Mature sclerenchyma cells are dead and primarily function to provide mechanical support and protection. They develop thick, lignified cell walls and lose their protoplasm during maturation, becoming hollow and rigid structural elements.
More Questions on Tissues in Action
1Explain how the presence of lenticels on older stems differs functionally from stomata on leaves.
→ 2A tissue section from a gland shows cells organized into clusters, with one end secreting substances and the other end attached to a basement membrane. This organization is characteristic of which tissue type?
→ 3What is the primary role of the cambium ring in dicot stems?
→ 4Which type of connective tissue contains large numbers of elastic fibres and is found in the walls of large arteries?
→ 5How does the structure of a neuron (dendrites, cell body, axon) facilitate its overall function?
→ 6Which type of muscular tissue is responsible for peristalsis in the alimentary canal?
→ 7What would be the likely consequence for a plant if its phloem sieve tube elements were to lose their companion cells?
→ 8A damaged tissue sample shows cells that are short, cuboidal, and arranged in a single layer, involved in secretion and absorption. Where would this tissue most likely be found?
→ 9Which of the following is a function of xylem fibres?
→ 10Explain why cardiac muscle cells have numerous mitochondria.
→ 11Identify the tissue that provides flexibility in areas like the tip of the nose and the outer ear.
→ 12A young plant stem grows taller. Which meristematic tissue is primarily responsible for this increase in length?
→ 13How does the stratified arrangement of cells in stratified squamous epithelium enhance its protective function?
→ 14Which animal tissue is characterized by its ability to contract and relax, bringing about movement?
→ 15Describe the role of companion cells in the function of phloem.
→ 16A person suffers a spinal cord injury, leading to paralysis. Which type of tissue's function is most directly impaired, preventing communication between the brain and muscles?
→ 17Which plant tissue is primarily responsible for storage of food and sometimes performs photosynthesis if it contains chloroplasts?
→ 18Why is blood considered a connective tissue despite its fluid nature?
→ 19In a histological slide, you observe cells that are cylindrical, unbranched, multinucleated, and show distinct striations. These cells are under voluntary control. Which type of muscle tissue is this?
→ 20Consider a plant exposed to a pathogen that specifically destroys its cork tissue. What would be the most immediate and significant consequence for the plant?
→ 21Which animal tissue forms glands that secrete substances like hormones or enzymes?
→ 22Why is the inner lining of the small intestine characterized by columnar epithelium with microvilli?
→ 23Which of the following is not a component of phloem tissue?
→ 24Explain the functional difference between a tendon and a ligament.
→ 25A biopsy reveals a tissue with a gelatinous, flexible matrix and chondrocytes embedded within it, found in the nose and ear. What tissue type is this?
→ 26Identify the plant tissue responsible for buoyancy in aquatic plants.
→ 27How does the presence of a nerve cell's long axon facilitate its function in the body?
→ 28Which type of connective tissue provides cushioning, insulation, and stores energy in the form of fat droplets?
→ 29What is the significance of the presence of nodes in monocot stems concerning intercalary meristems?
→ 30A plant's stem is unable to provide adequate mechanical support, causing it to droop, even though it is well-hydrated. Which simple permanent tissue is most likely deficient or poorly developed?
→ 31Which component of blood is primarily responsible for oxygen transport?
→ 32A person experiences pain and swelling in a joint after twisting their ankle. If a doctor suspects damage to the elastic tissue that connects bones, which specific tissue is under suspicion?
→ 33Which type of epithelial tissue is best suited for diffusion and filtration, often found lining blood vessels and air sacs of the lungs?
→ 34How do the gaps in the epidermal layer called stomata facilitate both photosynthesis and transpiration?
→ 35A laboratory experiment involves observing a cross-section of a stem. Cells are found arranged in a ring, leading to an increase in the stem's diameter. Which meristematic tissue is responsible for this growth?
→ 36Which of the following is an example of an involuntary muscle?
→ 37During autumn, leaves of deciduous trees change color and eventually fall off. Which plant tissue facilitates the separation of leaves from the stem?
→ 38Why is bone considered a specialized connective tissue, despite its hard and rigid nature?
→ 39Compare the primary function of phloem parenchyma with that of xylem parenchyma.
→ 40A patient is diagnosed with a condition affecting the tissue that transmits electrical signals rapidly throughout the body, coordinating responses to stimuli. Which tissue is primarily impaired?
→ 41Explain why sclerenchyma tissue provides hardness and stiffness to plants.
→ 42If the intercellular matrix of a connective tissue is largely fluid, rich in proteins, and contains cells like erythrocytes and leukocytes, which tissue is being described?
→ 43Which type of muscular tissue is characterized by involuntary control, striations, and branched fibers, and is essential for circulating blood?
→ 44How does the presence of a thick cuticle on the epidermis of desert plants contribute to their survival?
→ 45An accident results in a severe injury to the knee, specifically affecting the tissue that connects the thigh bone to the shin bone. What type of tissue is most likely damaged?
→ 46Which of the following scenarios best demonstrates the function of adipose tissue?
→ 47A potted plant is watered regularly, but its leaves start wilting rapidly under direct sunlight. Upon inspection, the stem appears intact. What is the most probable tissue affected, causing this rapid wilting?
→ 48Why are meristematic cells typically small, have dense cytoplasm, prominent nuclei, and lack vacuoles?
→ 49A tissue sample from an animal shows cells that are closely packed, form a continuous sheet, and have little intercellular material. This tissue forms the lining of organs and cavities. Which of the following is its primary function?
→ 50A student observes a plant tissue under a microscope. The cells are living, elongated, and irregularly thickened at the corners, providing flexibility but little rigidity. Which tissue is being observed?
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