Question 11 Mark
Loss of water as droplets from the margins of certain leaves.
Answer
View full question & answer→Guttation
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Question 21 Mark
The structure in a leaf that allows guttation.
Answer
View full question & answer→Hydathodes
Question 31 Mark
Any two parts of a leaf which allows transpiration.
Answer
View full question & answer→Stomata and cuticle
Question 41 Mark
The apparatus to record the rate of transpiration in a cut shoot.
Answer
View full question & answer→Ganong's photometer
Question 51 Mark
A plant in which the stomata are sunken.
Answer
View full question & answer→Nerium
Question 61 Mark
An instrument used to find the rate of transpiration.
Answer
View full question & answer→Potometer
Question 71 Mark
The process by which the intact plant loses water in the form of droplet.
Answer
View full question & answer→Guttation
Question 81 Mark
openings on the stem through which transpiration occurs.
Answer
View full question & answer→Lenticels
Question 91 Mark
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 :
Suggest a suitable control for this experiment.
Suggest a suitable control for this experiment.
Answer
View full question & answer→A control for this experiment will be an empty polythene bag with its mouth tied.
Question 101 Mark
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 :
Why was the pot covered with a plastic sheet?
Why was the pot covered with a plastic sheet?
Answer
View full question & answer→The pot is covered with a plastic sheet to prevent evaporation of water from the soil.
Question 111 Mark
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 :
Explain the process named above in 7.1.
Explain the process named above in 7.1.
Answer
View full question & answer→Transpiration is a process during which water is lost in the form of water vapour through aerial parts of the plant.
Question 121 Mark
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.
Name the process being studied.
Answer
View full question & answer→Transpiration
Question 131 Mark
The figure given below represents an experimental setup with a weighing machine to demonstrate a particular process in plants. The experimental setup was placed in bright sunlight. Study the diagram and answer the following questions.
What is the purpose of keeping the test tube B in the experimental setup?
What is the purpose of keeping the test tube B in the experimental setup?
Answer
View full question & answer→Test tube B is used here as a control. This makes the observation of the change in test tube A easy.
Question 141 Mark
The figure given below represents an experimental setup with a weighing machine to demonstrate a particular process in plants. The experimental setup was placed in bright sunlight. Study the diagram and answer the following questions
When the weight of the test tubes A and B is taken before and after the experiment, what change is observed? Justify.
When the weight of the test tubes A and B is taken before and after the experiment, what change is observed? Justify.
Answer
View full question & answer→Weight of test tube A before the experiment was more than its weight after the experiment. This is because water from test tube A has evaporated due to transpiration.
Weight of test tube B remains the same before and after the experiment, because no loss of water occurs in test tube B.
Question 151 Mark
The figure given below represents an experimental setup with a weighing machine to demonstrate a particular process in plants. The experimental setup was placed in bright sunlight. Study the diagram and answer the following questions.
Name the process intended for study.
Name the process intended for study.
Answer
View full question & answer→Transpiration
Question 161 Mark
The apparatus shown in the following diagram is Garreau’s potometer designed to demonstrate unequal transpiration from the two surfaces of a dorsiventral leaf. Before keeping the leaf in between the cups, anhydrous calcium chloride $(CaCl_2)$ contained in two small vials were weighed and placed in both the cups. The ends of the cups were closed with corks through which two mercury manometers were connected. After few hours, $CaCl_2$ vials were taken out and weighed again.
What do you mean by transpiration?
What do you mean by transpiration?
Answer
View full question & answer→Transpiration is the loss of water in the form of water vapour from the aerial parts (leaves and stem) of the plant.
Question 171 Mark
The apparatus shown in the following diagram is Garreau’s potometer designed to demonstrate unequal transpiration from the two surfaces of a dorsiventral leaf. Before keeping the leaf in between the cups, anhydrous calcium chloride ($CaCl_2$) contained in two small vials were weighed and placed in both the cups. The ends of the cups were closed with corks through which two mercury manometers were connected. After few hours, $CaCl_2$ vials were taken out and weighed again.
After few hours $CaCl_2$ vials were taken out and weighed again. Will you expect any difference in weight? If so, give reason.
After few hours $CaCl_2$ vials were taken out and weighed again. Will you expect any difference in weight? If so, give reason.
Answer
View full question & answer→Yes, after few hours the weight of the $CaCl_2$ vials will increase because they will absorb water lost by the leaf of the plant due to transpiration.
