10th
- Why are some patients of diabetes treated by giving injections of insulin? Diabetes patients as a treatment, they might be taking injections of insulin. This is a hormone which is produced by the pancreas and helps... 1
- How does our body respond when adrenaline is secreted into the blood? Adrenaline is secreted directly into the blood and carried to different parts of the body. The target organs or the specific tissues on whic... 1
- Why is the use of iodised salt advisable? Iodine is necessary for the thyroid gland to make thyroxin hormone. Thyroxin regulates carbohydrate, protein and fat, metabolism in the body... 1
- How does chemical coordination take place in animals? The chemical coordination in animals takes place by the action of chemical called hormones. They are produced in certain glands in body in v... 1
- Design an experiment to demonstrate hydrotropism. Hydro means water. Hydrotropism means growth towards water. https://lh3.googleusercontent.com/--CNOWgtBGTg/YbR7EUm3raI/AAAAAAAAC6g/kflDtlZB5... 1
- How do auxins promote the growth of a tendril around a support? Auxin is a plant growth hormone. When the tip of the tendril touches a support, then the auxins present on its tip moves to the side of tip... 1
- Give an example of a plant hormone that promotes growth. Auxin is an example of plant hormone that promotes growth 2
- How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light? The main differences between the movement of the leaves of a sensitive plant and the movement of a shoot towards light are as follows: Movem... 1
- What are plant hormones? The chemical substances produced in plants which control growth, development and responses in plants, are called plants plant hormones. For... 1
- What is the role of the brain in reflex action? Reflex action occurs in spinal cord. The brain and spinal cord constitute the central nervous system. They receive information from all part... 2
- How do we detect the smell of an agarbatti (incense stick)? When agarbatti burns, it produces pleasant smell, which is detected by the olfactory receptor present inside the nose. The action of smell g... 1
- Which part of the brain maintains posture and equilibrium of the body? Cerebellum is a part of the brain maintains posture and equilibrium of the body 1
- What happens at the synapse between two neurons? The synapse is the tiny gap (not seen by naked eyes) between two adjacent neurons. This information, acquired at the end of the dendritic ti... 1
- What is the difference between reflex action and walking? Reflex action is involuntary action which means it is not under control of brain only involves spinal cord, it is rapid, thus gives instant... 1
- Compare the functioning of alveoli in the lungs and nephrons in the kidneys Alveoli Nephrons Structure Structure Alveoli are tiny balloon-like structures present inside the lungs. Nephrons are tubular structures pres... 1
- What are the differences between the transport of materials in xylem and phloem? Xylem Phloem Xylem tissue helps in the transport of water and minerals. Phloem tissue helps in the transport of food. Water is transported u... 1
- Describe double circulation in human beings. Why is it necessary? During a single cycle blood goes twice in the heart which is known as double circulation. It is necessary in human being to separate oxygena... 2
- What would be the consequences of a deficiency of haemoglobin in our bodies? Haemoglobin is the respiratory pigment that transports oxygen to the body cells for cellular respiration. Therefore, deficiency of haemoglob... 1
- How are the alveoli designed to maximise the exchange of gases? Alveoli provide a surface for the exchange of gases. An extensive network of blood vessels is present in the wall of the alveoli. By lifting... 1
- What are the differences between aerobic and anaerobic respiration? Name some organisms Aerobic respiration Anaerobic respiration It occurs in the presence of O₂. It occurs in the absence of O₂. It involves the exchange of gases... 1
- What are the necessary conditions for autotrophic nutrition and what are its by-products? Autotrophic nutrition takes place through the process of photosynthesis. Carbon dioxide, water, chlorophyll pigment, and sunlight are the ne... 1
- What is the role of saliva in the digestion of food? The role of saliva in the digestion of food: - It moistens the food for easy swallowing. - It contains a digestive enzyme called salivary am... 1
- How are fats digested in our bodies? Where does this process take place? Fats are present in the form of large globules in the small intestine. The small intestine receives the secretions from the liver and the pa... 1
- The breakdown of pyruvate to give carbon dioxide, water and energy takes place in (a) cytoplasm. Correct option is b) mitochondria. 2