Why are some patients of diabetes treated by giving injections of insulin?
Insulin is a hormone produced in pancreas and that helps to control high glucose level. It converts the food which we are taking into the form of energy in the bloodstream.
Diabetes occurs when too much sugar is taken in food or found in blood (high blood glucose level). If any patient is suffering from diabetes, doctors give that patient a insulin injection and it cannot be taken as a pill because it is made up of protein or secreted in pancreas that if taken through mouth, then it is denatured by the digestive process.
Draw the structure of a neuron and explain its function.
Which signals will get disrupted in case of a spinal cord injury?
How does chemical coordination take place in animals?
Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
Why is the use of iodised salt advisable?
The brain is responsible for
(a) thinking.
(b) regulating the heart beat.
(c) balancing the body.
(d) all of the above.
How do we detect the smell of an agarbatti (incense stick)?
How do auxins promote the growth of a tendril around a support?
How does our body respond when adrenaline is secreted into the blood?
Which part of the brain maintains posture and equilibrium of the body?
Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
What is a good source of energy?
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
What changes can you make in your habits to become more environment-friendly?
What is the importance of DNA copying in reproduction?
If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
Why should a magnesium ribbon be cleared before burning in air?
Define the principal focus of a concave mirror.
You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?
What is meant by power of accommodation of the eye?
Why is respiration considered an exothermic reaction? Explain.
Where do plants get each of the raw materials required for photosynthesis?
State Fleming’s left-hand rule.
Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.
What are oxidising agents?
How are the alveoli designed to maximise the exchange of gases?
Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?
How are water and minerals transported in plants?
Which of the following are environment-friendly practices?
(a) Carrying cloth-bags to put purchases in while shopping
(b) Switching off unnecessary lights and fans
(c) Walking to school instead of getting your mother to drop you on her scooter
(d) All of the above