NCERT Long Question Answers Archives - CBSE Class Notes Online

Binary Fission in Amoeba

April 15, 2023April 23, 2023 - by Jaishree Gorane - 2 Comments.

Binary fission is the primary mode of reproduction in Amoeba, a unicellular organism. It is a simple asexual process where the parent cell divides into two identical daughter cells. In the first step the cell elongates and then the nucleus divides into two. This is followed by the division of the cytoplasm resulting in two new Amoebas. Binary fission in Amoeba is a crucial process that allows them to rapidly multiply and colonise new habitats.

Components of Xylem

March 24, 2023March 24, 2023 - by Jaishree Gorane - 8 Comments.

Xylem is a vital plant tissue responsible for the transport of water and nutrients from the roots to the leaves. It is made up of several components, including tracheids, vessel elements, fibers and parenchyma cells. Tracheids and vessel elements form long tubes that allow for efficient water transport, while fibers provide structural support. Parenchyma cells help with storage and metabolic functions.

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What’s Systolic and Diastolic Blood Pressure?

March 19, 2023April 11, 2023 - by Jaishree Gorane - 2 Comments.

Blood pressure is a vital sign that reflects the pressure of blood against the walls of arteries. Systolic blood pressure is the pressure in the arteries when the heart contracts and pumps blood out into the body, while diastolic blood pressure is the pressure in the arteries when the heart is at rest between beats. This article will provide an in-depth look at the differences between systolic and diastolic blood pressure, and why they are important .

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Heart Valves- Types, Location, Structure and Functions

March 17, 2023March 17, 2023 - by Jaishree Gorane - 3 Comments.

The human Heart has four chambers, and four valves ensure that blood flows in the correct direction. The valves are made up of thin flaps of tissue that open and close like doors. There are four main types of Heart valves – the Aortic Valve, Mitral Valve, Pulmonary Valve and Tricuspid Valve. Each valve plays a vital role in regulating blood flow in and out of the Heart. Any problems with the valves can lead to a variety of conditions that affect Heart function.

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Capillaries – Definition, Location, Structure, Types, Functions and Importance

March 16, 2023April 11, 2023 - by Jaishree Gorane - 1 Comment

Capillaries are tiny blood vessels connecting arterioles and venules, with a crucial role in exchanging glasses, nutrients and waste products. They are composed of a single layer of endothelial cells . They are classified into three types based on structure -continuous, fenestrated and sinusoidal. . Capillaries have various functions including oxygen and nutrient exchange, waste removal, regulation of blood pressure, heat exchange, immune response, hormonal regulation and disease diagnosis and treatment.

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Veins – Structure , functions ,Venous System and Circuits and Vein Valves

March 16, 2023April 11, 2023 - by Jaishree Gorane - 6 Comments.

Veins are vital blood vessels that collect oxygen-poor blood and transport it back to the heart. They are made up of three layers of tissue and fibers, and can contain one-way valves that keep blood flowing in the right direction. Veins transport oxygen-poor blood throughout the body and oxygen-rich blood from the lungs back to the heart. Veins require external forces such as breathing and muscle movement to push blood in the right direction.

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Arteries in The Body

March 14, 2023April 11, 2023 - by Jaishree Gorane - 6 Comments.

Arteries in the body are an essential component of the Circulatory System. There are two main circuits- Pulmonary and Systemic Circuit. Arteries are classified based on their size and composition. Elastic arteries, such as the aorta, are the largest and most flexible, while muscular arteries and arterioles are responsible for directing blood flow to specific areas. Major arteries, including those in the head and neck, torso, abdomen, arms and legs play vital roles in delivering oxygen and nutrients throughout the body.

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Why Do Arteries Have Thick Elastic Walls ?

March 10, 2023March 12, 2023 - by Jaishree Gorane - 5 Comments.

Arteries have thick elastic walls for several reasons like regulating blood pressure, resisting wear and tear, maintaining efficient blood flow, protecting against aneurysms and preserving structural integrity. The tunica media layer, which contains smooth muscle cells and elastic fibers, allows for contraction and relaxation to adjust the diameter of the blood vessels. The reasons for thick elastic walls in arteries are essential for the proper functioning of the circulatory system.

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How Amoeba Acquires its Food through the Process of Phagocytosis

March 2, 2023May 30, 2023 - by Jaishree Gorane - 5 Comments.

Amoeba, a single-celled organism, acquires its food through the process of phagocytosis. During this process Amoeba uses pseudopodia to engulf its prey and forms a membrane-bound phagosome which fuses with lysosomes to form a phagolysosome. The prey is then digested. Factors such as temperature, pH and food availability affect the efficiency of phagocytosis in amoeba.

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How Lymph is Formed ?

March 1, 2023April 11, 2023 - by Jaishree Gorane - 5 Comments.

The lymphatic system is responsible for maintaining proper fluid balance and immune function in the body. Lymph is formed through a complex process that involves the collection of excess fluid from the tissues, entry into lymphatic capillaries, transport through lymphatic vessels, filtration in lymph nodes and return to the bloodstream. Factors such as exercise, gravity and disease can affect lymph formation and have significant implications for overall health and wellness.