tube elements and companion cells in the phloem?
11
30 sec
Q.
Which of the following cellular components is typically absent in a mature sieve tube element but present in its associated companion cell?
