Download NIOS Biology For UPSC And NEET Exam- Both In English / Hindi: Lesson 1. Origin and Evolution of Life and Introduction to Classification पाठ 1. जीवन कि उत्पत्ति एवं विकास और वर्गिकरण से परिचय Lesson 2. The Kingdom Monera, Protoctista and Fungi पाठ 2. जगत मोनेरा, व फंजाई Lesson 3. Kingdom Plantae and Animalia
Mechanism or Working of Heart: The work of the heart is to receive the blood and then pump it out of the heart with great force. In order to do this function heart keeps on relaxing and contracting throughout the life of a person. The contraction of the heart is known as Systole and relaxation
Lymphatic System: It is an accessory system of fluid circulation in which tissue fluid collected from interstitial spaces is passed into the blood. It consists of lymph, lymph capillaries, lymph vessels and lymph nodes. Lymph: The lymph is colourless mobile fluid connective tissue. It consists of two parts i.e. a fluid matrix the plasma and
Respiratory organs present in human being: Nasal Cavity: Nasal Cavity is a hollow structure partitioned into two nasal chambers by the nasal septum. It is composed of cartilage, bone, connective tissue and muscles. There are pairs of openings situated at the anterior and posterior ends of the nasal chambers. The anterior nostrils lead to the
What is Skeletal System? The hard parts of an animal body present inside or outside the body collectively form the skeletal system or Skeleton. Types of Skeleton: Skeleton is of two types- Exoskeleton and Endoskeleton. Exoskeleton: It is protective and supportive framework present outside the body. An exoskeleton is made up of hard structures or
What is Reproduction? Reproduction is the formation of new young ones by the grown-up individuals so as to produce a new generation or progeny. Members of the new progeny or generation are broadly similar to their parents except for size. Basic Features of Reproduction: All modes of reproduction have some common basic features. These are
Hormones Secreted by the Adrenal Cortex are the following- Mineralocorticoids: These are the steroid hormones secreted by the outermost cellular layer (zona glomerulosa) of the adrenal cortex. The fundamental mineral corticosteroid is aldosterone. Its secretion occurs when there is a fall in plasma sodium concentration or rise in plasma potassium. They control electrolyte and water
What are Neurohormones? How do these Neurohormones reach the pituitary glands? The hypothalamus is located inferior to the thalamus of the brain and it secretes neurohormones. Neurohormones are secreted by neurosecretory cells located within supraoptic and paraventricular nuclei of the hypothalamus. These hormones influence the activity of pituitary glands. These neurohormones secreted by the hypothalamus
Thyroid Gland: Origin: It is endodermal in origin and in the human embryo, it develops from the primitive foregut. Position: It is the largest endocrine gland. It lies on the ventral and lateral sides of the upper part of the trachea in the neck below the larynx. Structure: It is a brownish red, highly vascular,
What is Parthenogenesis? The term parthenogenesis was coined by Richard Owen. It is also called Virgin Birth or Apomixis. It is the special form of reproduction where an unfertilized egg is directly developed into a fully formed haploid animal. The young ones produced by this process of parthenogenesis are called parthenotes and it maintains the
