Tissues Test - 54

The fibrous connective tissue that connects bones to other bones is known as ligament. Ligament possesses high elasticity and strength. It has a very little matrix. 

Lymph is clear to whitish liquid in which white blood cells, especially lymphocytes are suspended. The serum is blood plasma without blood cells (like red blood cells, white blood cells, and platelets) and blood clotting factors like fibrinogen. Vaccine provides the individual with active acquired immunity. It contains weakened or killed microbes, its toxin or one of its surface proteins. Plasma is a pale yellow colored fluid that remains after red blood cells, white blood cells and platelets are removed from the blood.  Therefore, option A is correct. 

Contraction or relaxation of the urinary bladder is not under control of the conscious will. As and when urine is formed, it is stored in the urinary bladder and its muscles are stretched. These muscles are smooth muscles and they are involuntary and unstriated.

Hence the correct option is B.

Organ is a collection of tissues combined in a structural unit to perform a common function. 
Organ system is a unit in which many organs work together to carry out one particular function. For example- cardiac cycle is carried out by heart, blood vessels and blood. 
Cell aggregate is an aggregation of cells at a particular site in a particular situation, e.g. when blood vessels being ruptured then platelets become aggregated at that site. 
A group of cells having a common origin and performing a similar function is called as tissue. 

• Areolar tissue is connective tissue.
• Areolar connective tissue holds organs in place and attaches epithelial tissue to other underlying tissues. It also serves as a reservoir of water and salts for surrounding tissues.
•  Almost all cells obtain their nutrients from and release their wastes into areolar connective tissue.

Hence, option C is correct. 

A centriole is a small set of microtubules arranged in a specific way. There are nine groups of microtubules. When two centrioles are found next to each other, they are usually at right angles. The centrioles are found in pairs and move towards the poles (opposite ends) of the nucleus when it is time for cell division. Neurons cannot divide because they lack centrioles.
Because centrioles function in cell division, the fact that neurons lack these organelles is consistent with the amitotic nature of the cell.

Haemoglobin (Hb), is a protein molecule found in red blood cells (erythrocytes). Haeme is the component of haemoglobin responsible for binding oxygen. Thus, RBC transports oxygen in the blood.

• (i) - cytoplasm; (ii) nucleus; (iii) stoma; (iv) chloroplast. 
• A stoma is a pore, found in the epidermis of leaves, stems and other organs and are used to control gaseous exchange.
•  The pore is surrounded by a pair of specialized parenchyma cells known as guard cells that are responsible for regulating the size of the opening. 
• Hence the correct option is C.