In a thermal power plant, fossil fuel (coal, oil or gas) is burnt up continuously to produce heat. This heat is used up to convert water into steam. The steam is utilised to run the turbine of power plant, as a result of which electrical energy produced.
In a thermal power plant, fossil fuel (coal, oil or gas) is burnt up continuously to
produce heat. This heat is used up to convert water into steam. The steam is utilised to run the turbine of power plant, as a result of which electrical energy produced.
(a) The new collector of the district is sympathetic to the problem faced by the villagers. He believes in welfare activity and took a prompt action in solving the problem brought to his notice. (b) Due to installation of solar panels the villagers (i) got rid of pollution caused by burning of wood,Read more
(a) The new collector of the district is sympathetic to the problem faced by the villagers. He believes in welfare activity and took a prompt action in solving the problem brought to his notice.
(b) Due to installation of solar panels the villagers (i) got rid of pollution caused by burning of wood, and (ii) were able to save money and valuable forest resources because solar energy is freely available and is a renewable form of energy.
Even though plants do not have muscle cells or nervous control, yet they show two types of movements: (a) Movement in response to stimulus i.e., Nastic movement. (b) Movement due to growth i.e., Tropic movement. Nastic movements are quick, in response to certain stimulus, for example 'touch' in 'TouRead more
Even though plants do not have muscle cells or nervous control, yet they show two types of movements:
(a) Movement in response to stimulus i.e., Nastic movement.
(b) Movement due to growth i.e., Tropic movement. Nastic movements are quick, in response to certain stimulus, for example ‘touch’ in ‘Touch me- not’ plant, reversible, not affected by the direction of the stimulus. Tropic movements on the other hand ate slow, growth related, irreversible and towards or away from the direction of the stimulus, for example, growth of roots towards the earth and growth of shoot towards sun.
Differences between transport of material in: Xylem:- (i) Movement of materials in one direction only. (ii) Only physical factors involved in transportation of water through xylem. (iii) Transportation of material through xylem is in form of a solution i.e', ions dissolved in water. Phloem:- (i) MovRead more
Differences between transport of material in:
Xylem:-
(i) Movement of materials in one direction only.
(ii) Only physical factors involved in transportation of water through xylem.
(iii) Transportation of material through xylem is in form of a solution i.e’, ions
dissolved in water.
Phloem:-
(i) Movement of materials in all directions
(ii) Translocation of organic solutes through phloem is an active Process, requiring energy.
(iii) Translocation through phloem is that of solute Le., sucrose
(i) Water is added to quicklime - Exothermic (ii) Dilute sulphuric acid is added to zinic granules - Exothermic (iii) Ammonium chloride is dissolved in water in a test tube - Endothermic (iv) The decomposition of vegetable mattel into compost - Exothermic (v) Electrolysis of water - Endothermic (vi)Read more
(i) Water is added to quicklime – Exothermic
(ii) Dilute sulphuric acid is added to zinic granules – Exothermic
(iii) Ammonium chloride is dissolved in water in a test tube – Endothermic
(iv) The decomposition of vegetable mattel into compost – Exothermic
(v) Electrolysis of water – Endothermic
(vi) Silver chloride turns grey in the presence of sunlight to form silver metal – Endothermic.
(a) (i) Lemon juice - 2.0 (ii) Tomato juice - 4.0 (iii) Distilled water - 7.0 (iv) Sodium hydroxide solution - 14.0 (b) Soda water is water containing dissolved carbon dioxide. It is acidic therefore blue litmus solution will turn red.
(a) (i) Lemon juice – 2.0
(ii) Tomato juice – 4.0
(iii) Distilled water – 7.0
(iv) Sodium hydroxide solution – 14.0
(b) Soda water is water containing dissolved carbon dioxide. It is acidic therefore blue litmus solution will turn red.
Food is translocated from leaves to other parts of the plant through phloem. The organic matter, in the form of sucrose, is translocated from mesophyll cells to phloem, using ATP. The increased osmotic pressure causes water from neighbouring cells to move in. This increased pressure moves the sucrosRead more
Food is translocated from leaves to other parts of the plant through phloem. The organic matter, in the form of sucrose, is translocated from mesophyll cells to phloem, using ATP. The increased osmotic pressure causes water from neighbouring cells to move in. This increased pressure moves the sucrose to phloem and to tissues which have less pressure. Once sucrose has been moved out of a cell, using ATP, the water moves back into neighbouring cells. This way phloem is able to send the sucrose according to plants needs.
