CBSE Questions for Class 9 Biology Tissues Quiz 9 - MCQExams.com

• The diagram shows the different types of blood cells.
• The label A refers to eosinophils. The nucleus of these cells is bilobed. They are involved in allergic and inflammatory reactions.
• The label B refers to monocytes. They have a kidney-shaped nucleus.
• The label C refers to neutrophils. They have a multilobed nucleus. the monocytes and neutrophils are involved in phagocytosis. The label D refers to lymphocyte. They have a large circular nucleus. They form the immune T cells and B cells. 

• The bone marrow produces the cellular elements of the blood, including platelets, red blood cells, and white blood cells. Red blood cells are released from bone marrow as matured RBC. 
• They lack a nucleus and other cell organelles, like mitochondria, at maturity.  
• When matured, in a healthy individual these cells live in blood circulation for about 100 to 120 days. At the end of their lifespan, they become senescent and are removed from circulation.

• A tendon is a band of connective tissue that connects muscle to bone. The tendons and muscles work together to control joint movement. It is strong and can resist stress. 
• A ligament connects a bone to another bone, usually at the joints. 
• Collagen is the fibrous protein present in our body. It is the building material of certain tissues such as tendons. 
• Cartilage is soft, gel-like padding between bones that protects joints and facilitates movement.

• The different cells in the body can regenerate in order to replace the damaged or the worn-out cells. 
• The neurons are one of the brain cells. The cells divide during the embryonal stage. After the birth of a child, the cells lose their capacity to divide. 
• These cells have the least capacity of regeneration. 
• Thus, the correct answer is option C. 

• The muscle cells which are present in the heart are called cardiac muscles. These are the modified involuntary muscles. 
• Cardiac muscles have the property of both the striated muscles and smooth muscles. 
• They are striated muscles with single nuclei. The muscle fibres are fused and intercalated discs are present.
• Cardiac muscle is highly resistant to fatigue due to the rich supply of special blood vessels. 
• Thus, cardiac muscles continuously contract and relax and regulate the functions of the heart.
• So, the correct answer is option C. 

Schwann cells are cells in the peripheral nervous system that wraps around the axons of motor and sensory neurons to form the myelin sheath.

It makes the conduction of impulses through the neuron more efficient.

• All mammals possess enucleated red blood cells whereas red blood cells of birds, reptiles, amphibians and fish all possess their nuclei. 
• Humans and camels belong to class Mammalia while frog is a amphibian.

• Adipose tissues are loose connective tissue composed mostly of adipocytes. 
• They are also known as fat-storing connective tissues. Its main role is to store energy in the form of fat. 

So, the correct answer is option C. 

• Skeletal muscle and cardiac muscle are referred to as striated muscle because it has a microscopically streaked or striped appearance. 
• Unstriped muscles are the smoot muscle as they don't show any stripes on them. 
• Smooth muscle is also known as visceral muscles as it resides in the walls of hollow organs such as the urinary bladder, the uterus, the lungs, intestines and passageways walls, such as the arteries and veins and the digestive, urinary and reproductive tract.
  
• The muscle of leg and fore limb are skeletal muscle and the muscle found in  heart are know as cardiac muscle. These are striped muscles.
• While the muscle found in the intestine is smoot muscle. 
• Hence, the correct option is A.