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Test: Nutrition in Plants- 2 - UPSC MCQ


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10 Questions MCQ Test - Test: Nutrition in Plants- 2

Test: Nutrition in Plants- 2 for UPSC 2024 is part of UPSC preparation. The Test: Nutrition in Plants- 2 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Nutrition in Plants- 2 MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Nutrition in Plants- 2 below.
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Test: Nutrition in Plants- 2 - Question 1

Which of the following statements is true about photosynthesis?

Detailed Solution for Test: Nutrition in Plants- 2 - Question 1

During the process of photosynthesis, plants use sunlight to convert carbon dioxide and water into glucose (carbohydrate) and oxygen. The glucose produced is then stored in the form of starch. Therefore, during photosynthesis, oxygen is indeed released as a byproduct, and starch, which is a carbohydrate, is produced. The presence of starch in leaves indicates that photosynthesis has occurred.


     
Test: Nutrition in Plants- 2 - Question 2

What happens when an insect lands in a pitcher plant?

Detailed Solution for Test: Nutrition in Plants- 2 - Question 2

When an insect lands in a pitcher plant, the plant's lid closes, trapping the insect inside. The inner surface of the pitcher is lined with hair that further entangles the insect, preventing its escape. The plant then secretes digestive juices to break down the insect, and the nutrients from the insect are absorbed by the plant. This process is characteristic of insectivorous plants, which capture and digest insects to obtain essential nutrients. Thus, the correct answer is:

C) The pitcher plant’s lid closes, trapping the insect, which is then digested by digestive juices and absorbed for nutrients.

 

 

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Test: Nutrition in Plants- 2 - Question 3

What happens to nitrogen in the soil to make it usable for plants?

Detailed Solution for Test: Nutrition in Plants- 2 - Question 3
Nitrogen in the soil is converted into a usable, soluble form by bacteria, such as Rhizobium, which helps plants utilize nitrogen for growth.
Test: Nutrition in Plants- 2 - Question 4
What is the main function of the guard cells in leaves?
Detailed Solution for Test: Nutrition in Plants- 2 - Question 4
Guard cells surround the stomata and control their opening and closing, which regulates gas exchange and water loss in leaves.
Test: Nutrition in Plants- 2 - Question 5
What is the key difference between saprotrophs and parasites?
Detailed Solution for Test: Nutrition in Plants- 2 - Question 5
Saprotrophs, such as fungi, absorb nutrients from dead and decaying matter, while parasites depend on living hosts for their nutrition.
Test: Nutrition in Plants- 2 - Question 6

What are plants that have green stems called?

Detailed Solution for Test: Nutrition in Plants- 2 - Question 6

- Plants with green stems are typically called herbs.
- Herbs are small plants with soft, flexible stems that are green and usually lack woody tissue.
- These plants often have a shorter life cycle and are generally used for culinary or medicinal purposes.
- Unlike trees and shrubs, herbs do not develop thick, woody stems.
- Shrubs and trees have woody stems and are structurally different from herbs.
- Thus, the correct answer is A: Herbs.

Test: Nutrition in Plants- 2 - Question 7
Which part of the plant is known as the "food factory"?
Detailed Solution for Test: Nutrition in Plants- 2 - Question 7
Leaves are known as the food factory of plants because they contain chlorophyll and are the primary site of photosynthesis where food is synthesized.
Test: Nutrition in Plants- 2 - Question 8
Why are desert plants’ leaves often modified into spines?
Detailed Solution for Test: Nutrition in Plants- 2 - Question 8
Desert plants’ leaves are often modified into spines to reduce water loss through transpiration, helping them survive in arid conditions.
Test: Nutrition in Plants- 2 - Question 9
What is the primary purpose of adding fertilizers to soil?
Detailed Solution for Test: Nutrition in Plants- 2 - Question 9
Fertilizers are added to soil to provide essential nutrients like nitrogen, potassium, and phosphorus, which help in plant growth and soil fertility.
Test: Nutrition in Plants- 2 - Question 10
Why are nitrogen-fixing bacteria important for plants?
Detailed Solution for Test: Nutrition in Plants- 2 - Question 10
Nitrogen-fixing bacteria are crucial for plants because they convert atmospheric nitrogen into a form that plants can absorb and use. These bacteria, often found in the roots of legumes, provide plants with essential nitrogen that is needed for protein synthesis and overall growth, thus reducing the need for synthetic nitrogen fertilizers.
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