BISC Bioinformatics Quiz: MCQ!

2.

In many plant species, older roots and stems thicken by activity at ____.

Apical meristems
Cork cambium
Vascular cambium
Both b and c

Correct Answer

A. Both b and c

Explanation

In many plant species, older roots and stems thicken by activity at both the cork cambium and the vascular cambium. The cork cambium is responsible for the production of cork cells, which form the outer protective layer of the stem or root. The vascular cambium, on the other hand, is responsible for the production of secondary xylem and phloem, which contribute to the increase in girth or thickness of the plant. Therefore, both the cork cambium and the vascular cambium play a role in the thickening of older roots and stems in plants.

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3.

conducts water and mineral through a plant, and conducts sugars.

Phloem; xylem
Cambium; phloem
Xylem; phloem
Xylem; cambium

Correct Answer

A. Xylem; phloem

Explanation

Xylem is responsible for conducting water and minerals from the roots to the rest of the plant. It consists of long, tubular cells that are interconnected and form a network throughout the plant. On the other hand, phloem is responsible for conducting sugars, produced in the leaves through photosynthesis, to other parts of the plant. It consists of sieve tubes and companion cells that work together to transport the sugars. Therefore, the correct answer is Xylem; phloem.

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4.

Mesophyll consists of ____.

Waxes and cutin
Lignified cell walls
Photosynthetic cells
Cork but not bark

Correct Answer

A. Photosynthetic cells

Explanation

Mesophyll refers to the internal tissue of a plant leaf that contains chloroplasts, which are responsible for photosynthesis. Therefore, the correct answer is "photosynthetic cells" as it accurately describes the composition of the mesophyll tissue.

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1

5.

Which of the following cell types are alive in the mature tissue?

Collenchyma cells
Sieve tubes
Vessel members
Tracheids
Companion cells
Sclerenchyma cells

Correct Answer(s)

A. Collenchyma cells
A. Sieve tubes
A. Companion cells

Explanation

Collenchyma cells, sieve tubes, and companion cells are alive in the mature tissue. Collenchyma cells are elongated and provide support to the plant. Sieve tubes are part of the phloem and are responsible for transporting sugars and other organic molecules. Companion cells are closely associated with sieve tubes and provide metabolic support for their function.

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6.

In phloem, organic compounds flow through ____.

Collenchyma cells
Sieve tubes
Vessels
Tracheids

Correct Answer

A. Sieve tubes

Explanation

Phloem is responsible for the transport of organic compounds, such as sugars and amino acids, throughout the plant. Sieve tubes are the main components of phloem and are specialized for the efficient transport of these compounds. They are long, cylindrical cells with perforated end walls called sieve plates, allowing for the flow of sap containing organic compounds. The other options, collenchyma cells, vessels, and tracheids, are all types of cells involved in the transport of water and minerals in the xylem, not in the phloem. Therefore, the correct answer is sieve tubes.

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1

7.

Xylem and phloem are ____ tissues.

Ground
Vascular
Dermal
Both b and c

Correct Answer

A. Vascular

Explanation

Xylem and phloem are vascular tissues. Vascular tissues are responsible for the transport of water, nutrients, and sugars throughout the plant. Xylem transports water and minerals from the roots to the rest of the plant, while phloem transports sugars and other organic compounds from the leaves to the rest of the plant. Ground tissue, on the other hand, is responsible for functions such as photosynthesis, storage, and support. Dermal tissue is the outer protective covering of the plant. Therefore, the correct answer is vascular.

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8.

Tree rings occur when ____.

There are droughts during the time rings form
Environmental conditions influence xylem cell size
Heartwood alternates with sapwood

Correct Answer

A. Environmental conditions influence xylem cell size

Explanation

Tree rings occur when environmental conditions influence xylem cell size. The growth of tree rings is influenced by factors such as temperature, precipitation, and soil conditions. These environmental conditions affect the size of xylem cells, which are responsible for transporting water and nutrients throughout the tree. In favorable conditions, the xylem cells grow larger, resulting in wider tree rings. Conversely, in unfavorable conditions such as drought, the xylem cells may be smaller, leading to narrower tree rings. By studying tree rings, scientists can gain insights into past environmental conditions and climate patterns.

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9.

Bark is mainly ____.

Periderm and cork
Cork and wood
Periderm and phloem
Cork cambium and phloem

Correct Answer

A. Periderm and phloem

Explanation

The correct answer is periderm and phloem. The periderm is the outer protective layer of the bark, while the phloem is responsible for transporting sugars and other nutrients throughout the plant. Both of these components are essential for the functioning and protection of the plant.

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1

BISC Bioinformatics Quiz: MCQ!

Roots and shoots lengthen through activity at ____.

Quiz Preview

In many plant species, older roots and stems thicken by activity at ____.

conducts water and mineral through a plant, and conducts sugars.

Mesophyll consists of ____.

Which of the following cell types are alive in the mature tissue?

In phloem, organic compounds flow through ____.

Xylem and phloem are ____ tissues.

Tree rings occur when ____.

Bark is mainly ____.

BISC Bioinformatics Quiz: MCQ!

Roots and shoots lengthen through activity at ____.

Quiz Preview

In many plant species, older roots and stems thicken by activity at ____.

____ conducts water and mineral through a plant, and ____ conducts sugars.

Mesophyll consists of ____.

Which of the following cell types are alive in the mature tissue?

In phloem, organic compounds flow through ____.

Xylem and phloem are ____ tissues.

Tree rings occur when ____.

Bark is mainly ____.

conducts water and mineral through a plant, and conducts sugars.