EKB-Lecture 1

•What will visibly happen to a plant if cell turgidity is not maintained?

The flowers will drop off.
The leaves will turn yellow.
The surface area of the leaves will expand.
The stem will grow at a faster rate.
The leaves and the plant will wilt.

•A cell sample was taken from a plant and found to have lignin, suberin, and cutin. Where was this sample collected from? What do these substances provide?

A stem, structural support
A fruit, structural support
The roots, physiological support
A woody stem, physiological support

•Which of the following is not one of the main components that provide plant tissues with support?

Cellulose
Lignin
Suberin
Chlorophyll

•Which of the following best compares the roles of cellulose and cutin in a plant cell?

Cellulose is the main component of the cell membrane that allows it to be flexible and permeable, and cutin primarily acts as a strengthening material.
Cellulose is the main component of the cell wall that provides support and structure, and cutin primarily acts as a waterproof barrier.
Cutin is the main component of the cell wall that provides support and structure, and cellulose is the main component of the cell membrane that allows it to be flexible and permeable.

•Both …………. and …………. can be deposited on the external layers of the stem to provide structural support.

cutin, lignin
suberin, cutin
cellulose, suberin
cellulose, cutin

•The simple diagram provided shows a plant cell increasing in turgidity. As the turgidity of a plant cell increases, what happens to the turgor pressure?

It remains constant.
It decreases.
It increases.

•Which of the following is the major component of plant cell walls that has the primary function of providing support to the cell?

Starch
Cellulose
Collagen
Glycogen
Glucose

•What is the primary role of cutin and suberin in plants?

To maintain the shape of cell walls
To provide structure and support to the vascular tissues
To act as impermeable and waterproof barriers
To determine what enters and leaves the plant cells
To maintain the shape of the reproductive organs

•Which of the following is a polymer found in the cell walls of vascular tissue, such as the xylem, to provide additional structural support?

Lignin
Keratin
Lactose
Collagen
Glycogen

•The diagram provided shows how cells can increase their turgidity. By what process does water move into the vacuole of the cell?

Facilitated diffusion
Active transport
Exocytosis
Endocytosis
Osmosis

Which of the following tables correctly differentiates between examples of structural and physiological support in plants?

A
B

•Sclerenchyma tissues have a role only in physiological support. Is this statement correct? Why?

The statement is correct because sclerenchyma tissues have only a main role in the development and growth of plants.
The statement is incorrect because sclerenchyma tissues are mainly involved in structural support.
The statement is correct because sclerenchyma tissues are mainly involved in reproduction in plants.
The statement is incorrect because sclerenchyma tissues do not have any role in plant support.

•A cross section of a herbaceous plant stem is taken. Which of the following substances is not present in the inner layers?

Starch granules
Cellulose
Lignin
Suberin

• Dried peas are usually wrinkled and smaller in size than water-soaked peas because ………

of lignin deposition on their cells
of the cellulose present in their cell wall structure
of the loss of cell turgidity
their guard cells are always open

•A student introduced a sample of plant root tissue to a high-salinity solution. What did she observe?

No effect on the cell structure in the tissue sample
Shrinkage of the vacuoles of cells
Swelling of the vacuoles of cells
Swelling of the root hair cells

•The stem cortex has two types of cells: sclerenchyma cells and collenchyma cells. Which of these two types provides support to the plant?

Collenchyma cells
Sclerenchyma cells
Neither of them
Both of them

•Plant cells can take in large amounts of water and swell up. What component of the plant cell wall allows this change in shape to occur without letting the cell burst?

Chitin
Cellulose
Collagen
Fibrin

•Which of the following is not an adaptation found in desert plants to maintain cell turgidity?

Leaves that are modified into spines to reduce the surface area for transpiration
Thick cuticles to prevent water loss
Smaller leaves with fewer stomata
Smaller cell vacuoles to provide more space inside the plant cells

• What is the primary function of structural support materials in plants?

To increase the rate at which materials pass through the plant
To allow flexibility and movement for the plant
To maintain the shape of the plant and the plant cells
To control which substances enter and leave plant cells

•Which of the following is not a type of simple plant cell?

Sclerenchyma
Mesenchyma
Parenchyma
Collenchyma

sec 3 – ch 1: Support and movement in living organisms

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