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
M.M: 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 describes the mode of nutrition in saprotrophs?
(i)They make their food using sunlight and carbon dioxide.
(ii)They obtain nutrients from dead and decaying organic matter.
(iii)They feed on other living organisms.
(iv)They trap insects and digest them for nutrients.
Q2: Fill in the blank: Plants that synthesise their own food are called _________. (1 Mark)
Q3: Match the following:
Q4: Cuscuta, Mushroom, Rose plant, Pitcher plant – which one is the odd one out and why?
Q5: True or False: Symbiosis is a relationship where two organisms live together and both benefit from each other. (1 Mark)
Q6: Why do plants need nitrogen, and how do they obtain it? (2 Marks)
Q7: How does the pitcher plant obtain nutrients? (2 Marks)
Q8: How do algae prepare their food, and why are they green? (2 Marks)
Q9: How would you test the presence of starch in leaves? (3 Marks)
Q10: Differentiate between autotrophic and heterotrophic nutrition in plants. (3 Marks)
Q11: What are the roles of guard cells in the process of photosynthesis, and how do they help in regulating the exchange of gases and water loss in plants? (3 Marks)
Q12: Describe the process of photosynthesis in green plants and explain its significance.(5 Marks)
Q13: Explain the role of Rhizobium bacteria in replenishing soil nutrients. (5 Marks)
You can find the solutions of this Unit Test here: Unit Test (Solution): Nutrition in Plants
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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 in the form of glucose. This occurs mainly in the chloroplasts of plant cells, where chlorophyll captures sunlight. The process involves taking in carbon dioxide from the air and water from the soil, which, in the presence of sunlight, are converted into glucose and oxygen.
| 2. Why do plants need nutrients? | |
Ans.Plants require nutrients to grow, develop, and carry out essential life processes. Nutrients play a critical role in various functions, including photosynthesis, energy transfer, and the synthesis of proteins and nucleic acids. Key nutrients such as nitrogen, phosphorus, and potassium are vital for healthy plant growth.
| 3. What are the different types of nutrients that plants need? | |
Ans.Plants need two main types of nutrients: macronutrients and micronutrients. Macronutrients include nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur, which are required in larger quantities. Micronutrients, such as iron, manganese, zinc, copper, molybdenum, and boron, are needed in smaller amounts but are equally important for various physiological functions.
| 4. How do plants absorb nutrients from the soil? | |
Ans.Plants absorb nutrients from the soil primarily through their root systems. The roots take up water and dissolved minerals through a process called diffusion and active transport. The presence of root hairs increases the surface area for absorption, allowing plants to efficiently acquire necessary nutrients from the soil.
| 5. What impact does soil quality have on plant nutrition? | |
Ans.Soil quality significantly affects plant nutrition as it determines the availability of essential nutrients, water retention, and overall soil health. Healthy soil is rich in organic matter and has a balanced pH, which helps in nutrient solubility. Poor soil quality can lead to nutrient deficiencies, impacting plant growth and productivity.
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