Note Of Root Pressure
9th Std
Chapter Number 15. Life Processes In Living Organisms.
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Answers
Answer:
Root Pressure'. It is the transverse osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves. Root pressure occurs in the xylem of some vascular plants when the soil moisture level is high either at night or when transpiration is low during the day.
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Explanation:
Life Processes In Living Organisms, an important topic from Class 9 Science is discussed at length in this chapter, here. The concepts that are covered in this chapter includes Transportation in Plants, Excretion: Plants, Animals and Humans, Co-ordination: Plants and Humans and more. Students can learn the subject well by referring to these MSBSHSE Class 9 Solutions of Science Chapter 15 Life Processes In Living Organisms.
These solutions, prepared after proper research will help students to get a thorough conceptual understanding. The content is well-structured, thus making it easier for the students to learn the subject. This solution, deals with the topics according to the new MSBSHSE Syllabus for Class 9. The solutions to the questions listed here are designed, so as to help students ace the exams. Hence, solving these questions for practice and giving highly relevant answers will help the students to perform well.
Maharashtra Board Class 9 Science Chapter 15- BYJU’S Important Questions & Answers
1.Match the pairs and explain.
ABGrowth of pollen tube towards ovuleGravitropic movementGrowth of shoot systemChemotropic movementGrowth of root systemPhototropic movementGrowth towards waterGrowth-irrelevant movementHydrotropic movement
Answer:
ABGrowth of pollen tube towards ovuleChemotropic movementGrowth of shoot systemPhototropic movementGrowth of root systemGravitropic movementGrowth towards waterHydrotropic movement
2. Write notes on root pressure.
Answer: Take a small plant such as a balsam or tuberose with roots intact. Then, wash and clean its roots and keep it in the water consisting of a stain like safranin or eosin. Then, after 2-3 hours, observe the stem and the veins of the leaves. You can also take a compound microscope to observe the stained xylem of a transverse section of the stem of a plant. You can see that the root cells have reached the water and minerals in the soil. The water and minerals enter the cells on the root surface, as a result of the differences in concentration and these cells become turgid. The pressure that these turgid cells exert on the adjacent cells is the ‘root pressure’. Because of the effect of this pressure, water and minerals reach the xylem of the roots, which are continuously pushed forward so as to reduce the difference in concentration. This continuous movement also results in the formation of a water column that is continuously pushed ahead. This is enough pressure to lift the water up in shrubs, small plants and small trees.
3. Write notes on Transpiration.
Answer: When you observe a branch covered in a plastic bag, you will see that the plants via the stomata on their leaves releases water in the form of vapour. Stomata also has two cells called guard cells present around it, which controls the opening and closing of stomata. Transpiration takes place via these stomata. By the process of evaporation, the leaves give out water into the atmosphere, thus decreasing the water level in the epidermal level. In order to compensate for this water level, the water is then brought up to the leaves through the xylem. Transpiration helps in absorbing water and minerals and its distribution to all parts of the plant. Meanwhile, root pressure performs the important role of pushing the water up during the night time.
4. What is a Nerve cell?
Answer: Neurons are the special types of cells that conduct impulses from one place to another in the body. They are the structural