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Syllabus
(iii) Why have the two kinds of molecules been shown in different sizes?
(a) Name the process.
(b) Define the above-named process.
(c) What would you observe in the experimental set-up after an hour or so?
(d) What control experiment can be set up for comparison?
(e) Keeping in mind the root-hair, cell and its surroundings, name the parts that correspond to (1) concentrated sugar solution (2) parchment paper and (3) water in the beaker.
(f) Name any other substance that can be used instead of parchment paper in the above experiment.
(g) Mention any two advantages of the process to the plants.
Q. Name the following:
A . Which leaf dries first?
B. Which leaf dries last?
C. Which leaf does not show any change?
(a) Dark reaction of photosynthesis occurs during night time.
(b) Immediate product of photosynthesis is glucose.
(c) Starch produced in a leaf remains stored in it for 2-3 weeks before it is used by other parts of the plant.
(d) Photosynthesis requires enzymes.
(e) Green plants are consumers.
(f) Photosynthesis result in lose of dry weight of the plants.
(g) Photosynthesis stops at a temperature of about 35o C.
(h) Photosynthesis occurs only in cells containing chloroplasts.
(i) Green plants perform photosynthesis.
(j) Algae are autotrophs.
(a) The diagram given below shows the starting stage of an experiment. Study the same and answer the questions that follow:
(i) Name the phenomenon intended to be shown by this experiment? Define it.
(ii) Which limb of the U-tube, A or B, contains more concentrated solution and why?
(iii) Why are the two kinds of molecules shown in different sizes?
(iv) Mention the function of a semi-permeable membrane.
(v) Which limb of the U-tube, A or B, is functionally comparable to the root hair cell of a plant?
Q7. The figure given below represents an experimental set up with a weighing machine to demonstrate a particular process in plants. The experimental set up was placed in bright sunlight. Study the diagram and answer the following questions : (2014)
(a) Name the process intended for study.
(b) Define the above mentioned process.
(c) When the weight of the test tubes A and B is taken before and after the experiment, what change is observed ? Justify.
(d) What is the purpose of keeping the test tube B in the experimental set up?
Q.6. Given below is the diagrammatic representation of the transverse section of a part of a plant. Study it and answer the questions that follow:
(a) Name the part of the plant that is shown.
(b) Label the parts 1 to 6.
(c) Write the functions of parts 3 and 5.
Q4. Are the following statements true or false ? Give reason in support of your answer.
(a) The rate of photosynthesis continues to rise as long as the intensity of light rises.
(b) The outside atmospheric temperature has no effect on the rate of photosynthesis.
(c) If you immerse a leaf intact on the plant in ice cold water, it will continue to photosynthesise in bright sunshine.
(d) Destarching of the leaves of a potted plant can occur only at night.
(e) The starting point of carbon cycle i the release of CO2 by animals during respiration.
(f) If a plant is kept in bright light all the 24 hours for few days, the dark reaction (biosynthetic phase ) will fail to occur.
(g) Photosynthesis is considered as a process supporting all life on earth.
Q6. Given alongside is the diagram of an experimental set-up :
(a) What is the objective of this experiment ?
(b) Will it work satisfactorily ? Give reason.
(c) What alteration (s) will you make in it for obtaining expected result ?
(d) Would you take any step before starting the experiment? Describe this step and explain its
Q4. Which of the following statements are true and which ones are false ? Give reason in support of your answer.
(a) Potometer is an instrument used for demonstration of transpiration occurring from the lower surface of a leaf.
(b) Forests contribute in bringing rains.
(c) Hydathodes are similar to stomata in plant physiology.
(d) Atmospheric humidity promotes transpiration from a green plant.
(e) Some desert plants have sunked stomata on their leaves.
(f) Most transpiration occurs during midday.
2. Part which contributes majorly in process of transpiration
3. Function of endodermis
4. Phenomenon of contraction of cytoplasm from cell wall
5. Q.2(a) in the picture
2. (a) Given below is an outline of the plant cell showing different pressure exerted on it when placed in a solution.
(i) Name the parts labelled as A, B and C respectively.
(ii) What will happen if this plant cell is placed in a hypertonic solution?
(iii) Consider the given plant cell and answer that in which solution this cell is placed.
(iv) Explain the process of plasmolysis and flaccid.
Explain with diagram
Q. Give alongside is the diagram of an experimental set-up:
Q 1. What would you observe in the experiment after an hour or so?
Q 2. What control experiment can be set up for comparison?
Q 3. Keeping in mind the root hair,cell and its surroundings name the parts that correspond to I) concentrated sugar solution,II) parchment paper and III) water in beaker
Q3. Fill in the blanks with the appropriate answer from the choices given in the brackets.
(a) The site of light reaction in the cells of a leaf is ......................(cytoplasm, stroma, grana).
(b) The chemical substance used to test the presence of starch in the cell of a leaf is ............... (CaCl2), iodine solution , Benedict solution).
(c) Stroma is the ground substance in ................... (cytoplasm, chloroplast, ribosomes ).
(d) The dark reaction of photosynthesis is known as .................... (Hill reaction, cyclic phosphorylation, Calvin cycle ).
(e) In the flowering plants, food is transported in the form of ...................... (sucrose, glucose , starch).
8. Condition of a cells placed in Hypotonic solution.
9. The Pressure exerted by the cell content on plant cell wall.
10. Movement of water out of the cell when it is kept in hypotonic solution.
11. The Tissue which conduct manufacture of food in plants
12. A Solution whose concentration is equal to the cell sap.
Mention whether the following statements are True (T) or False (F)
i. A plant cell placed in hypotonic solution gets plasmolysed. (T/F)
ii. Addition of salt to pickles prevents growth of bacteria because they turn turgid. (T/F)
iv. Xylem is the water conducting tissue in plants. (T/F)
v. The shrinkage of protoplasm, when a cell is kept in hypotonic solution. (T/F)
vi. The cell wall of the root cell is a differentially permeable membrane. (T/F)
5. 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 questions that follow:
(a) Name the colour of dry cobalt chloride paper.
(b) Is the experimental leaf a monocot or a dicot? Give a reason to support your answer
1. Can you replace the twig of the plant with a small uprooted plant?
2) what is the purpose of putting oil in the test tube.
3) what is the purpose of the spring balance in the set up.
4) would it make a difference if the experimental set up is kept in bright sunlight.
Q. Given below is the representation of a certain phenomenon in nature with four organisms.
Name one natural element which all the organisms 2-4 and even 5 are getting from No. 1 for their survival.