FREE Certified Arborist Tree Biology Questions and Answers

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What is a highly fertile region around growing roots?

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Explanation:
The rhizosphere is the highly fertile area that immediately surrounds roots that are growing. Growing roots contribute to the establishment of favorable conditions for the growth of beneficial bacteria. To be more precise, the roots shed their outer coverings and produce substances that the microbes can eat. Remarkably, the rhizosphere's chemical composition frequently differs significantly from that of the soil just next to it. For example, the pH of the rhizosphere might differ from the surrounding soil by up to two units.

When a leaf exhibits chlorosis, it is deficient in:

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Explanation:
A leaf lacking in chlorophyll is said to exhibit chlorosis. Plants get their green hue from chlorophyll, which is also an essential component of photosynthesis. Insufficient nutrients can cause a plant's green sections to turn yellow or white. Malnutrition or illness frequently causes low levels of chlorophyll.

What is the gradual process by which a tree adapts to changes in its surroundings?

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Explanation:
Acclimatization is the gradual process by which a tree adjusts to changes in its surroundings. Any tree must adapt if it is to survive in environments other than its native one. Conversely, aggregation refers to the collection of particles, such as soil particles. The process by which the outermost plant tissue adapts to a new, frequently colder environment is known as "hardening off" in arboriculture.

What distinguishes simple leaves from compound leaves?

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Explanation:
Simple leaves only have one leaf blade, whereas compound leaves might have multiple leaflets. Simple and compound leaves are found in many different kinds. Simple leaves can have both serrations and lobes. A complex leaf can have leaflets that grow from many petioles or from a group of leaflets that grow from the same stem.

What factor in the atmosphere leads to the greenhouse effect when present in excess amounts?

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Explanation:
The atmosphere's excess amounts of carbon dioxide are what causes the greenhouse effect. Through a process known as carbon sequestration, trees, and other plants can combat this issue. Tree tissue absorbs carbon dioxide, which stays there until the tree rots and disintegrates. One significant component of the carbon cycle is represented by trees.

What is a turgid leaf?

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Explanation:
A turgid leaf is fully hydrated and even in the warmest season of the year, if the tree is healthy, the leaves should always be turgid in the early morning. On the other hand, the leaves of the tree could start to curl up or turn slightly yellow if it is very dry.

Although they are made in the ____, cytokinins are crucial for the growth of the ____.

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Explanation:
Although they are produced in the roots, cytokinins are essential for the growth of the shoots. In many ways, these hormones are the opposite of auxin, which is produced in the shoots yet is crucial for the growth of roots. In the shoots, cytokinins promote cell division.

Mycorrhizae refers to the beneficial relationships between the roots of trees and ________.

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Explanation:
The beneficial associations between fungi and tree roots are known as mycorrhizae. Symbiosis is the term for this kind of beneficial relationship between two parties. According to whether the fungus resides inside or outside the root, mycorrhizae can be either ectotrophic or endotrophic. Mycorrhizae are beneficial to trees because they expand the area available for the absorption of nutrients, particularly phosphorus. By taking up carbohydrates from the plant tissues, fungi gain an advantage.

What term describes a close collection of multiple palm flowers?

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Explanation:
An inflorescence is a close collection of many palm flowers. Certain palm trees have inflorescences that include a huge number of small flowers, indicating that the tree will bear a lot of fruit. A palm leaf is called a frond. Large leaves with a segmented shape are found on fronds. Monocots are a class of plants that lack cambium and growth rings. Palms are included in this group. A monocot's circulatory system is dispersed throughout the stem and shielded by dense wood fiber and parenchymal cells. The base of a leaf stalk is called a petiole.

Which arrangement, with a petiolule for each leaflet, places the leaflets of a compound leaf along a single stem?

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Explanation:
When a compound leaf is arranged pinnately, each leaflet has its own petiole and is arranged along a single stem. With symmetrical features arranged around a central spine, pinnate leaves resemble feathers in appearance. The majority of pinnate leaves are complex, consisting of several leaflets. A bipinnate leaf is made up of many pinnate leaves that branch off of a second central axis, making it double split. A palmate leaf has three or more nerves, leaflets, or lobes originating from a common point.

In a pine fascicle sheath, how many needles are uncommon?

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Explanation:
Four needles are not typically seen in a pine fascicle sheath. A compact cluster or bundle of needles is called a pine fascicle sheath. The sheath is made up of scales from the buds.

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