Question

5. Describe cellular components of blood. Also, mention their functions.
6. Explain the process of transportation of water, nutrients and food in plants.
7. Give differences between:
(a) Auricle and ventricle
(b) RBC and WBC
(c) Xylem and phloem​

Answer 1

Answer:

Composition of blood

Blood transports materials and heat around the body, and helps to protect against disease. It contains:

plasma

red blood cells

white blood cells

platelets

Plasma is a straw-coloured liquid that makes up just over half the volume of blood.

Pie chart showing blood composition: 55% is plasma, and 45% is red blood cells, white blood cells and platelets that float within the plasma.

Systemic circulation between the heart and other organs

This table explains the functions of various blood components.

Component Function(s)

Plasma Transporting carbon dioxide, digested food, urea, hormones and heat

Red blood cells Transporting oxygen

White blood cells Ingesting pathogens and producing antibodies

Platelets Involved in blood clotting

Explanation:

Answer 2

Answer:

ans 5 - It has four main components: plasma, red blood cells, white blood cells, and platelets. Blood has many different functions, including: transporting oxygen and nutrients to the lungs and tissues.

ans 6 - Xylem transports water and solutes from the roots to the leaves, while phloem transports food from the leaves to the rest of the plant. Transpiration is the process by which water evaporates from the leaves, which results in more water being drawn up from the roots.

ans 7 - (a) Explanation: The auricle is the upper chamber of the heart and the ventricle is the lower chamber of the heart. The ventricles of the heart have the thick muscular walls as compared to the auricle. The ventricles receive the blood at high pressure as compared to the auricle.

(b) Red blood cells do not have a nucleus on maturity. WBCs are characterized by the presence of a large central nucleus. Due to the presence of haemoglobin, these cells appear red in colour. These cells are colourless, as they do not have any pigment.

(c) Xylem and phloem facilitate the transportation of water, minerals and food throughout the plant. Xylem carries water and minerals from the roots to the leaves. Whereas, phloem carries the food prepared by the leaves to different parts of the plant.

Explanation:

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