Out of all other leucocytes, the neutrophils (60-65%) are most abundant and the least are basophils (0.5-1%). Platelets are cell fragments produced from megakaryocytes. During the blood clotting, the enzyme thrombin converts inactive fibrinogens into active fibrins.. 

Hb contains a protein portion called globin and a pigment portion called haem. The haem portion consists of four atoms of iron, each capable of combining with a molecule of $O _{2}$. Thus, one Hb carries 4 molecules of $O _{2}$.

Nearly 20-25% of $CO _{2}$ is transported by RBCs whereas 70% of it is carried as bicarbonate in plasma. About 7% of $CO _{2}$ is carried in a dissolved state through plasma. About 97% of $O _{2}$ is carried by RBCs in the blood. About 3% of $O _{2}$ Is transported in a dissolved state through the plasma.

The sieve tubes are supporting cells in the conducting tissue of the plant and are characterised by the absence of a nucleus. 

Hemoglobin (Hb or Hgb ) is an iron-containing protein present in Erythrocytes or Red blood cells (RBC) of almost all vertebrates. Each hemoglobin is made up of 4 subunits, 2 alpha subunits, and 2 beta subunits. Each subunit surrounds the central heme group that contains iron and binds to one oxygen molecule. It carries oxygen from lungs to tissues. It also helps in the transportation of carbon dioxide, hydrogen ions back to the lungs from the tissues. Hence RBC helps in transportation of gases while WBC takes parts in immune function and protects the body from infectious diseases and foreign invaders(bacteria, viruses other pathogens) and platelets in blood coagulation.

Platelets are cell fragments produced from megakaryocytes (special cells in the bone marrow). They are also called as thrombocytes. An injury or a trauma stimulates the platelets in the blood to release certain factors which activate the mechanism of coagulation or blood clotting. They also change their shape from round to spiny and stick to the broken vessel wall and each other and forms net-like structure during bleeding. This prevents the loss of hemoglobin through bleeding.

Heat Shock is given to bacteria for transformation that alters the membrane fluidity. The increase in temperature creates pores in the bacterial plasma membrane and allow plasmid DNA to enter the bacterial DNA. For the heat shock, the DNA-bacteria mixture is put into a 42C to 37C water bath. 

The process of making blood cells is called haemopoiesis. Blood cells are made in the bone marrow. That's a spongy tissue located inside some bones. It contains young parent cells called stem cells. These blood-forming stem cells can grow into all 3 types of blood cells – red cells, white cells, and platelets. These blood-forming stem cells make copies of themselves, and they also produce mature blood cells. When blood cells are fully mature and functional, they leave the bone marrow and enter the blood. Healthy people have enough stem cells to keep making all the blood cells they need every day.

Human Saliva -6.8
Human Blood -7.4
Gastric Juice-1.8
Urine-6

Blood platelets or thrombocyte is another word for platelet, the blood cell that is responsible for normal blood clotting. The root "thrombo" means clot, and you will see it used with diseases and conditions that affect the platelets and blood clotting.

Red blood cells-- also known as RBCs, red cells, red blood corpuscles, haematids, erythroid cells or erythrocytes (from Greek erythros for "red" and kytos for "hollow vessel", with -cyte translated as "cell" in modern usage), are the most common type of blood cell and the vertebrate's principal means of delivering.

Diameter of capillaries is 4u for RBC to pass. As RBC has diameter of 8u it experiences large deformations while passing.

Platelets are cell fragments produced from megakaryocytes (special cells in the bone marrow). They are also called as thrombocytes. An injury or a trauma stimulates the platelets in the blood to release certain factors which activate the mechanism of coagulation or blood clotting. They also change their shape from round to spiny and stick to the broken vessel wall and each other and forms net-like structure during bleeding. Hence platelets forms net-like structure during bleeding.

Hemoglobin (Hb or Hgb ) is an iron-containing protein present in erythrocytes or Red blood cells(RBC) of almost all vertebrates. Each hemoglobin is made up of 4 subunits, 2 alpha subunits and 2 beta subunits. Each subunit surrounds the central heme group that contains iron and binds to one oxygen molecule. Hence each hemoglobin molecule can bind to four oxygen molecules. It carries oxygen from lungs to tissues. It also helps in the transportation of carbon dioxide, hydrogen ions back to the lungs from the tissues. Hence haemoglobin in the RBCs helps in the transport of oxygen and carbon dioxide.

(b) To maintain electrostatic neutrality of plasma, many chloride ions diffuse from plasma into RBCs and bicarbonate ions pass out. The chloride content of RBCs increase when oxygenated blood become deoxygenated. This is termed as chloride shift or Hamburger phenomenon.

(d) One molecule of the haemoglobin has 4 haem groups and each of them is capable of taking up one molecule of $O _2$ .

The presence of haemoglobin, the red pigment in the red blood cells (RBCs) makes blood appear red in colour. The haemoglobin carries oxygen and transports it to all the parts of the body.

Chloroplasts are very similar to mitochondria but are found only in the cells of plants and some algae.ATP synthesis is present in both Mitochondria and Chloroplast and the outer membrane has not more surface in both.

WBC count of lymph is 500 $mm^3$. Therefore answer should be actually (C). The genetic material is absent.