Science M.C.Q. [1 M]

Collenchymatous tissues are mechanical tissues in the plants and are characterized by deposition of cellulose at the corners of the cell, which leads to localized thickenings of the cell wall.

Muscles help in movement and therefore contains contractile proteins.

Collenchyma has no role in transport of water. Parenchyma is a supportive tissue and has nothing to do with conduction of water. The xylem vessels also known as xylem tracheae are the most active water conducting elements.

Nucleus is located at the periphery in striated muscles.

It is because of the intercalary meristem which is found at the base of the nodes of the sugarcane which divides to form long stems of the sugarcane.

Cardiac muscle fibres are branched, striated and uninucleate. These muscles are involuntary. These muscles are exclusively present in the heart and show rhythmic contraction and relaxation throughout life.

Haversian canals are a series of microscopic tubes in the outermost region of bone called cortical bone that allows blood vessels and nerves to travel through them.
They are absent in muscles,nerves and cartilage.

Conduction of water is a function of the xylem tissues and not of epidermis.

Meristematic tissue consists of cells which are not differentiated and which are cabable of cell division. It is found on those regions of the plant which grows.

Platelets are not true cells in the blood.

The meristem which occurs at the growing tips of roots and shoots and increases the length of the stem and root is called apical meristem.

Longitudinal growth in stem takes place at the top. So, portion below the apical meristem will remain at a constant level even after growth.

The mineral constituent of bone is composed of a salt of calcium and phosphorus called calcium phosphate.
This makes the bony framework hard and strong.

Parenchyma which contains chlorophyll and takes part in photosynthesis, is called chlorenchyma.

The cell wall of meristematic cell is thin and made up of cellulose.

The grit of pear is formed of stone cells also known as sclereids.

Each stomata is surrounded by a pair of guard cells. Guard cells regulate the opening and closing of stomata.

Trabeculae refers to the projections from the cell wall that extends across the cavity of certain plants.
The endodermal cells elongate to form trabeculae and they help in connecting the two tissues.

Pholem is mainly responsible for the conduction or transport of organic food prepared by the plant.

If the tip of sugarcane plant is removed the apical meristem is also removed as it is situated in the apices of growing roots and stem.
Intercalary meristem are located at the base of leaves or nodes and leads to the increase in the length of an organ such as leaves and internodes.

Mast cells are found in areolar tissue, basophils are found in blood and osteocytes are found in bone.