Free Tree Biology Questions and Answers — Questions and Answers
Question 1: What part of the tree is responsible for transporting water from roots to leaves?
- Phloem
- Cambium
- Xylem (Correct answer)
- Cortex
Correct answer: Xylem
The xylem is a crucial vascular tissue in trees responsible for transporting water and dissolved minerals from the roots upwards to the leaves. This process, known as transpiration, is essential for photosynthesis and maintaining the tree's turgor pressure.
Question 2: Which part of the tree produces new cells for growth?
- Xylem
- Phloem
- Cambium (Correct answer)
- Pith
Correct answer: Cambium
The cambium is a thin layer of meristematic tissue located between the xylem and phloem in woody plants. It is responsible for secondary growth, producing new xylem cells (wood) inwards and new phloem cells (inner bark) outwards, leading to an increase in the tree's girth.
Question 3: What is the function of stomata in leaves?
- Absorb nutrients
- Provide structure
- Store water
- Gas exchange (Correct answer)
Correct answer: Gas exchange
Stomata are tiny pores, primarily located on the underside of leaves, that regulate the exchange of gases between the plant and the atmosphere. They allow carbon dioxide to enter for photosynthesis and oxygen and water vapor to exit during transpiration.
Question 4: Photosynthesis primarily occurs in which part of the tree?
- Roots
- Bark
- Leaves (Correct answer)
- Trunk
Correct answer: Leaves
Photosynthesis, the process by which plants convert light energy into chemical energy, primarily occurs in the leaves of a tree. Leaves contain chloroplasts, which house chlorophyll, the pigment essential for absorbing sunlight and initiating the photosynthetic reaction.
Question 5: Which tissue carries sugars produced in the leaves to other parts of the tree?
- Xylem
- Cambium
- Phloem (Correct answer)
- Sapwood
Correct answer: Phloem
The phloem is the vascular tissue responsible for transporting sugars, produced during photosynthesis in the leaves, to other parts of the tree where they are needed for growth or storage. This process is called translocation, ensuring that all living cells receive the necessary energy.
Question 6: What role does the root cap play in a tree's root system?
- Anchors the tree
- Stores nutrients
- Protects root tip (Correct answer)
- Absorbs sunlight
Correct answer: Protects root tip
The root cap is a thimble-shaped layer of cells that covers and protects the delicate growing tip of a root as it pushes through the soil. It secretes mucilage to lubricate the root's passage and shields the meristematic cells from abrasive soil particles.
Question 7: Which of the following is a function of tree bark?
- Produces seeds
- Performs photosynthesis
- Protects inner tissues (Correct answer)
- Regulates gas exchange
Correct answer: Protects inner tissues
Tree bark serves as the outermost protective layer, shielding the delicate inner tissues like the cambium, phloem, and xylem. It defends against physical damage, insect infestations, diseases, and environmental stressors such as extreme temperatures and moisture loss. This crucial protective function is vital for the tree's survival and overall health.
Question 8: What part of the root absorbs most of the water and nutrients?
- Root cap
- Tap root
- Root hairs (Correct answer)
- Lateral root
Correct answer: Root hairs
Root hairs are microscopic, hair-like extensions of epidermal cells located near the tips of tree roots. Their vast collective surface area significantly increases the efficiency of water and dissolved mineral nutrient absorption from the soil. While other root parts transport these substances, root hairs are the primary structures responsible for initial uptake.
Question 9: Which layer of a tree is primarily responsible for new annual rings?
- Heartwood
- Cambium (Correct answer)
- Bark
- Phloem
Correct answer: Cambium
The cambium is a thin, actively dividing layer of meristematic cells situated between the xylem (wood) and phloem (inner bark). It is responsible for the tree's secondary growth, producing new xylem cells inwards to form annual rings and new phloem cells outwards. This continuous cell division leads to the increase in the trunk and branch girth each year.
Free Tree Biology Questions and Answers
What part of the tree is responsible for transporting water from roots to leaves?