An extensive network of blood vessels is present in the wall of the alveoli. The Solution is very helpful for the students who want to find easier ways to solve the question. Question 1: Why does the colour of copper sulphate solution change when an iron nail is dipped in it? Answer During a single cycle blood goes twice in the heart which is known as double circulation. The walls of the alveoli are one cell thick and it contains an extensive network of blood capillaries. Chapter 7 - Control and Coordination There are total 12 questions in the chapter. Question 4: What is meant by potential difference between two points? Question 1: Why does the cord of an electric heater not glow while the heating element does? Answer Life processes such as nutrition, respiration, transportation, excretion, etc.
Since these cells are not in direct contact with surrounding environment so, simple diffusion cannot meet the oxygen requirement of all these cells. Score good marks in your science exams if you know what and how much to write. Their equivalent resistance will be the sum The third 6 Ω resistor is in parallel with 12 Ω. This system is essential in animals that have high energy need. It receives deoxygenated blood from the various body parts and sends this impure blood to the lungs for oxygenation. We have present our best experience and support and you can also contact us anytime for further help.
An osmotic pressure is formed and water and minerals are transported from one cell to the other cell due to osmosis. First four questions are of objective type. Because of transpiration, a suction pressure is created as a result of which water is forced into the xylem cells of roots. This will help students to prepare the subjects in a disciplined manner. These villi increase the surface area for more efficient food absorption.
Go back to main page or move to of page. Chapter 14 - Sources of Energy The question has total ten questions. As a result, the amount of current decreases and the device becomes hot. Further break down of pyruvate takes place in different manners in different organisms. The law of conservation of mass states that mass can neither be created nor destroyed. Question 2: Why is the amount of gas collected in one of the test tubes in Activity 1.
Answer Lungs contain millions of alveoli which provide a surface for the exchange of gases. Exchange of gases is absent. Question 3: What is meant by resistance of a conductor? Answer 2: Ammeter: An ammeter ampere + meter is a device used to measure electric current in a circuit. This creates a difference between the concentration of ions of roots and soil. The reaction is as follows: Question 4: What is a balanced chemical equation? What criteria do we use to decide whether something is alive? Answer The main components of the transport system in human beings are the heart, blood, and blood vessels. This hydrated iron oxide is rust. How is the small intestine designed to absorb digested food? Food is obtained directly or indirectly from autotrophs.
It is from positive terminal to negative terminal. However, a living organism can also have movements, which are not visible to the naked eye. Or In an electric circuit state the relationship between the direction of conventional current and the direction of flow of electrons. Answer At first glucose 6 carbon molecules is broken in the cytoplasm of cells of all organisms. In the seventh question, we have to draw a labelled diagram of the longitudinal section of a flower.
Answer 2: Both the cord and the heating element of an electric heater carry the same current. The paper is divided into two sections A and B and you need to answer the questions from one section at one place. Answer Aerobic respiration Anaerobic respiration It occurs in the presence of O 2. Answer d The given reaction is an example of a displacement reaction. It means that the total number of atoms of each element should be equal on both sides of a chemical equation.
I request the users of this website to not to use this website anymore. Answer Question 15: What do you mean by a precipitation reaction? Go back to main page or move to of page. The questions and answers which are given in provide a thorough understanding of all concepts and topics. Go back to main page or move to of page. Also the answers were given wrongly for most of the questions, especially the important questions.