Table of Contents
Ans. (c)
Explanation:
The kidneys are bean-shaped, reddish-brown organs that are part of the excretory system. They play a crucial role in the process of urine formation, which involves filtering waste products and excess substances from the blood, thereby helping in the elimination of waste from the body. Hence, the kidneys are involved in the process of excretion.
Ans. (a)
Explanation:
Mucus is a thick fluid secreted by the inner lining of the stomach . It protects the lining of the stomach from gastric juice. i.e hydrochloric acid. It prevents the stomach’s own acidic gastric juices from damaging the stomach lining and helps to protect the mucous membrane from auto-digestion.
Explanation:
The iodine test specifically identifies the presence of starch, a polysaccharide produced during photosynthesis. Starch is a common carbohydrate stored in plants. If a leaf has undergone photosynthesis, it will have produced glucose, some of which is converted into starch for storage. Thus, performing the iodine test on a leaf helps confirm that photosynthesis has occurred in that leaf.
Explanation:
Guard cells are kidney shaped cells which contain thicker inner walls and thin outer walls. During day time they perform photosynthesis due to the presence of chloroplasts in them. Due to increase in solute concentration inside the guard cells, water from subsidiary cells rushes inside by osmosis process as a result guard cells swell up. The thin outer wall bulges out and the thick inner wall is pulled inside thus stomata opens. During night time reverse happens, water rushes out from the guard cells and they become flaccid closing the stomatal pore. Thus turgor pressure of guard cells helps in closing and opening of stomata.
Explanation:
The transport of food from the leaves to the other parts of the plant is called translocation. Food is transported in plants through phloem. Phloem has sieve tubes which are the living cells. Sieve tubes are connected to each other by sieve plates which have small holes in them and which allows the food in solution form to pass through them. Interconnected phloem tubes are present in all parts of the plant so food is carried from leaves to all the parts of the plant. The translocation process requires energy in the form of ATP. The glucose which is made in leaves is loaded into sieve tubes of phloem tissue by using ATP, water enters into this tissue by osmosis now high pressure is created which helps in movement of food to low pressure region.
| Chapter No. | Chapter Name |
|---|---|
| Chapter 1 | Chemical Reactions and Equations |
| Chapter 2 | Acid, Bases and Salts |
| Chapter 3 | Metals and Non-Metals |
| Chapter 4 | Carbon and its Compounds |
| Chapter 5 | Life Processes |
| Chapter 6 | Control and Coordination |
| Chapter 7 | How do Organisms Reproduce |
| Chapter 8 | Heredity |
| Chapter 9 | Light : Reflection and Refraction |
| Chapter 10 | The Human Eye and the Colourful world |
| Chapter 11 | Electricity |
| Chapter 12 | Magnetic Effects of Electric Current |
| Chapter 13 | Our Environment |
| Chapter Wise Important Questions for CBSE Board Class 10 Science |
|---|
| Chemical Reactions and Equations |
| Acid, Bases and Salts |
| Metals and Non-Metals |
| Carbon and its Compounds |
| Life Processes |
| Control and Coordination |
| How do Organisms Reproduce |
| Heredity |
| Light : Reflection and Refraction |
| The Human Eye and the Colourful world |
| Electricity |
| Magnetic Effects of Electric Current |
| Our Environment |
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