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Extra Question Chapter 1:Chemical Reaction And Equations

Extra Question II Chapter 1:Chemical Reaction And Equations

Extra Question Chapter 2:Acid Ans Base

Important Question Chapter 3:Metal and Non Metal

Chapter 4:Carbon And Its Compoundl

Chapter 5:Periodic Classification of elememt

Chapter 6:Life Processes

Chapter 7:Control and coordination

Chapter 8:How Do Organisms Reproduce?

Chapter 9:Hearedity And Evolution

Chapter 10:Light Reflection and Refraction

Chapter 11:The Human Eye and Colorful World

Chapter 12:Electricity

Chapter 13:Magnetic effect of electric current

Chapter 14:Sources of energy

Chapter 15:Our Environment

Important Questions of Life Processes

Question 1

Define life processes.

Answer

Life resources are the activities that an organism performs in order to survive and continue its species. These include nutrition, rest, travel and exclusions.

Question 2

What is the role of the stomach in digestion?

Answer

The stomach plays an important role in digestion. It releases gastric juice containing pepsin and other enzymes that help break down proteins. The stomach is also a mechanical digestive system that breaks down food into a semi-solid substance known as chyme

Question 3

How does transportation in plants occur?

Answer

Transport in plants occurs through a vascular system consisting of xylem and phloem. Specifically, the xylem carries water and metals to the rest of the plant, while the phloem transports nutrients from the leaves to other parts of the plant

Question 4

What is the significance of respiration in an organism?

Answer

Respiration is essential to living organisms because it provides oxygen needed for cellular respiration. In this process, glucose is broken down into energy, which is essential for all life processes in the organism.

Question 5

What is the role of the kidneys in excretion?

Answer

The kidneys play an important role in the elimination process. The blood is filtered and wastes such as urea and excess salts removed. This waste is then transported to the bladder where it is excreted as liquid.

Question 6

How does photosynthesis contribute to the survival of all organisms?

Answer

Photosynthesis Green plants use sunlight, carbon dioxide and water to make their food. This provides food not only for the plant itself but also for other creatures that eat the plant. In addition, photosynthesis produces oxygen, which is an essential requirement for all living things to breathe.

Question 7

Explain the process of ingestion in the human digestive system.

Answer

Food goes into the body. In humans, this process begins in the mouth where their teeth catch and chew food. The salivary glands cool food and the amylase enzyme in the saliva begins digestion by breaking down complex carbohydrates into simple sugars that then pass through the digestive tract to swallow the chewed food and to the abdominal cavity.

Question 8

What is the role of alveoli in the respiratory system?

Answer

Alveoli are tiny balloon-like structures in the lungs. They are the actual exchange point of oxygen and carbon dioxide. In the air we breathe, oxygen diffuses into the blood vessels around the veins and is carried to the cells of the body in the same way that carbon dioxide, a waste product of cellular respiration, diffuses out of the blood the root canal.

Question 9

Explain the role of enzymes in the process of digestion and mention the factors affecting their activity.

Answer

Enzymes play an important role in digestion by breaking down food into simpler components that can be easily absorbed by the body. They work by reducing the kinetic energy required to make the reaction possible, thus speeding up the process. For example, the enzyme amylase breaks down starch into maltose, while protease breaks down protein into amino acids. Enzyme activity is affected by factors such as temperature, pH level, and substrate concentration. Too high or too low temperature and pH can damage enzymes, rendering them inactive, while increasing substrate concentration increases their reactivity to a certain extent

Question 10

Describe the counter-current mechanism in the nephrons of the kidney. How does it help in the process of urine formation?

Answer

In the counter current mechanism of the nephrons of the kidney, the two limbs of the loop of the Henle filter flow in opposite directions This creates a concentration gradient that contributes to the reabsorption of water and electrolytes, thus hydration the value is greater. This mechanism is necessary to conserve water in the body

Question 11

Discuss the process of double circulation in humans and its significance.

