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प्रश्न
Briefly describe the following:
Angina Pectoris
उत्तर
- When enough oxygen does not reach the heart muscles, angina pectoris develops, causing chest pain and discomfort.
- Angina pectoris is the pain in the chest. It results from a reduction in blood supply to cardiac muscle due to narrowed and hardened coronary arteries.
- Angina pectoris often occurs during exertion, when the heart demands more oxygen and narrowed blood vessels cannot supply. It disappears with rest.
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संबंधित प्रश्न
An apparatus, as shown below, was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow:
- Name the process being studied.
- Explain the process named above in Q.3(a)(i).
- Why was the pot covered with a plastic sheet?
- Suggest a suitable control for this experiment.
- Mention two ways in which this process is beneficial to plants.
- List three adaptations in plants to reduce the above mentioned process.
Which of the following helps in the upward movement of water and dissolved minerals from the roots to the leaves through the stem?
Given alongside is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants.
What is the purpose of the spring balance in the set-up?
Define the following Term:
Transpiration
Complete the following by choosing the proper option.
Stomata : Transpiration :: Hydathode : ____________.
Boojho wanted to test the presence of starch in leaves. He performed the following steps.
- He took a leaf and boiled it in water.
- He placed the leaf in a petri dish and poured some iodine over it.
He did not get the expected result. Which step did he miss? Explain.
Analogy:
Photosynthesis: ______:: Transpiration: Stomata
Entry of water into root hair is the demonstration of which of the following process?
Plants show temporary and permanent wilting. Differentiate between the two. Do any of them indicate the water status of the soil?
Enlist different advantages of transpiration.
