Secondary Growth in Plants MCQs

u930973931_answers

4 months ago

What is secondary growth in plants primarily responsible for?
- A) Increase in stem and root thickness
- B) Increase in plant height
- C) Photosynthesis
- D) Flower production
Which meristem is primarily involved in secondary growth?
- A) Apical meristem
- B) Intercalary meristem
- C) Lateral meristem
- D) Primary meristem
What are the two main types of lateral meristems?
- A) Apical and intercalary
- B) Vascular cambium and cork cambium
- C) Primary and secondary
- D) Epidermal and ground
What tissue is produced by the vascular cambium?
- A) Phloem only
- B) Both xylem and phloem
- C) Cortex
- D) Pith
Which type of growth occurs in the vascular cambium?
- A) Secondary growth
- B) Primary growth
- C) Apical growth
- D) Intercalary growth
What is the main function of the cork cambium?
- A) Produce protective cork tissue
- B) Conduct water
- C) Transport nutrients
- D) Store food
What is the protective layer formed by cork cells called?
- A) Phellem
- B) Cork
- C) Pith
- D) Cambium
Which type of tissue is produced during secondary growth to strengthen the plant?
- A) Sclerenchyma
- B) Parenchyma
- C) Collenchyma
- D) Epidermis
In which type of plants does secondary growth occur?
- A) Dicots and gymnosperms
- B) Monocots only
- C) All plants
- D) Ferns only
What is the term for the annual growth rings found in trees?
- A) Growth increments
- B) Cambial rings
- C) Xylem rings
- D) Phloem layers
Which tissue is responsible for the transport of water and minerals in secondary growth?
- A) Secondary xylem
- B) Phloem
- C) Cork
- D) Cortex
What happens to the primary xylem during secondary growth?
- A) It disappears completely.
- B) It becomes part of the secondary xylem.
- C) It continues to grow indefinitely.
- D) It is replaced by phloem.
What is the outermost layer of the stem formed during secondary growth called?
- A) Periderm
- B) Epidermis
- C) Cork cambium
- D) Cortex
Which of the following is NOT a function of secondary growth?
- A) Increasing height of the plant
- B) Increasing stem diameter
- C) Strengthening the stem
- D) Storing nutrients
In what order does secondary growth occur in woody plants?
- A) Cork cambium, secondary phloem, secondary xylem
- B) Secondary xylem, cork cambium, secondary phloem
- C) Primary phloem, secondary phloem, secondary xylem
- D) Vascular cambium, cork cambium, pith
What type of cells make up the cork tissue?
- A) Dead cells
- B) Living cells
- C) Parenchyma cells
- D) Collenchyma cells
Which hormone is primarily involved in the regulation of secondary growth?
- A) Cytokinin
- B) Auxin
- C) Gibberellin
- D) Ethylene
How does secondary growth affect the overall structure of a plant?
- A) It reduces plant height.
- B) It increases stability and support.
- C) It limits the plant’s ability to transport nutrients.
- D) It prevents the plant from producing flowers.
Which tissue is typically found in the center of a stem in secondary growth?
- A) Pith
- B) Cortex
- C) Epidermis
- D) Phloem
What happens to the vascular cambium as secondary growth progresses?
- A) It continues to divide and add new cells.
- B) It becomes inactive.
- C) It turns into cork cambium.
- D) It replaces primary meristems.
What type of growth do most monocots exhibit?
- A) Secondary growth
- B) Primary growth only
- C) Both primary and secondary growth
- D) None of the above
Which of the following structures is NOT involved in secondary growth?
- A) Vascular cambium
- B) Cork cambium
- C) Apical meristem
- D) Secondary xylem
Which of the following best describes the structure of secondary xylem?
- A) Thin-walled cells
- B) Thick-walled cells with lignin
- C) Living cells
- D) Parenchyma cells
What happens to the stomata in stems undergoing secondary growth?
- A) They become larger.
- B) They may become sunken or covered by cork.
- C) They increase in number.
- D) They disappear completely.
Which of the following can be a product of secondary growth in plants?
- A) Leaves
- B) Wood
- C) Flowers
- D) Seeds
Which type of growth is primarily responsible for the thickening of roots?
- A) Primary growth
- B) Secondary growth
- C) Apical growth
- D) Intercalary growth
What substance strengthens the walls of sclerenchyma cells in secondary growth?
- A) Cellulose
- B) Lignin
- C) Pectin
- D) Hemicellulose
How does cork cambium contribute to secondary growth?
- A) It produces cork cells for protection.
- B) It transports nutrients.
- C) It conducts water.
- D) It stores carbohydrates.
What happens to the primary cortex during secondary growth?
- A) It is completely removed.
- B) It is often replaced or pushed outward.
- C) It becomes thicker.
- D) It turns into phloem.
In a cross-section of a woody stem, which layer is found just inside the bark?
- A) Cork cambium
- B) Pith
- C) Primary phloem
- D) Secondary xylem