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Class 7 Exam > Class 7 Notes > Science Class 7 > Unit Test (Solutions): Nutrition in Plants
Unit Test (Solutions): Nutrition in Plants | Science Class 7 PDF Download
Time: 1 hour
Maximum Marks: 30
Attempt all questions.
- Question numbers 1 to 5 carry 1 mark each.
- Question numbers 6 to 8 carry 2 marks each.
- Question numbers 9 to 11 carry 3 marks each.
- Question number 12 & 13 carry 5 marks each.
Q1: Which of the following is an autotrophic mode of nutrition? (1 Mark)
(a) Parasitic nutrition
(b) Heterotrophic nutrition
(c) Saprotrophic nutrition
(d) Photosynthetic nutrition
Ans: (d) Photosynthetic nutrition
Through photosynthesis, plants prepare their food using sunlight, carbon dioxide, and water.
Q2: What is the role of chlorophyll in photosynthesis? (1 Mark)
Ans: Chlorophyll is a green pigment in plant leaves that captures sunlight and helps convert carbon dioxide and water into carbohydrates.
Q3: Name the tiny openings on leaves through which carbon dioxide enters the plant. (1 Mark)
Ans: Stomata
Q4: Which of the following is a parasitic plant? (1 Mark)
(a) Mushroom
(b) Cuscuta
(c) Pitcher plant
(d) Pea plant
Ans: (b) Cuscuta
Cuscuta is a parasitic plant that derives nutrients from a host plant.
Q5: What is the main function of Rhizobium bacteria in leguminous plants? (1 Mark)
Ans: Rhizobium bacteria help in nitrogen fixation by converting atmospheric nitrogen into a usable form for plants.
Q6: Write the equation for photosynthesis and explain its importance. (2 Marks)
Ans:
Equation:
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ (in the presence of sunlight and chlorophyll)
Photosynthesis is important as it provides food and oxygen, which are essential for the survival of living organisms.
Q7: How do insectivorous plants obtain nutrients, and why do they trap insects? (2 Marks)
Ans: Insectivorous plants, like the pitcher plant, trap and digest insects to obtain essential nutrients, particularly nitrogen, as they grow in soil deficient in nitrogen.
Q8: Differentiate between autotrophic and heterotrophic nutrition with one example each. (2 Marks)
Ans:
- Autotrophic nutrition: Organisms prepare their own food (e.g., green plants).
- Heterotrophic nutrition: Organisms depend on other organisms for food (e.g., animals, fungi).
Q9: Explain how soil nutrients are replenished naturally and artificially. (3 Marks)
Ans:
- Naturally: Rhizobium bacteria in leguminous plants fix nitrogen. Decomposed organic matter enriches the soil.
- Artificially: Farmers use fertilizers and manure to restore nutrients like nitrogen, phosphorus, and potassium in the soil.
Q10: Why do saprotrophic organisms grow in damp and warm conditions? Give one example. (3 Marks)
Ans: Saprotrophic organisms, such as fungi, require moisture and warmth for their spores to germinate. For example, mushrooms grow in damp and decaying matter.
Q11: How does a symbiotic relationship work in lichens? (3 Marks)
Ans: Lichens are formed by a mutualistic association between algae and fungi. The algae perform photosynthesis and provide food, while the fungi offer water and protection.
Q12: Explain the role of stomata in photosynthesis. What happens when stomata remain open for a long time? (5 Marks)
Ans:
- Role in Photosynthesis: Stomata are tiny openings in leaves that allow the exchange of gases. They take in carbon dioxide needed for photosynthesis and release oxygen.
- Effect of Staying Open: If stomata remain open for too long, excessive water loss occurs through transpiration, leading to dehydration in plants.
Q13: Describe the process by which plants obtain nitrogen for protein synthesis. (5 Marks)
Ans:
- Plants need nitrogen to produce proteins.
- Atmospheric nitrogen is unavailable in its gaseous form.
- Rhizobium bacteria in the roots of leguminous plants convert nitrogen into a usable form.
- Farmers add nitrogen-rich fertilizers to enhance soil fertility.
- Once nitrogen is absorbed by plant roots, it is used to form proteins and vitamins.
The document Unit Test (Solutions): Nutrition in Plants | Science Class 7 is a part of the Class 7 Course Science Class 7.
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FAQs on Unit Test (Solutions): Nutrition in Plants - Science Class 7
| 1. What are the main modes of nutrition in plants? |  |
| 2. How do plants perform photosynthesis? | |
Ans. Plants perform photosynthesis primarily in their leaves, where chlorophyll, a green pigment, captures sunlight. This energy is used to convert carbon dioxide (absorbed from the air) and water (taken up from the soil) into glucose (a sugar) and oxygen. The overall chemical reaction can be summarized as: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. This process not only provides energy for the plant but also releases oxygen into the atmosphere, which is essential for most living organisms.
| 3. What is the role of chlorophyll in plant nutrition? | |
Ans. Chlorophyll plays a crucial role in plant nutrition as it is the pigment responsible for absorbing light energy during the process of photosynthesis. It primarily absorbs light in the blue and red wavelengths and reflects green light, which is why plants appear green. The absorbed light energy is then converted into chemical energy that drives the synthesis of glucose, enabling the plant to produce its own food.
| 4. Can plants be heterotrophic? If so, how? | |
Ans. Yes, some plants can be heterotrophic. These plants, known as heterotrophic plants, cannot perform photosynthesis and instead obtain their nutrients by consuming other organisms or organic matter. Examples include carnivorous plants like the Venus flytrap, which trap and digest insects for nutrients, and parasitic plants like mistletoe, which extract water and nutrients from their host plants.
| 5. What are the benefits of understanding plant nutrition? | |
Ans. Understanding plant nutrition is essential for several reasons. It helps in optimizing agricultural practices to enhance crop yield and quality, informs sustainable farming methods, and helps in the conservation of plant species. Additionally, knowledge of plant nutrition can contribute to ecological balance, improve food security, and guide efforts in addressing issues like soil degradation and nutrient depletion.
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