Explain how electricity is generated in a thermal power plant.
In a thermal power plant, fossil fuel (coal, oil or gas) is burnt up continuously to produce heat. This heat is used up to convert water into steam. The steam is utilised to run the turbine of power plant, as a result of which electrical energy produced.
In a thermal power plant, fossil fuel (coal, oil or gas) is burnt up continuously to
See lessproduce heat. This heat is used up to convert water into steam. The steam is utilised to run the turbine of power plant, as a result of which electrical energy produced.
ln a remote village of a hilly state, villagers were facing a lot of problems in daily life because of difficult terrain and their village was still not electrified. They were burning wood to keep the area lighted during night to keep away animals. This came to the knowledge of newly appointed collector of the district. He immediately installed solar panels in the village and lot of their problems were solved. (a) State the values exhibited by the collector. (b) Explain two advantages to the villagers due to installation of solar panels.
(a) The new collector of the district is sympathetic to the problem faced by the villagers. He believes in welfare activity and took a prompt action in solving the problem brought to his notice. (b) Due to installation of solar panels the villagers (i) got rid of pollution caused by burning of wood,Read more
(a) The new collector of the district is sympathetic to the problem faced by the villagers. He believes in welfare activity and took a prompt action in solving the problem brought to his notice.
See less(b) Due to installation of solar panels the villagers (i) got rid of pollution caused by burning of wood, and (ii) were able to save money and valuable forest resources because solar energy is freely available and is a renewable form of energy.
Calculate the resistance of 5 m length of a wire of area of cross-section 0.01 mm² and resistivity 5.03 x 10 ⁻8 ohm metre.
Here length L =5 m, area of cross-section A =0.01 mm² =0.01 x 10⁻⁶ m² = 1.0x10⁻⁸ m² and resistivity p = 5.03 x 10⁻⁸ = 25.15Ω
Here length L =5 m, area of cross-section A =0.01 mm² =0.01 x 10⁻⁶ m² = 1.0×10⁻⁸ m² and resistivity p = 5.03 x 10⁻⁸ = 25.15Ω
See lessIn the absence of muscle cells, how do plant cells show movements?
Even though plants do not have muscle cells or nervous control, yet they show two types of movements: (a) Movement in response to stimulus i.e., Nastic movement. (b) Movement due to growth i.e., Tropic movement. Nastic movements are quick, in response to certain stimulus, for example 'touch' in 'TouRead more
Even though plants do not have muscle cells or nervous control, yet they show two types of movements:
See less(a) Movement in response to stimulus i.e., Nastic movement.
(b) Movement due to growth i.e., Tropic movement. Nastic movements are quick, in response to certain stimulus, for example ‘touch’ in ‘Touch me- not’ plant, reversible, not affected by the direction of the stimulus. Tropic movements on the other hand ate slow, growth related, irreversible and towards or away from the direction of the stimulus, for example, growth of roots towards the earth and growth of shoot towards sun.
State the difference between transport of materials in xylem and phloem.
Differences between transport of material in: Xylem:- (i) Movement of materials in one direction only. (ii) Only physical factors involved in transportation of water through xylem. (iii) Transportation of material through xylem is in form of a solution i.e', ions dissolved in water. Phloem:- (i) MovRead more
Differences between transport of material in:
See lessXylem:-
(i) Movement of materials in one direction only.
(ii) Only physical factors involved in transportation of water through xylem.
(iii) Transportation of material through xylem is in form of a solution i.e’, ions
dissolved in water.
Phloem:-
(i) Movement of materials in all directions
(ii) Translocation of organic solutes through phloem is an active Process, requiring energy.
