Photosynthesis Class 10 Concise Short Ans Type ICSE Biology Selina Solutions Ch-6. In this article you will get the solutions of Short Answer Type Questions as council latest syllabus. Visit official website CISCE for detail information about ICSE Board Class-10 Biology.
Photosynthesis Class 10 Concise Short Ans Type ICSE Biology Selina Solutions Ch-6
| Board | ICSE |
| Subject | Biology |
| Class | 10 |
| Book | Selina Concise |
| Chapter-6 | Photosynthesis |
| Topics | Short Answer Type Questions |
| Session | 2024-25 |
Short Answer Type Questions on Photosynthesis
(Class 10 Concise ICSE Biology Selina Solutions Ch-6)
Que-1: Identify the false statements and rewrite them correctly by changing the first or last word only.
(a) Dark reaction of photosynthesis occurs during night time.
(b) Photosynthesis requires enzymes.
(c) Green plants are consumers.
(d) Photosynthesis results in loss of dry weight of the plants.
(e) Photosynthesis stops at a temperature of about 35°C.
(f) Photosynthesis occurs only in cells containing chloroplasts.
(g) Green plants perform photosynthesis.
(h) Algae are autotrophs.
Sol:
(a) False, Corrected statement — Dark reaction of photosynthesis occurs simultaneously with light reaction.
(b) True
(c) False, Corrected statement — Green plants are producers.
(d) False, Corrected statement — Respiration results in loss of dry weight of the plants.
(e) False, Corrected statement — Photosynthesis stops at a temperature of about 40°C.
(f) True
(g) True
(h) True
Que-2: 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).
Sol:
(a) The site of light reaction in the cells of a leaf is …grana.…
(b) The chemical substance used to test the presence of starch in the cell of a leaf is …. iodine solution…
(c) Stroma is the ground substance in .… chloroplast….
(d) The dark reaction of photosynthesis is known as … Calvin cycle ….
(e) In the flowering plants, food is transported in the form of ... Sucrose...
Que-3: 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 photosynthesize in bright sunshine.
(d) Destarching of the leaves of a potted plant can occur only at night.
(e) If a plant is kept in bright light all the 24 hours for a few days, the dark reaction (biosynthetic phase) will fail to occur.
(f) Photosynthesis is considered as a process supporting all life on earth.
Sol:
(a) False, Corrected statement — Photosynthesis increases with the light intensity up to a certain limit only, and then it gets stabilized at the point S'(0.02% CO2).
(b) False, Corrected statement — The atmospheric temperature is an important external factor affecting photosynthesis. With the rise in temperature, the rate of photosynthesis rises. This rise occurs up to the optimum temperature of 35°C (maximum suitable temperature when the photosynthesis occurs best) after which the rate falls and stops above 40°C.
(c) False, Corrected statement — Ice cold water will hamper the process of photosynthesis in the immersed leaf, even if there is sufficient sunshine because the temperature is an important factor for the rate of photosynthesis.
(d) False, Corrected statement — For de-starching, the potted plant can be kept in a dark room for 24-48 hours. During this period, all the starch will be removed from the leaves and stored in the storage organs.
(e) False, Corrected statement — If a plant is kept in bright light all the 24 hours for a few days, the dark reaction (biosynthetic phase) will continue to occur because the dark reaction is independent of light and it occurs simultaneously with the light dependent reaction.
(f) True
Que-4: Given below are five terms. Rewrite the terms in the correct order so as to be in logical sequence with regard to photosynthesis: (i) water molecules, (ii) oxygen, (iii) grana, (iv) hydrogen and hydroxyl ions, (v) photons.
Sol: Photons, grana, water molecules, hydrogen and hydroxyl ions, oxygen
Que-5: State any four differences between photosynthesis and respiration
Sol:
| Photosynthesis | Respiration |
|---|---|
| Photosynthesis utilizes carbon dioxide and water in the presence of light to produce glucose and oxygen. | Respiration uses oxygen and glucose to power the activities of the cell. |
| Photosynthesis results in gain of dry weight of the plants. | Respiration results in loss of dry weight of the plants. |
| The raw materials for the photosynthesis are water, carbon dioxide and sunlight. | The raw material for respiration is glucose. |
| Photosynthesis occurs in plants and some photosynthetic bacteria. | Respiration occurs in all living organisms |
Que-6: Complete the following food chains by writing the names of appropriate organisms in the blanks
(i) Grass → …………… → Snake → ……. (ii) …………… → Mouse …………… → Peacock
Sol: (i) Grass → Grasshopper → Snake → Hawk, (ii) Corn → Mouse → Snake → Peacock
Que-7: Name these
(a) Two aquatic plants which can be used for the experiment of photosynthesis.
(b) Two plants having variegated leaves.
(c) Two raw materials for photosynthesis.
(d) Four essentials for photosynthesis.
(e) Two main phases of photosynthesis.
Sol:
(a) Hydrilla, Elodea
(b) Geranium, Croton
(c) Carbon dioxide, water
(d) Light, Chlorophyll, Carbon dioxide and water
(e) Photo-chemical phase, Biosynthetic phase
Que-8: Match the terms given in column A with column B
| Column A | Column B |
|---|---|
| Chlorophyll | Removes/absorbs CO2 |
| Methylated spirit | Tests presence of starch |
| Potassium hydroxide | Traps solar energy |
| Iodine solution | Produces oxygen |
| Water | Bleaches chlorophyll |
Sol:
| Column A | Column B |
|---|---|
| Chlorophyll | Traps solar energy |
| Methylated spirit | Bleaches chlorophyll |
| Potassium hydroxide | Removes/absorbs CO2 |
| Iodine solution | Tests presence of starch |
| Water | Produces oxygen |
Que-9: Complete the following by filling the blanks 1 to 5 with appropriate words/ terms/ phrases:
To test the leaf for starch, the leaf is boiled in water to (1) …………… . It is next boiled in methylated spirit to (2) …………… . The leaf is placed in warm water to soften it. It is then placed in a dish and (3) …………… solution is added. The region, which contains starch, turns (4) …………… and the region, which does not contain starch, turns (5) …………… .
Sol: To test the leaf for starch, the leaf is boiled in water to (1) kill the cells. It is next boiled in methylated spirit to (2) remove chlorophyll. The leaf is placed in warm water to soften it. It is then placed in a dish and (3) iodine solution is added. The region, which contains starch, turns (4) blue-black and the region, which does not contain starch, turns (5) brown..
Que-10: Write the exact location of each :
(a) Chlorophyll
(b) Chloroplast in the parts of a plant
(c) Stroma
(d) Guard cells
(e) Palisade cells
Sol:
(a) Wall of thylakoid.
(b) Mesophyll cells of upper and lower epidermis of leaves.
(c) Chloroplast.
(d) Stomata.
(e) Beneath epidermis.
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