Explanation: Collenchyma cells have thickened cell walls and provide flexible structural support to growing regions of plants such as stems and leaves.
- Which of the following is NOT a type of meristematic tissue?
a) Apical meristem
b) Lateral meristem
c) Intercalary meristem
d) Epidermal tissue
Answer: d) Epidermal tissue
Explanation: Epidermal tissue is not meristematic; it is a protective layer covering the outer surfaces of leaves, stems, and roots. Apical, lateral, and intercalary meristems are responsible for plant growth.
- Which type of tissue is primarily involved in the conduction of water in plants?
a) Xylem
b) Phloem
c) Parenchyma
d) Collenchyma
Answer: a) Xylem
Explanation: Xylem is the vascular tissue responsible for the conduction of water and minerals from the roots to the leaves and other parts of the plant.
- Which meristematic tissue is responsible for the elongation of shoots?
a) Apical meristem
b) Lateral meristem
c) Intercalary meristem
d) Vascular cambium
Answer: a) Apical meristem
Explanation: Apical meristems, found at the tips of shoots and roots, are responsible for primary growth, which leads to the elongation of plant organs.
- In monocot stems, vascular bundles are:
a) Scattered throughout the stem
b) Arranged in a ring
c) Present only in the center
d) Radial
Answer: a) Scattered throughout the stem
Explanation: In monocot stems, the vascular bundles are scattered throughout the ground tissue, unlike in dicots, where they are arranged in a ring.
- Which tissue gives rise to lateral roots in dicot plants?
a) Pericycle
b) Endodermis
c) Epidermis
d) Phloem
Answer: a) Pericycle
Explanation: The pericycle, located just inside the endodermis in roots, is the tissue responsible for the initiation of lateral roots in dicot plants.
- Which of the following is a feature of sclerenchyma tissue?
a) Living cells with thick walls
b) Dead cells with lignified walls
c) Thin-walled, flexible cells
d) Cells involved in food storage
Answer: b) Dead cells with lignified walls
Explanation: Sclerenchyma cells are dead at maturity, and their thick, lignified cell walls provide structural support to the plant.
- In which part of a plant would you expect to find apical meristems?
a) The center of the stem
b) The root tip and shoot tip
c) The sides of the stem
d) The nodes
Answer: b) The root tip and shoot tip
Explanation: Apical meristems are located at the tips of roots and shoots and are responsible for the primary growth of the plant, causing an increase in length.
- Which layer of cells is responsible for forming the outer bark of trees?
a) Epidermis
b) Endodermis
c) Cork cambium
d) Vascular cambium
Answer: c) Cork cambium
Explanation: The cork cambium (phellogen) produces cork (phellem) on the outer side, which forms the protective outer bark of trees.
- Which type of vascular bundle is found in monocot stems?
a) Collateral and open
b) Collateral and closed
c) Bicollateral
d) Radial
Answer: b) Collateral and closed
Explanation: In monocot stems, the vascular bundles are collateral (xylem and phloem on the same radius) and closed, meaning they lack a cambium, thus preventing secondary growth.
- Which tissue is responsible for the secondary thickening of roots and stems?
a) Epidermis
b) Apical meristem
c) Vascular cambium
d) Endodermis
Answer: c) Vascular cambium
Explanation: The vascular cambium is responsible for the secondary thickening of roots and stems through the production of secondary xylem and secondary phloem.
Leave a comment