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Plant Biology Basics
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Plant Biology Basics
Plant Biology Basics
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1
Question
What is botany?
Answer
Botany is the study of plants, including plant structure, function, reproduction, diversity, inheritance, and more.
2
Question
How do plants contribute to the environment?
Answer
Plants remove carbon dioxide from the atmosphere, helping to keep the planet from getting too warm for life. They provide homes for insects and other animals, filter impurities out of ground water, and help protect shorelines from erosion.
3
Question
What is a tissue in the context of plant biology?
Answer
A tissue is a group of cells, consisting of one or more cell types that together perform a specialized function.
4
Question
What are the main organs of a plant?
Answer
The main organs of a plant are the Root, Stem, Leaves, and Flowers.
5
Question
What are nutritive organs in plants?
Answer
Nutritive organs, such as the Root, Stem, and Leaves, are specially concerned with the nourishment of the plant.
6
Question
What are reproductive organs in plants?
Answer
Reproductive organs, such as Flowers, are connected with the production of fruit and seed, and the continuance of the species.
7
Question
What are the three tissue systems in plants?
Answer
The three tissue systems in plants are dermal, vascular, and ground tissues.
8
Question
What is the function of dermal tissue?
Answer
The dermal tissue system is the plant's outer protective covering, forming the first line of defense against physical damage and pathogens.
9
Question
What is the cuticle and its function?
Answer
The cuticle is a waxy coating on the epidermal surface of leaves and most stems, helping to prevent water loss.
10
Question
What are xylem and phloem?
Answer
Xylem conducts water and dissolved minerals upward from roots into the shoots, while phloem transports sugars from where they are made (usually the leaves) to where they are needed (usually roots and sites of growth).
11
Question
What is the arrangement of the stele in angiosperms?
Answer
In angiosperms, the root stele is a solid central vascular cylinder of xylem and phloem, while the stele of stems and leaves consists of vascular bundles, separate strands containing xylem and phloem.
12
Question
What is the ground tissue system?
Answer
The ground tissue system includes tissues that are neither dermal nor vascular and is involved in functions such as storage, photosynthesis, and support.
13
Question
What is the difference between parenchyma, collenchyma, and sclerenchyma cells?
Answer
Parenchyma cells have thin, flexible walls and perform metabolic functions; collenchyma cells have thicker primary walls for flexible support; and sclerenchyma cells have thick secondary walls and provide rigid support.
14
Question
What are meristems?
Answer
Meristems are perpetually undifferentiated tissues in plants that divide when conditions permit, leading to new cells that can elongate.
15
Question
What are the two main types of meristems?
Answer
The two main types of meristems are apical meristems and lateral meristems.
16
Question
What is primary growth in plants?
Answer
Primary growth is the process that allows roots to extend throughout the soil and shoots to increase their exposure to light, facilitated by apical meristems.
17
Question
What is secondary growth in plants?
Answer
Secondary growth is the growth in thickness caused by lateral meristems, such as the vascular cambium and cork cambium.
18
Question
How are flowering plants categorized based on their life cycle?
Answer
Flowering plants can be categorized as annuals (complete their life cycle in a year or less), biennials (require two growing seasons), or perennials (live many years).
19
Question
What are the two types of water-conducting cells in the xylem?
Answer
The two types of water-conducting cells in the xylem are tracheids and vessel elements.
20
Question
What is the function of sieve-tube elements in the phloem?
Answer
Sieve-tube elements transport sugars and other organic nutrients, and they lack a nucleus and ribosomes to facilitate nutrient flow.
21
Question
What is the role of companion cells in the phloem?
Answer
Companion cells assist sieve-tube elements by providing necessary cellular functions and helping load sugars into the sieve-tube elements.
22
Question
What feature is unique to phloem sieve tubes compared to xylem vessels?
Answer
The cell membrane remains intact in a mature functioning phloem sieve tube cell.
23
Question
What is the function of sclereids and fibers in plants?
Answer
Sclereids are specialized for support and impart hardness to nutshells and seed coats, while fibers are long, slender, and used for support and commercial purposes.
24
Question
What happens to the living cellular contents of tracheids and vessel elements at maturity?
Answer
The living cellular contents disintegrate, leaving behind the thickened walls to form a nonliving conduit for water transport.
25
Question
What is the relationship between primary and secondary growth in plants?
Answer
Primary growth occurs in the apical meristem and extends shoots, while secondary growth increases thickness in parts that have previously grown, facilitated by lateral meristems.
26
Question
What contributes to the mechanical support of the stem in plants?
Answer
The cell contributes to the mechanical support of the stem.
27
Question
What is the most common ground tissue in plants?
Answer
A. Cortex B. Epidermis C. Collenchyma D. Parenchyma
28
Question
Which type of meristematic tissue is responsible for the increase in girth of the plant?
Answer
C. Lateral meristem
29
Question
What are the living and non-lignified components of vascular bundles?
Answer
A. vessel tracheid. B. vessel phloem. C. wood fibers phloem. D. wood parenchyma phloem.
30
Question
Which combination of characteristics of a vessel element are most important for water movement in the xylem?
Answer
A. Rigid cell wall, cell dead at maturity, end walls absent.