Which muscles act involuntarily?
(i) Striated muscles
(ii) Smooth muscles
(iii) Cardiac muscles
(iv) Skeletal muscle
The working of both smooth and cardiac muscles is involuntary while Skeletal or striated muscles move according to our will and are voluntary in action.
The plant tissue which provides mechanical strength and consists of living cells, is
Cartilage is not found in
Cartilage is not found in kidney. As cartilage is a structural component of our body act as connective tissue which is not required in the kidney. They are flexible connective tissue mainly found in ribs, ear, nose etc.
The conducting cells of xylem are
Survival of plants in terrestrial environment has been made possible by the presence of
The conducting tissues in plants conduct different saps and have different structures. The primary conducting tissues or plants are Xylem and Phloem. Xylem conducts water from roots to other parts of the plant, whereas phloem transport food and other material from the leaves to other parts of plants.
___________ smoothens the bone surfaces at the joints.
Cartilage is the tissue that smoothes bone surfaces at joints. It is a type of connective tissue. It is an elastic tissue.It protects the joints . It is present at the joints. Nose and
Ear also has cartilage tissues.
Intestine absorbs the digested food materials. What type of epithelial cells are responsible for that?
Branched involuntary muscle fibres are found in
Skeletal muscle fibers are cylindrical, multinucleated, striated, and under voluntary control. Smooth muscle cells are spindle shaped, have a single, centrally located nucleus, and lack striations. They are called involuntary muscles. Cardiac muscle has branching fibers, one nucleus per cell, striations, and intercalated disks. Its contraction is not under voluntary control.
Find out incorrect sentence.
Chlorenchyma and aerenchyma are modified/ specialised
The dead element present in the phloem is
The substance found in the cell wall of cork or bark that makes it impervious to water is
Meristematic tissues in plants are
The mineral elements found in our bone making it hard, are
Flexibility in plants is due to
Glands in our body are formed by
Epithelial tissue gives rise to glands in the body. They line the surface of various ducts, glands and organs. This type of tissue is also known as glandular Epithethillum increase by mitosis.
Which is not a function of epidermis ?
Epidermis is present as outermost layer of plant body such as leaves, flowers, stem and root. It is covered with cuticle (a waterproof layer of waxy substance cutin) The main function of epidermis is to protect the plant from desiccation and infection. In fact, cuticle of epidermis helps to reduce water loss by evaporation from the plant surface and also helps in preventing the entry of pathogen (bacteria, fungi etc.). The aerial surface of many plant bear cutinised hair (trichomes) to reduce transpiration.
Tendons help to connect
Muscles whose contraction is under our control are
The mechanical strength and rigidity of cell wall is due to
Lignin is the complex polymeric molecule composed of Phenylpropanoid units associated with cellulose ( as Lignocellulose) in cell walls of Sclerenchyma, Xylem vessels are tracheids, making them strong and rigid. After cellulose, lignin is the most abundant plant polymer, forming 20-30% of the wood of the trees.