Question 181 Mark
The apparatus shown in the following diagram is Garreau’s potometer designed to demonstrate unequal transpiration from the two surfaces of a dorsiventral leaf Before keeping the leaf in between the cups, anhydrous calcium chloride ($CaCl_2$) contained in two small vials were weighed and placed in both the cups. The ends of the cups were closed with corks through which two mercury manometers were connected. After few hours, $CaCl_2$ vials were taken out and weighed again.
What is the purpose of keeping $CaCl_2$ vials inside the cup?
What is the purpose of keeping $CaCl_2$ vials inside the cup?
Answer
View full question & answer→$CaCl_2$ is a hygroscopic compound that absorbs moisture/water without changing its state. $CaCl_2$vials inside the cup to absorb water.
Question 191 Mark
Given ahead is the diagram of an experimental set up to study the process of transpiration in plants. Study the same and then answer the question that follow:
After about half an hour what change, if any, would you expect to find in the cobalt chloride paper placed on the dorsal and ventral sides of the leaf? Give a reason to support your answer.
After about half an hour what change, if any, would you expect to find in the cobalt chloride paper placed on the dorsal and ventral sides of the leaf? Give a reason to support your answer.
Answer
View full question & answer→The cobalt chloride paper placed on the lower surface of the leaf will show more pink dots as there are more stomata. The upper surface has less stomata than the lower surface.
Question 201 Mark
Given ahead is the diagram of an experimental set up to study the process of transpiration in plants. Study the same and then answer the question that follow:
Why are glass slides placed over the dry cobalt chloride papers?
Why are glass slides placed over the dry cobalt chloride papers?
Answer
View full question & answer→Glass slides are placed over the dry cobalt chloride papers so as to retain the strips in their position.
Question 211 Mark
Given ahead is the diagram of an experimental set up to study the process of transpiration in plants. Study the same and then answer the question that follow:
Name the colour of dry cobalt chloride paper.
Name the colour of dry cobalt chloride paper.
Answer
View full question & answer→Blue.
Question 221 Mark
Given below is the diagram of an apparatus used to study a particular phenomenon in plants:
What is the use of the reservoir?
What is the use of the reservoir?
Answer
View full question & answer→The water in the reservoir can be released into the capillary tube by opening the stop cock. This allows the air bubble to restore back to its original position.
Question 231 Mark
Given below is the diagram of an apparatus used to study a particular phenomenon in plants:
What is the role played by the air-bubble in this experiment?
What is the role played by the air-bubble in this experiment?
Answer
View full question & answer→The movement of the air bubble and its position in the capillary tube indicates the volume of water lost through transpiration in a given time.
Question 241 Mark
Given below is the diagram of an apparatus used to study a particular phenomenon in plants:
What is it used for?
What is it used for?
Answer
View full question & answer→Ganong’s potometer is used to measure the water intake of a plant which is almost equal to the water lost through transpiration.
Question 251 Mark
Given below is the diagram of an apparatus used to study a particular phenomenon in plants:
Name the apparatus.
Name the apparatus.
Answer
View full question & answer→Ganong’s potometer
Question 261 Mark
Given alongside is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants.
Would it make a difference if the experimental set-up is kept in bright sunshine?
Would it make a difference if the experimental set-up is kept in bright sunshine?
Answer
View full question & answer→Yes, the transpiration rate will increase. Transpiration would occur faster. The observable changes will occur in less time.
Question 271 Mark
Given alongside is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants.
What is the purpose of putting oil in the test tube?
What is the purpose of putting oil in the test tube?
Answer
View full question & answer→Oil is put on the surface of water to prevent loss of water by evaporation.
Question 281 Mark
Given alongside is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants.
Name the phenomenon being demonstrated.
Name the phenomenon being demonstrated.
Answer
View full question & answer→Transpiration
Question 291 Mark
Give suitable explanation for the following:
Excessive transpiration results in the wilting of the leaves.
Excessive transpiration results in the wilting of the leaves.
Answer
View full question & answer→When the rate of transpiration far exceeds the rate of absorption of water by roots, the cells lose their turgidity. Hence, excessive transpiration results in wilting of the leaves.
Question 301 Mark
Given below is an example of a certain structure and its special functional activity:
chloroplasts and photosynthesis
In a similar way, write the functional activity against each of the following:
Xylem and ...................................
Answer
View full question & answer→Xylem and conduction of water and mineral salts
Question 311 Mark
Given below is an example of a certain structure and its special functional activity:
Chloroplasts and Photosynthesis.
In a similar way, write the functional activity against each of the following:
Lenticels and ……………………………
Chloroplasts and Photosynthesis.
