Control and Coordination
- What is the difference between the manner in which movement takes place in a sensitive plant The movement of sensitive plants leaves takes place due to the sudden loss of water in the pad-like swelling (called pulvini) at the base of... 1
- Compare and contrast nervous and hormonal mechanisms for control and coordination in animals Difference between nervous and hormonal mechanism: Nervous system Hormonal system 1. Made up of neurons (nerve cell). 1. Made of secretory c... 1
- How are involuntary actions and reflex actions different from each other? Involuntary actions are not controlled by us they are independent process means there is no stimulus involved in these actions but reflex ac... 2
- What is the need for a system of control and coordination in an organism? Controlled movement must be connected to the recognition of various events in the environment, followed by only the correct movement in resp... 2
- How does chemical coordination occur in plants? Plants do not have nervous system but still sense the things because of stimulus such as gravity, light, chemicals(hormones), water, touch (... 1
- Which signals will get disrupted in case of a spinal cord injury? Reflex actions are involuntary actions and controlled by the spinal cord thus, gets disrupted in case of spinal cord injury. 2
- How does phototropism occur in plants? https://lh3.googleusercontent.com/-ZXrsr0D8MKg/YbXbLqNVhxI/AAAAAAAAC6s/VoLxyXZwcDAangRD7Xr1wpTage9Slbc1ACNcBGAsYHQ/image.png Photo means lig... 2
- Draw the structure of a neuron and explain its function. A neurons consists of three parts; (i) Cell body: It is a typical animal cell which contains cytoplasm and a nucleus. (ii) Dendrites: A numb... 1
- What is the function of receptors in our body? Think of situations where receptors do not work properly. All information from our environment is detected by the specialised tips of some nerve cells. These receptors are usually located in our sen... 1
- The brain is responsible for (a) thinking. (b) regulating the heart beat Correct option is d) all of the above. 2
- The gap between two neurons is called a (a) dendrite. (b) synapse. Correct option is b) synapse. 2
- Which of the following is a plant hormone? (a) Insulin (b) Thyroxin (c) Oestrogen (d) Cytokinin Correct option is d) Cytokinin 2
- 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