Which tissue in plants is responsible for the transport of water and minerals from roots to leaves?
Answer: A
Xylem is a vascular tissue that transports water and mineral nutrients from roots to aerial parts of the plant.
Q.2Easy
The cork tissue in plants is derived from which meristematic tissue?
Answer: C
Cork tissue (phellem) is produced outward by the cork cambium (phellogen), which is a lateral meristem.
Q.3Easy
Which of the following is a characteristic feature of monocot stems?
Answer: A
Monocot stems have scattered vascular bundles throughout the ground tissue, unlike dicots which have ring-arranged bundles.
Q.4Easy
The primary function of stomata is:
Answer: B
Stomata are pores in the leaf epidermis that regulate gas exchange (CO2 intake, O2 release) and transpiration.
Q.5Easy
Which cells regulate the opening and closing of stomata?
Answer: B
Guard cells are specialized epidermal cells that change shape to open or close the stomatal pore.
Advertisement
Q.6Easy
Which of the following cells in the phloem tissue is enucleate (lacks a nucleus)?
Answer: A
Sieve tube elements are enucleate at maturity, losing their nucleus to facilitate the flow of photosynthates. Companion cells remain nucleate and control sieve tube metabolism.
Q.7Easy
In monocot stems, the vascular bundles are arranged in a pattern that is
Answer: A
Monocot stems have scattered vascular bundles distributed throughout the ground tissue, whereas dicot stems have bundles arranged in a ring.
Q.8Easy
The endodermis in roots is characterized by the presence of
Answer: A
The endodermis contains Casparian strips—bands of suberin and lignin that prevent lateral movement of water and minerals, forcing them through the cell.
Q.9Easy
Which tissue in plants is responsible for the transport of water and minerals from roots to shoots?
Answer: B
Xylem transports water and minerals (inorganic nutrients) from roots to all parts of the plant in an upward direction.
Q.10Easy
The middle lamella in plant cell walls is primarily composed of
Answer: B
The middle lamella is composed mainly of pectin and calcium pectate, which acts as a cement holding adjacent cells together.
Q.11Easy
Which of the following tissues is responsible for the transportation of water and minerals in plants?
Answer: A
Xylem is a vascular tissue that transports water and minerals from roots to shoots through tracheids and vessels.
Q.12Easy
In a dicot stem, the arrangement of vascular bundles is:
Answer: B
Dicot stems have vascular bundles arranged in a ring or eustele pattern, whereas monocots have scattered bundles.
Q.13Easy
Companion cells are exclusively associated with which of the following?
Answer: B
Companion cells are specialized parenchymatous cells that remain alive and are attached to sieve tube elements in the phloem.
Q.14Easy
In a typical angiosperm leaf, the tissue responsible for gas exchange is primarily:
Answer: B
The spongy mesophyll contains intercellular spaces and is located below the palisade layer, facilitating gas exchange through stomata.
Q.15Easy
Which of the following is NOT a function of collenchyma?
Answer: C
Collenchyma provides mechanical support with flexibility but does not transport water and minerals; that function belongs to xylem.
Q.16Easy
Which of the following tissues is responsible for secondary growth in dicot stems?
Answer: A
Vascular cambium produces secondary xylem and phloem, while cork cambium produces cork and secondary cortex, together contributing to secondary growth.
Q.17Easy
In monocot roots, the absence of secondary growth is primarily due to:
Answer: A
Monocots lack a functional vascular cambium, which is essential for secondary growth, hence they remain herbaceous throughout life.
Q.18Easy
In xerophytic plants, which adaptation reduces the surface area for transpiration?
Answer: A
Xerophytes have a thick, waxy cuticle and stomata sunken in pits (crypts), which reduces direct exposure to air and decreases transpiration rate.
Q.19Easy
The prismatic crystals often found in vacuoles of plant cells serve primarily to:
Answer: A
Calcium oxalate crystals store excess calcium ions and help maintain osmotic balance in plant cells.
Q.20Easy
Which type of vascular bundle arrangement is characteristic of monocot stems?
Answer: A
Monocot stems have numerous scattered collateral vascular bundles distributed throughout the ground tissue, unlike the organized ring in dicots.
