FREE NEET Botany Questions and Answers
The _____ is the sole live component of the xylem tissue.
"Xylem tissue is a complex vascular tissue responsible for the transport of water, minerals, and some organic compounds in vascular plants. It consists of several cell types, including tracheids, vessels, xylem parenchyma, and xylem fibers. While tracheids, vessels, and xylem fibers are specialized cells within the xylem tissue, they are non-living at maturity. Tracheids and vessels are responsible for water transport, whereas xylem fibers provide mechanical support. Xylem parenchyma, on the other hand, is the only component of the xylem tissue that remains alive and metabolically active. It plays a role in various functions, such as storage, metabolism, and lateral transport within the xylem tissue.Therefore, among the given options, xylem parenchyma is the sole live component of the xylem tissue."
Which of the following vessels is the most sophisticated water-conducting component?
Multiple vessels, also known as vessel members, are formed by the fusion of several individual vessel cells. They create a continuous and interconnected pathway for water movement within the xylem tissue. This interconnected network of multiple vessels allows for efficient water transport, with fewer obstacles and interruptions compared to simple vessels.
The growth of wood parenchyma results from .
"The development of wood parenchyma can occur from ""ray initials,"" ""collenchyma cells,"" and ""fusiform initials."" Wood parenchyma cells are a type of living plant tissue found in the xylem of woody plants. They serve various functions such as storage, transportation, and support. The development of wood parenchyma involves the contribution of different cell types."
Which of the following tissues participates in the conduction of water?
"Xylem and phloem are the two types of vascular tissues involved in the conduction of water and nutrients in plants. Xylem tissue is responsible for the transport of water and minerals from the roots to the rest of the plant. It consists of various cell types, including tracheids, vessels (in angiosperms), xylem fibers, and xylem parenchyma. Tracheids and vessels are specialized cells within the xylem that primarily carry out water conduction. Phloem tissue, on the other hand, is responsible for the transport of organic molecules, such as sugars, from the leaves to other parts of the plant. Phloem consists of sieve tube elements, companion cells, phloem fibers, and phloem parenchyma. Therefore, the tissue involved in water conduction is ""Xylem."" Phloem, on the other hand, is responsible for the conduction of organic nutrients."
Which plant species do not have xylem vessels?
"Pinus is a type of gymnosperm, specifically a coniferous tree, and is known for its unique xylem structure. Instead of vessels, conifers like Pinus have tracheids as their main water-conducting cells in the xylem tissue. Tracheids are long, narrow cells with tapered ends that play a crucial role in water transport and provide mechanical support. On the other hand, Gnetum, mango tree, and rose are angiosperms, which are flowering plants. Angiosperms typically have both tracheids and vessels in their xylem tissue. Vessels are more specialized water-conducting cells that allow for more efficient water transport compared to tracheids. So, among the given plant species, Pinus (pine tree) is the one that does not have xylem vessels."
Which of the following does not describe a xylem parenchyma characteristic?
"The cell wall is thick, made of chitin" is not accurate for xylem parenchyma. Chitin is a structural polysaccharide found in the cell walls of fungi and the exoskeletons of arthropods. Xylem parenchyma cell walls are composed of cellulose and other polysaccharides but not chitin.
Living tissue with thin walls, isodiametric cell shapes, and intercellular gaps is referred to as .
Parenchyma is a type of simple plant tissue consisting of relatively undifferentiated cells. These cells are typically thin-walled and have a variety of shapes, including isodiametric (similar width and height) cells. The cell walls of parenchyma cells are flexible, allowing for various functions such as storage, photosynthesis, gas exchange, and wound healing.
Woodiness in plant tissues is caused by a process called .
Lignification is the process by which lignin, a complex polymer, is deposited in the cell walls of certain plant cells, leading to the development of wood-like characteristics. Lignin is a substance that provides rigidity, strength, and durability to plant tissues.
Hydroponic cultures were created by a scientist who used nutrient culture solution.
Wilhelm Knop, a German botanist, is credited with pioneering the development of hydroponic techniques in the mid-19th century. He conducted experiments and research on plant nutrition and growth, particularly focusing on the cultivation of plants without soil.In the 1860s, Knop designed nutrient solutions that contained the essential mineral elements necessary for plant growth. These solutions allowed plants to grow and thrive in a soilless environment, providing the necessary nutrients directly to the plant roots. Knop's work laid the foundation for modern hydroponic systems and significantly contributed to our understanding of plant nutrition and the ability to grow plants without traditional soil-based methods.Therefore, the scientist who used a nutrient culture solution in hydroponic cultures was Wilhelm Knop.
The component of xylem is .
