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Test: Nutrition in Plants- 1 - UPSC MCQ


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10 Questions MCQ Test Science & Technology for UPSC CSE - Test: Nutrition in Plants- 1

Test: Nutrition in Plants- 1 for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The Test: Nutrition in Plants- 1 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Nutrition in Plants- 1 MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Nutrition in Plants- 1 below.
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Test: Nutrition in Plants- 1 - Question 1

What is the primary mode of nutrition for plants?

Detailed Solution for Test: Nutrition in Plants- 1 - Question 1
The primary mode of nutrition for plants is autotrophic nutrition, where they synthesize their own food using sunlight, carbon dioxide, and water. This process, known as photosynthesis, occurs mainly in the leaves of plants due to the presence of chlorophyll. An interesting fact is that photosynthesis not only produces food but also releases oxygen, which is essential for the survival of most living organisms on Earth.
Test: Nutrition in Plants- 1 - Question 2

Which pigment in the leaves is responsible for capturing sunlight?

Detailed Solution for Test: Nutrition in Plants- 1 - Question 2
Chlorophyll is the green pigment in the leaves responsible for capturing sunlight, which is crucial for photosynthesis. Chlorophyll absorbs light most efficiently in the blue and red wavelengths, while reflecting green light, which is why plants appear green. An additional interesting fact is that chlorophyll is structurally similar to hemoglobin in blood, but instead of iron, it has magnesium at its core.
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Test: Nutrition in Plants- 1 - Question 3

What do you call the plants that derive nutrients from dead and decaying matter?

Detailed Solution for Test: Nutrition in Plants- 1 - Question 3
Plants that derive nutrients from dead and decaying matter are called saprotrophs. They secrete digestive enzymes onto the decaying material to break it down and absorb the nutrients. Fungi, such as mushrooms and molds, are common examples of saprotrophs. An interesting fact is that saprotrophs play a crucial role in ecosystems by recycling nutrients back into the soil, supporting plant growth.
Test: Nutrition in Plants- 1 - Question 4
What structure in leaves allows the exchange of gases?
Detailed Solution for Test: Nutrition in Plants- 1 - Question 4
Stomata are tiny pores located on the surface of leaves that allow the exchange of gases, including the intake of carbon dioxide and release of oxygen during photosynthesis. Each stoma is surrounded by guard cells that regulate its opening and closing. An interesting fact is that the number of stomata can vary greatly between different plant species and environmental conditions, helping plants adapt to their surroundings.
Test: Nutrition in Plants- 1 - Question 5
What type of relationship exists between fungi and algae in lichens?
Detailed Solution for Test: Nutrition in Plants- 1 - Question 5
In lichens, fungi and algae live in a symbiotic relationship where the fungi provide shelter and minerals, while the algae perform photosynthesis and provide food.
Test: Nutrition in Plants- 1 - Question 6
Which of the following is an example of a saprotroph?
Detailed Solution for Test: Nutrition in Plants- 1 - Question 6
Fungi are saprotrophs, meaning they obtain nutrients by decomposing dead and decaying organic matter, playing a crucial role in nutrient cycling.
Test: Nutrition in Plants- 1 - Question 7
What is the primary function of chlorophyll in the process of photosynthesis?
Detailed Solution for Test: Nutrition in Plants- 1 - Question 7
Chlorophyll's main role in photosynthesis is to capture the solar energy, which is then used to convert carbon dioxide and water into carbohydrates. This process is crucial for the synthesis of food in plants.
Test: Nutrition in Plants- 1 - Question 8
Which of the following is NOT a raw material required for photosynthesis?
Detailed Solution for Test: Nutrition in Plants- 1 - Question 8
Photosynthesis requires carbon dioxide, water, and sunlight to produce carbohydrates and oxygen. Oxygen is a byproduct, not a raw material.
Test: Nutrition in Plants- 1 - Question 9
What are plants that depend on other plants for food called?
Detailed Solution for Test: Nutrition in Plants- 1 - Question 9
Plants that depend on other plants for food are called parasites. They extract nutrients from their host plant, often harming it in the process.
Test: Nutrition in Plants- 1 - Question 10
What substance is commonly used to test for the presence of starch in leaves?
Detailed Solution for Test: Nutrition in Plants- 1 - Question 10
Iodine solution is used to test for the presence of starch. When applied to a leaf, it turns blue-black if starch is present, indicating that photosynthesis has occurred.
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