Answer

In humans, double circulation means that blood passes through the heart twice in one complete cycle of the body. It is divided into pulmonary and systemic circulation. Oxygenated blood in the pulmonary blood is pumped from the heart to the lungs for oxygenation. Oxygenated blood in the system is pumped from the heart to different parts of the body and back to the heart. This system ensures proper separation and circulation of oxygenated and deoxygenated blood, which is essential for maintaining a stable indoor environment

Question 12

Explain the process of transpiration in plants. How does it help in the upward movement of water and minerals?

Answer

Condensation is water that travels through a plant and evaporates from leaves and other parts of the atmosphere. It provides transpiration which helps to move water and minerals up from the roots to different parts of the plant Warm water also helps with burning.

Question 13

Elaborate on the role of stomata in the process of photosynthesis.

Answer

Stomata are small openings on the leaf surface that facilitate gas exchange. In the process of photosynthesis, carbon dioxide is consumed which is used by the plant to make glucose. They also help release oxygen, which is a photosynthetic product.

Question 14

Discuss the differences between aerobic and anaerobic respiration and their energy production.

Answer

Aerobic respiration is a process that requires oxygen to break down glucose, producing carbon dioxide, water, and energy in the form of ATP. However, anaerobic respiration occurs in the absence of oxygen and produces lactic acid (in animals) or alcohol carbon dioxide (in yeast), where energy is relatively low Both are essential for the production of living organisms energy needed for various aspects of life.

Question 15

Explain the concept of osmoregulation in animals.

Answer

It is a process by which animals regulate the amount of water and salt in their bodies. It helps balance the intake and loss of water and salts, which are essential for healthy cell function.

Question 16

Describe the process of protein synthesis in cells. How does it contribute to the growth and repair of tissues?

Answer

Protein synthesis is the production of proteins by cells. It consists of two main steps: transcription, where information in DNA is transcribed into another messenger RNA (mRNA) molecule, and translation, where mRNA is used as a template to assemble amino acids into a specific protein This process important for growth and repair Occurs because proteins are the building blocks of tissues.

Question 17

Discuss the different types of nutrition and give examples of organisms that use each type.

Answer

Nutrition is the process of providing or obtaining nutrients necessary for health and growth. It can be autotrophic (autonomous), where organisms produce their own food through photosynthesis, as in plants, or it can be heterotrophic (alternative eating), where organisms rely on other organisms provide food like animals

Question 18

Explain the concept of homeostasis and its importance in the survival of organisms.

Answer

Homeostasis is the ability of an organism to maintain a constant internal state despite changes in external conditions. It is essential for life because it allows organisms to function properly under different conditions. Examples include temperature control, pH balance, and fluid and electrolyte balance.

Question 19

Explain the process of nerve impulse transmission in the human body.

Answer

Nerve impulses in the human body begin when a signal stimulates a nerve. This changes the electric field of the muscle, producing an action force. This action potential travels along the axon of the nerve, a process called propagation. When the action potential reaches the end of a nerve, it releases neurotransmitters. These neurotransmitters cross the synapse (the nerve between neurons) and interact with the control of subsequent neurons, creating a new action potential in that neuron This process repeats itself, creating a neuron the sensation travels through the whole body.

Question 20

Discuss the role of hormones in the human body and how they assist in the regulation of various body functions.

Answer

Hormones are chemical messengers delivered directly into the bloodstream by the endocrine glands. They travel to specific organs or tissues where they bind to receptors and induce biological responses. For example, insulin is a hormone produced by the pancreas that regulates blood sugar levels by allowing glucose to enter cells. Thyroid hormones regulate metabolism, cardiac function, digestion, nerve control, brain development, and bone maintenance. Secondary sexual symptoms are produced by hormones such as estrogen and testosterone. Hormones thus play an important role in maintaining homeostasis and regulating bodily functions.