NARAYANKAR NOTES

Here are 20 sentences in different tenses, mixed randomly: 1. She is reading a novel in her room. 2. We visited the museum yesterday. 3. He will complete his homework tonight. 4. They have finished their project. 5. I wake up at six every morning. 6. She was cooking dinner when I called her. 7. Rahul has been studying for three hours. 8. The train will have arrived by 8 p.m. 9. We were playing cricket in the playground. 10. My father bought a new car last month. 11. I will be attending the meeting tomorrow. 12. She had completed the work before the teacher arrived. 13. Birds fly in the sky. 14. They will visit Delhi next week. 15. He has written three letters today. 16. I had been waiting for the bus for an hour. 17. The children are playing in the garden. 18. She will have been working here for five years by December. 19. We have been living in this city since 2020. 20. He had left the school before it started raining.

Endocrine Part of Pancreas The pancreas contains an endocrine part made up of small groups of cells called Islets of Langerhans. These islets are located between the pancreatic acini. The Islets of Langerhans mainly contain three types of cells: Cell Hormone secreted Main function α (Alpha) cells Glucagon Increases blood glucose level β (Beta) cells Insulin Decreases blood glucose level δ (Delta) cells Somatostatin Inhibits secretion of insulin and glucagon How insulin and glucagon work When blood glucose increases → β-cells release insulin → blood glucose decreases. When blood glucose decreases → α-cells release glucagon → blood glucose increases. Therefore, insulin and glucagon work together to maintain a normal blood-sugar level. Easy way to remember A-B-D → G-I-S Alpha → Glucagon → Glucose Goes UP ↑ Beta → Insulin → Glucose Goes DOWN ↓ Delta → Somatostatin → Stops/inhibits both ⭐ HSC Important Point: Pancreas is a heterocrine (mixed) gland because it has both exocrine acini and end...

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Liver The liver is one of the most important organs of our digestive system. It performs many functions related to digestion, storage of nutrients, removal of harmful substances, formation of urea, and production of important blood proteins. 1. Location, colour and size of the liver The liver is a dark reddish-brown coloured gland. It is located just below the diaphragm, mainly in the right upper portion of the abdominal cavity. The diaphragm is the dome-shaped muscular sheet that separates the chest cavity (thoracic cavity) from the abdominal cavity. The liver is the largest gland in the human body. In an adult, it weighs approximately 1.2–1.5 kg. Remember: Liver = Largest gland of the human body. --- 2. Lobes of the liver The liver is described here as a bilobed gland, meaning it has two main lobes. Bi = two Lobed = having lobes Therefore, bilobed = having two lobes. Each lobe is covered by a thin protective covering known as Glisson's capsule. Glisson's capsule Glisson's...

  Chapter 13: Organisms and Populations —  This chapter explains how organisms live in their surroundings, how they adjust to environmental conditions, how populations grow, and how different species interact with one another . 1. Ecology The natural world contains a huge variety of living organisms. To understand this living world, scientists study different levels of organization : Macromolecules → Cells → Tissues → Organs → Organism → Population → Community → Ecosystem → Biome What is Ecology? Ecology is the study of: interactions between organisms, and interactions between organisms and their physical or abiotic environment . The term ecology was first used by Reiter , while E. Haeckel gave proper meaning and importance to the concept. organisms and population tb 2. Ecological Hierarchy The chapter mainly describes four ecological levels: Organism → Population → Community → Biome Organism An individual living being. Example: One tiger, one mango tree, one human. Popu...

 Below is a one-shot HSC Board lecture for Chapter 14 – Ecosystems and Energy Flow , based on your uploaded textbook. It covers the major definitions, processes, diagrams, comparisons, and points that are most useful for board preparation. Ecosystem and energy flow tb CHAPTER 14 — ECOSYSTEMS AND ENERGY FLOW HSC BOARD ONE-SHOT LECTURE 1. Ecosystem An ecosystem is a self-regulatory and self-sustaining structural and functional unit of nature containing both biotic and abiotic components . The term ecosystem was coined by A. G. Tansley in 1935 . Think of an ecosystem as: Living organisms + non-living environment + interaction between them Examples: Pond Forest Grassland Desert River Ocean The entire biosphere can also be considered one global ecosystem . Types of ecosystems Terrestrial ecosystems Forest Grassland Desert Aquatic ecosystems Lakes Rivers Wetlands Estuaries Oceans Another classification: Natural ecosystem: self-sustainable and generally does not need regular human...