Transportation and Excretion - 2

The cup-shaped part of nephron which receives the glomerular filtrate is called Bowman’s capsule.

Waste products are stored as resins in old xylem plants. Some plant wastes are very useful to human beings, e.g. rubber, latex, gum, resins and essential oils like eucalyptus or sandalwood oil. 

Ultrafiltration takes place in glomerulus.

Sieve tubes help in the bidirectional translocation of minerals. They are elongated, food-conducting cells in phloem in angiosperms.

The purpose of making urine is to filter out waste products from the blood. Nitrogenous waste such as urea or uric acid, excess water and toxic substances are removed from blood in the kidneys. CO₂ is removed from the blood in the lungs.

Translocation of food is a function of sieve tubes. Sieve tube elements are a specialised type of elongated cells in the phloem tissue of flowering plants. The ends of these cells are connected with other sieve tube members and together they constitute the sieve tubes.

Phloem transports products of photosynthesis (sugar and food) from the leaves where they are synthesised to other parts of the plant.

Amoeba has no fixed place for removing the undigested part of food. When a considerable amount of undigested food collects inside amoeba, then its cell membrane suddenly ruptures at any place and the undigested food is thrown out of the body of amoeba.

Veins collect blood from different organs and bring it back to the heart. They do not require thick walls as found in arteries because the blood is not under pressure. However, veins have valves that ensure that the blood flows only in one direction towards the heart and thus, prevent back flow of blood.

This is the correct answer. 

In a healthy person, the diastolic blood pressure is 80 mm and systolic blood pressure is 120 mm.

In flatworms, the organs of excretion are flame cells.

The transparent yellowish fluid containing dissolved waste released from the kidney is known as urine. It is released from the kidney and passes through tubes called ureters. It is temporarily stored in the urinary bladder and is finally thrown out through a muscular tube called urethra.