FREE Certified Arborist Tree Biology Questions and Answers

Question 1

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

Accepted Answer

fungi

Answer

Mycorrhizae refers to a symbiotic relationship between the roots of trees and fungi. The fungi extend the root system's reach, enhancing the tree's ability to absorb water and nutrients, especially phosphorus. In return, the tree provides the fungi with carbohydrates produced through photosynthesis, making it a mutually beneficial association vital for tree health.

Question 2

What is a highly fertile region around growing roots?

Accepted Answer

Rhizosphere

Answer

The rhizosphere is the narrow region of soil directly surrounding plant roots, significantly influenced by root exudates and associated microorganisms. This zone is highly active biologically, with intense nutrient cycling and microbial interactions. Its rich microbial community and nutrient availability make it a highly fertile region crucial for plant growth.

Question 3

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

Accepted Answer

Carbon

Answer

Carbon, primarily in the form of carbon dioxide (CO2), is a major greenhouse gas in the atmosphere. When present in excess amounts, it traps heat radiated from Earth's surface, preventing it from escaping into space. This phenomenon leads to a warming of the planet, known as the greenhouse effect, and is a significant contributor to climate change.

Question 4

What term describes a close collection of multiple palm flowers?

Accepted Answer

Inflorescence

Answer

An inflorescence is a group or cluster of flowers arranged on a stem, which can be a main branch or a complex arrangement of branches. For palms, flowers are typically borne in large, often branched, structures called inflorescences. This term specifically describes the entire flowering structure containing multiple individual flowers.

Question 5

What is a turgid leaf?

Accepted Answer

Fully Hydrated

Answer

A turgid leaf is one that is firm and rigid because its cells are fully hydrated. Water fills the plant cells, creating turgor pressure that pushes the cell membrane against the cell wall. This pressure helps maintain the leaf's shape, supports the plant, and indicates healthy water status, preventing wilting.

Certified Arborist Test Practice Test

Certified Arborist Test Practice Test

FREE Certified Arborist Tree Biology Questions and Answers