"The xylem tissue in vascular plants consists of various cell types that work together to transport water, minerals, and provide structural support. The correct components of xylem are: Tracheids: These elongated, tube-like cells are one of the main water-conducting elements in xylem. They have tapered ends and thin secondary cell walls with pits that allow for lateral water movement. Vessels (or vessel elements): Vessels are specialized water-conducting cells that are larger and more efficient than tracheids. They are formed by the end-to-end fusion of vessel elements, creating long, continuous channels for water transport. Fibers: Xylem fibers are elongated cells that provide mechanical support to the plant. They have thick secondary cell walls containing lignin, which makes them strong and rigid. Parenchyma cells are also present in xylem tissue, but they are not a specific component of the xylem. Parenchyma cells in xylem tissue, known as xylem parenchyma, have various functions such as storage, metabolism, and lateral transport within the xylem. Companion cells and sieve cells are associated with phloem tissue, not xylem tissue. They are involved in the transport of organic compounds such as sugars in the plant. Therefore, the correct components of xylem are tracheids, vessels, and fibers."
Which of these plants might not be suitable for hydroponic cultivation?
"Hydroponic cultivation is a method of growing plants without soil, where plants receive essential nutrients through a nutrient-rich water solution. While many plants can be successfully grown hydroponically, some may be more challenging due to specific growth requirements or root structures. Carrots, in particular, have a taproot system where the primary root grows deep into the ground, seeking nutrients and water. This taproot structure can be difficult to accommodate in a hydroponic system that typically utilizes shallow containers or growing channels."
In hydroponics, a plant's roots are immersed in a solution of dispersed Nutrients.
These mineral nutrients are typically provided in the form of dissolved salts, hence the term "nutrient salts" or "mineral salts." The salts are dissolved in water to create a nutrient solution that is carefully balanced to meet the specific needs of the plants being grown. The concentrations of the nutrient salts can be adjusted and monitored to ensure the plants receive the appropriate amount of nutrients for healthy growth.Therefore, in hydroponics, a plant's roots are immersed in a solution of dispersed "nutrient salts" or "mineral salts" that provide the essential nutrients required for plant growth.
Which of the following statements regarding hydroponics is false?
While hydroponic systems can involve initial setup costs, it is not necessarily true that hydroponics requires a high investment. The cost of setting up a hydroponic system can vary depending on the scale, complexity, and materials used. There are various types of hydroponic systems, ranging from simple DIY setups to more sophisticated commercial systems.In fact, hydroponics can sometimes be a cost-effective method of cultivation, particularly in certain situations. For example, hydroponic systems can save water compared to traditional soil-based agriculture, making them more efficient in water usage. Additionally, hydroponics can reduce the need for pesticides and fertilizers, leading to potential long-term cost savings.Therefore, the false statement is "Requires high investment." Hydroponics can be implemented with a range of budget options, and the investment required can be tailored to fit individual needs and resources.
______ does not have vessels or tracheids.
Equisetum, commonly known as horsetail or scouring rush, is a primitive vascular plant that lacks vessels and tracheids. Instead, Equisetum has a unique water-conducting tissue known as "hydroids" or "water-conducting cells." These specialized cells are involved in the transport of water and nutrients within the plant. On the other hand, Cycas, Gnetum, and Marsilea are vascular plants that possess vessels or tracheids. Cycas is a type of cycad, Gnetum is a genus of climbing gymnosperms, and Marsilea is a genus of ferns. These plants have specialized cells for water transport, including vessels or tracheids, within their vascular tissues. Therefore, the plant in which vessels and tracheids are absent is "Equisetum."
Which of these is not a result of a mineral nutrition deficiency?
Necrosis refers to the death of cells or tissues, typically as a result of injury, disease, or other adverse conditions. While nutrient deficiencies can have detrimental effects on plant health, they typically manifest in other symptoms such as chlorosis, etiolation, or shortening internodes rather than necrosis.In summary, mineral nutrition deficiencies can cause symptoms such as chlorosis, etiolation, and shortening internodes. However, necrosis is not typically associated with mineral nutrition deficiency and is more commonly associated with other factors such as diseases, physical damage, or extreme environmental conditions.
In hydroponic plants, salts and water are absorbed by
The roots of hydroponic plants are submerged or come into contact with the nutrient solution, which contains dissolved salts and water. The roots have specialized structures, such as root hairs and root cell membranes, that facilitate the uptake of water and dissolved nutrients from the surrounding solution.As the plant roots are immersed in or in close proximity to the nutrient solution, they passively or actively absorb water and the dissolved mineral salts present in the solution. The process of absorption occurs through osmosis and other transport mechanisms, allowing the roots to take up the necessary nutrients for plant growth.While some limited absorption of water and nutrients may occur through other plant tissues such as stems and leaves, the primary site of nutrient and water uptake in hydroponic systems is the roots. The root system is specifically adapted for efficient absorption and transport of water and nutrients to the rest of the plant.Therefore, in hydroponic plants, salts and water are predominantly absorbed by the roots.