(iii) Translocation through phloem is that of solute Le., sucrose
Classify the following chemical reactions as exothermic or endothermic: (i) Water is added to quicklime. (ii) Dilute sulphuric acid is added to zinc granules. (iii) When ammonium chloride is dissolved in water in a test tube it becomes cold. (iv) The decomposition of vegetable matter into compost. (v) Electrolysis of water. (vi) Silver chloride turns grey in the Presence of sunlight to form silver metal’
(i) Water is added to quicklime - Exothermic (ii) Dilute sulphuric acid is added to zinic granules - Exothermic (iii) Ammonium chloride is dissolved in water in a test tube - Endothermic (iv) The decomposition of vegetable mattel into compost - Exothermic (v) Electrolysis of water - Endothermic (vi)Read more
(i) Water is added to quicklime – Exothermic
See less(ii) Dilute sulphuric acid is added to zinic granules – Exothermic
(iii) Ammonium chloride is dissolved in water in a test tube – Endothermic
(iv) The decomposition of vegetable mattel into compost – Exothermic
(v) Electrolysis of water – Endothermic
(vi) Silver chloride turns grey in the presence of sunlight to form silver metal – Endothermic.
What happens when dilute hydrochloric acid is added to the following? Write balanced chemical equations: (i) Bleaching powder (ii) Zinc granules (iii) Baking soda.
(i) CaOC1₂ + 2HC1 ⟶ Ca1₂ + H₂O +C1₂ (ii) Zn + 2H1 (aq) ⟶ Znc1₂(aq) + H₂(g) (iii) NaHCO₃ (s) + HC1(aq) ⟶ CO₂(g) + H₂O (l)
(i) CaOC1₂ + 2HC1 ⟶ Ca1₂ + H₂O +C1₂
See less(ii) Zn + 2H1 (aq) ⟶ Znc1₂(aq) + H₂(g)
(iii) NaHCO₃ (s) + HC1(aq) ⟶ CO₂(g) + H₂O (l)
Write chemical equations for the reactions taking place when: (i) Iron reacts with steam. (ii) Magnesium (Mg) reacts with dil. HCl. (iii) Copper is heated in air.
(i) Iron reacts with steam 3Fe(s) + 4H₂O (g) ⟶ Fe₃O₄ + 4H₂ (ii) Magnesium reacts with dil. HC1 Mg + 2HC1 ⟶ MgC1₂ + H₂ (iii) Copper is heated in air. 2Cu + O₂ ⟶ 2Cuo
(i) Iron reacts with steam
See less3Fe(s) + 4H₂O (g) ⟶ Fe₃O₄ + 4H₂
(ii) Magnesium reacts with dil. HC1
Mg + 2HC1 ⟶ MgC1₂ + H₂
(iii) Copper is heated in air.
2Cu + O₂ ⟶ 2Cuo
(a) Given below are the pH values of four different liquids: 7.0, 14.0, 4.0, 2.0 Which of these could be that of (i) lemon juice (ii) distilled water (iii) sodium hydroxide solution (iv) tomato juice? (b) When blue litmus solution is added to soda water, what change will be observed and why?
(a) (i) Lemon juice - 2.0 (ii) Tomato juice - 4.0 (iii) Distilled water - 7.0 (iv) Sodium hydroxide solution - 14.0 (b) Soda water is water containing dissolved carbon dioxide. It is acidic therefore blue litmus solution will turn red.
(a) (i) Lemon juice – 2.0
See less(ii) Tomato juice – 4.0
(iii) Distilled water – 7.0
(iv) Sodium hydroxide solution – 14.0
(b) Soda water is water containing dissolved carbon dioxide. It is acidic therefore blue litmus solution will turn red.
How is food translocated from leaves to the other parts of the plant?
Food is translocated from leaves to other parts of the plant through phloem. The organic matter, in the form of sucrose, is translocated from mesophyll cells to phloem, using ATP. The increased osmotic pressure causes water from neighbouring cells to move in. This increased pressure moves the sucrosRead more
Food is translocated from leaves to other parts of the plant through phloem. The organic matter, in the form of sucrose, is translocated from mesophyll cells to phloem, using ATP. The increased osmotic pressure causes water from neighbouring cells to move in. This increased pressure moves the sucrose to phloem and to tissues which have less pressure. Once sucrose has been moved out of a cell, using ATP, the water moves back into neighbouring cells. This way phloem is able to send the sucrose according to plants needs.
See less