Class 7 Exam > Class 7 Notes > Science Class 7 (Old NCERT) > Unit Test: Nutrition in Plants
Unit Test: Nutrition in Plants | Science Class 7 (Old NCERT) 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 numbers 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
Q2: What is the role of chlorophyll in photosynthesis? (1 Mark)
Q3: Name the tiny openings on leaves through which carbon dioxide enters the plant. (1 Mark)
Q4: Which of the following is a parasitic plant? (1 Mark)
(a) Mushroom
(b) Cuscuta
(c) Pitcher plant
(d) Pea plant
Q5: What is the main function of Rhizobium bacteria in leguminous plants? (1 Mark)
Q6: Write the equation for photosynthesis and explain its importance. (2 marks)
Q7: How do insectivorous plants obtain nutrients, and why do they trap insects? (2 marks)
Q8: Differentiate between autotrophic and heterotrophic nutrition with one example each. (2 marks)
Q9: Explain how soil nutrients are replenished naturally and artificially. (3 marks)
Q10: Why do saprotrophic organisms grow in damp and warm conditions? Give one example. (3 marks)
Q11: How does a symbiotic relationship work in lichens? (3 marks)
Q12: Explain the role of stomata in photosynthesis. What happens when stomata remain open for a long time? (5 marks)
Q13: Describe the process by which plants obtain nitrogen for protein synthesis. (5 marks)
The document Unit Test: Nutrition in Plants | Science Class 7 (Old NCERT) is a part of the Class 7 Course Science Class 7 (Old NCERT).
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FAQs on Unit Test: Nutrition in Plants - Science Class 7 (Old NCERT)
| 1. What is the process of photosynthesis in plants? |  |
Ans.Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy. It occurs primarily in the chloroplasts of plant cells, where chlorophyll absorbs sunlight. During photosynthesis, plants take in carbon dioxide from the air and water from the soil, using them to produce glucose and oxygen. The overall equation for photosynthesis can be summarized as: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂.
| 2. Why are plants considered autotrophs? | |
Ans.Plants are considered autotrophs because they can produce their own food through the process of photosynthesis. Unlike heterotrophs, which rely on consuming other organisms for energy, autotrophs utilize inorganic substances and sunlight to create organic compounds, primarily glucose. This ability enables plants to sustain themselves and serve as a primary energy source for other organisms in the food chain.
| 3. What are the different types of nutrition in plants? | |
Ans.Plants exhibit mainly two types of nutrition: autotrophic and heterotrophic. Autotrophic nutrition, as previously mentioned, involves the synthesis of food using sunlight, water, and carbon dioxide. Heterotrophic nutrition, on the other hand, involves organisms that depend on other sources for food. Some plants, like carnivorous plants, exhibit heterotrophic nutrition by trapping and digesting insects to supplement their nutrient intake, particularly in nutrient-poor environments.
| 4. How do plants absorb nutrients from the soil? | |
Ans.Plants absorb nutrients from the soil primarily through their root systems. The roots have tiny hair-like structures called root hairs that increase surface area for absorption. Nutrients are taken up through a process called active transport, where plants use energy to move minerals from the soil into their cells. Additionally, water is absorbed through osmosis, which helps dissolve nutrients and facilitates their movement within the plant.
| 5. What role do chlorophyll and sunlight play in plant nutrition? | |
Ans.Chlorophyll is a green pigment found in the chloroplasts of plant cells that plays a crucial role in photosynthesis. It absorbs light energy, primarily from the blue and red wavelengths, and converts it into chemical energy. Sunlight provides the energy required for the photosynthetic process, allowing plants to convert carbon dioxide and water into glucose and oxygen. Without chlorophyll and sunlight, plants would be unable to produce their own food and sustain their growth.
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