- Which cells are responsible for the storage of food and water in plants?
a) Sclerenchyma
b) Parenchyma
c) Collenchyma
d) Tracheids
Answer: b) Parenchyma
Explanation: Parenchyma cells are living, thin-walled cells that are primarily involved in storage of food, water, and other substances, as well as in photosynthesis and wound healing.
- Which tissue is commonly found in the vascular bundles of monocot stems?
a) Open vascular bundles
b) Closed vascular bundles
c) Radial vascular bundles
d) Bicollateral vascular bundles
Answer: b) Closed vascular bundles
Explanation: In monocot stems, vascular bundles are closed, meaning they lack a cambium, thus preventing the formation of secondary xylem and phloem.
- Which of the following is NOT found in monocot roots?
a) Pith
b) Radial vascular bundles
c) Large number of xylem and phloem bundles
d) Collateral vascular bundles
Answer: d) Collateral vascular bundles
Explanation: In monocot roots, the vascular bundles are radial, not collateral. Radial bundles have xylem and phloem arranged on separate radii.
- The protective layer that forms as a result of secondary growth in dicots is called:
a) Epidermis
b) Phellem
c) Endodermis
d) Parenchyma
Answer: b) Phellem
Explanation: Phellem, also known as cork, is produced by the cork cambium and forms a protective outer layer during secondary growth.
- Which of the following is NOT a characteristic feature of xylem vessels?
a) Dead cells at maturity
b) Lignified cell walls
c) Presence of perforations
d) Presence of sieve plates
Answer: d) Presence of sieve plates
Explanation: Sieve plates are found in sieve tubes, which are part of the phloem. Xylem vessels are dead at maturity, have lignified walls, and contain perforations to allow water flow between cells.
- Which of the following tissues is involved in gas exchange in the plant stem?
a) Tracheids
b) Lenticels
c) Sclerenchyma
d) Phloem
Answer: b) Lenticels
Explanation: Lenticels are small openings in the bark of stems that allow gas exchange between the internal tissues of the stem and the outside atmosphere.
- Which part of the root absorbs water and nutrients from the soil?
a) Root cap
b) Root hairs
c) Pericycle
d) Xylem
Answer: b) Root hairs
Explanation: Root hairs are thin extensions of epidermal cells that increase the surface area of the root, allowing it to absorb more water and nutrients from the soil.
- Which of the following tissues is commonly found in dicot stems but not in monocot stems?
a) Secondary phloem
b) Epidermis
c) Parenchyma
d) Vascular cambium
Answer: d) Vascular cambium
Explanation: Dicot stems have a vascular cambium that allows for secondary growth, while monocot stems generally lack a vascular cambium, preventing secondary growth.
- The tissue that forms the wood in trees is:
a) Secondary xylem
b) Secondary phloem
c) Cork
d) Primary xylem
Answer: a) Secondary xylem
Explanation: Wood is primarily made up of secondary xylem, which is produced by the vascular cambium during secondary growth.
- Which layer of cells gives rise to the lateral roots in plants?
a) Cortex
b) Pericycle
c) Epidermis
d) Phloem
Answer: b) Pericycle
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