Tissues — Set 2
Biology · ऊतक · Questions 11–20 of 40
Which type of muscle tissue is found in the walls of the heart and works involuntarily?
Correct Answer: B. Cardiac muscle
Cardiac muscle is a specialized involuntary tissue found only in the heart. Its cells are branched, cylindrical, and uninucleated with faint striations. These muscles undergo rhythmic contraction and relaxation without fatigue throughout life.
Which cells in the nervous tissue are responsible for receiving and conducting impulses?
Correct Answer: B. Neurons
Neurons are the structural and functional units of the nervous system. Each neuron consists of a cell body, dendrites, and a long axon for transmitting signals. They allow the body to respond rapidly to various internal and external stimuli.
Aerenchyma, a tissue providing buoyancy to aquatic plants, is a modification of?
Correct Answer: D. Parenchyma
Aerenchyma is a type of parenchyma tissue characterized by large air cavities between the cells. These air pockets help aquatic plants float by providing buoyancy. This modification also facilitates the exchange of gases in water-submerged environments.
Which tissue forms the protective outer covering or 'skin' of the plant body?
Correct Answer: A. Epidermis
The epidermis is the outermost layer of cells that protects the entire plant surface. In desert plants, it often has a thick waxy coating called cutin to prevent water loss. It is usually a single layer of cells without any intercellular spaces.
The structural tissue that forms the framework of the human ear and nose tip is?
Correct Answer: A. Cartilage
Cartilage is a flexible connective tissue with widely spaced cells called chondrocytes. The matrix of cartilage is composed of proteins and sugars. It provides support and prevents friction at the joints of bones.
Sieve tubes and companion cells are the functional components of which plant tissue?
Correct Answer: B. Phloem
Phloem is the vascular tissue responsible for the translocation of food from leaves to other plant parts. Sieve tubes are tubular cells with perforated walls that conduct the food. Companion cells assist sieve tubes in maintaining the pressure gradient required for transport.
Which connective tissue fills the space inside organs and supports internal structures?
Correct Answer: C. Areolar tissue
Areolar tissue is a loose connective tissue found between the skin and muscles. It acts as a filler tissue and supports delicate internal organs. It also plays a vital role in repairing damaged tissues in the body.
Which type of meristem is responsible for the increase in the girth (width) of the plant?
Correct Answer: B. Lateral meristem
Lateral meristem is found on the sides of the stem and root, leading to secondary growth. It includes tissues like vascular cambium and cork cambium. This growth results in the thickening of the plant body over time.
Muscles that are attached to the skeleton and can be moved at our will are called?
Correct Answer: D. Voluntary muscles
Voluntary muscles, also known as skeletal or striated muscles, are under conscious control. They show alternate light and dark bands or striations under the microscope. These muscles are primarily responsible for body movements and posture.
Which tissue provides mechanical support to the plant and is composed of dead, elongated cells?
Correct Answer: D. Sclerenchyma
Sclerenchyma cells are dead at maturity and have heavy lignin deposition in their cell walls. This tissue is designed to withstand high pressure and provide structural integrity. It is the hardest tissue found in the plant kingdom.