In a similar way, write the functional activity against each of the following:
Lenticels and ……………………………
Answer
View full question & answer→Lenticels and transpiration
Question 321 Mark
Given below is an example of a certain structure and its special functional activity:
Chloroplasts and Photosynthesis.
In a similar way, write the functional activity against each of the following:
Leaf spines and …………………………
Chloroplasts and Photosynthesis.
In a similar way, write the functional activity against each of the following:
Leaf spines and …………………………
Answer
View full question & answer→Leaf spines and protection and reduced transpiration
Question 331 Mark
Given below is an example of a certain structure and its special functional activity:
Chloroplasts and Photosynthesis.
In a similar way, write the functional activity against each of the following:
Hydathodes and ……………………….
Chloroplasts and Photosynthesis.
In a similar way, write the functional activity against each of the following:
Hydathodes and ……………………….
Answer
View full question & answer→Hydathodes and guttation
Question 341 Mark
Explain the term :
Transpiration
Transpiration
Answer
View full question & answer→Transpiration : Transpiration is the process where plants absorb water through the roots and then release it as water vapor from their leaves, stems, and flowers. It helps in nutrient transport, temperature regulation, and contributes to the water cycle.
Question 351 Mark
Name the Following :
The openings on the barks of trees through which transpiration occurs.
The openings on the barks of trees through which transpiration occurs.
Answer
View full question & answer→Lenticels
Question 361 Mark
Explain the term :
Wilting
Wilting
Answer
View full question & answer→Wilting : The collapsing of plant cells due to unfavorable water relations is called wilting.It may be due to excessive transpiration as compared to absorption of water by roots.It may also be due to blocking of the xylem elements, pathogens or parasites.
Question 371 Mark
Explain the term :
Hydathode
Hydathode
Answer
View full question & answer→Hydathode : A water secreting gland found on the edges and tips of leaves of many plants.
Question 381 Mark
Explain the term :
Lenticel
Lenticel
Answer
View full question & answer→Lenticel : It is a pore in the periderm of a woody stem. It acts as an organ of gaseous exchange and transpiration.
Question 391 Mark
Explain the term :
Bleeding
Bleeding
Answer
View full question & answer→Bleeding : Exudation of cell sap or watery solution from the injured parts of a plant.
Question 401 Mark
Explain the term :
Guttation
Guttation
Answer
View full question & answer→Guttation: The exudation of water in the form of water droplets along with sugar and mineral salts through specialised openings i.e., hydathodes, present along the margins of a leaf is called guttation.
Question 411 Mark
Explain the term :
Stomatal transpiration
Stomatal transpiration
Answer
View full question & answer→Stomatal transpiration : Transpiration that takes place through the stomata of the leaves is called stomatal transpiration.
Question 421 Mark
Explain the term :
Lenticular transpiration
Lenticular transpiration
Answer
View full question & answer→Lenticular transpiration : Transpiration that takes place through the small openings in the cork tissue covering the stem is called lenticular transpiration.
Question 431 Mark
Explain the term :
Cuticular transpiration
Cuticular transpiration
Answer
View full question & answer→Cuticular transpiration : Transpiration that takes place through the cuticle (waxy layer) covering the leaves is called cuticular transpiration.
Question 441 Mark
Name the Following :
Type of transpiration that takes place from the minute openings on the surface of the old stems.
Type of transpiration that takes place from the minute openings on the surface of the old stems.
Answer
View full question & answer→Lenticular transpiration
Question 451 Mark
Name the Following :
Type of transpiration that takes place directly from the surface of the leaf.
Type of transpiration that takes place directly from the surface of the leaf.
Answer
View full question & answer→Cuticular transpiration
Question 461 Mark
Name the Following :
The process by which excess of water is forced out directly from the tips of veins in the leaf.
The process by which excess of water is forced out directly from the tips of veins in the leaf.
Answer
View full question & answer→Guttation
Question 471 Mark
Name the Following :
The apparatus used to measure the rate of transpiration in a plant.
The apparatus used to measure the rate of transpiration in a plant.
Answer
View full question & answer→Potometer
Question 481 Mark
Name the Following :
The substances which reduce the rate of transpiration.
The substances which reduce the rate of transpiration.
Answer
View full question & answer→Anti-transpirants
Question 491 Mark
Name the Following :
Tissue that transports water to all parts of the plant.
Tissue that transports water to all parts of the plant.
Answer
View full question & answer→Xylem
Question 501 Mark
Name the Following :
The kidney-shaped cells present on stomata.
The kidney-shaped cells present on stomata.
Answer
View full question & answer→Guard cells