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Test: Plant Morphology - SSC CGL MCQ


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10 Questions MCQ Test SSC CGL Tier 2 - Study Material, Online Tests, Previous Year - Test: Plant Morphology

Test: Plant Morphology for SSC CGL 2024 is part of SSC CGL Tier 2 - Study Material, Online Tests, Previous Year preparation. The Test: Plant Morphology questions and answers have been prepared according to the SSC CGL exam syllabus.The Test: Plant Morphology MCQs are made for SSC CGL 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Plant Morphology below.
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Test: Plant Morphology - Question 1

What is the primary characteristic that distinguishes taproot systems from fibrous root systems?

Detailed Solution for Test: Plant Morphology - Question 1
The key feature distinguishing taproot systems, as observed in dicots like gram and mustard, from fibrous root systems in monocotyledons such as rice and wheat is the origin of the primary root during germination. In taproot systems, the primary root results from the elongation of the radicle, providing stability and branching into secondary and tertiary roots. In contrast, fibrous root systems have multiple roots originating from the base of the stem. Understanding this distinction is crucial for identifying plant adaptations to their environment.
Test: Plant Morphology - Question 2

Which stem modification serves the function of climbing, providing mechanical support to the plant?

Detailed Solution for Test: Plant Morphology - Question 2
Stem tendrils, such as those found in grapes, cucumber, and pumpkin, are coiled structures that serve the function of climbing. These specialized structures provide mechanical support to the tender stem, enabling plants to ascend and access sunlight efficiently. This adaptation showcases the diverse ways in which plants modify their stems to thrive in various ecological niches.
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Test: Plant Morphology - Question 3

In xerophytic plants, what significant adaptation is observed in aerial stems to minimize water loss?

Detailed Solution for Test: Plant Morphology - Question 3
Xerophytic plants, adapted to arid environments, demonstrate aerial modifications in their stems. For instance, phylloclades in species like Euphorbia and Opuntia undergo complete metamorphosis, becoming fleshy and green. This adaptation helps in photosynthesis, compensating for reduced or thorn-like leaves that minimize water loss via transpiration. Understanding these modifications provides insights into how plants thrive in challenging conditions.
Test: Plant Morphology - Question 4
What type of leaves do plants like peas exhibit, which are modified to form long thread-like structures for climbing?
Detailed Solution for Test: Plant Morphology - Question 4
Plants like peas exhibit tendrils, which are leaves modified to form long thread-like structures. These tendrils play a crucial role in providing support for climbing. Understanding leaf modifications helps in recognizing the diverse strategies employed by plants for adaptation and ecological success.
Test: Plant Morphology - Question 5
Which special inflorescence type involves an involucre of bracts forming a cup-shaped structure?
Detailed Solution for Test: Plant Morphology - Question 5
Cyathium is a special inflorescence type characterized by an involucre of bracts forming a cup-shaped structure. This arrangement is found in the Euphorbia genus, where a single female flower is surrounded by numerous male flowers. Recognizing these unique inflorescence types contributes to a deeper understanding of plant diversity.
Test: Plant Morphology - Question 6
What floral symmetry is exhibited when a flower can be divided into two equal parts in only one vertical plane?
Detailed Solution for Test: Plant Morphology - Question 6
Zygomorphic floral symmetry occurs when a flower can be divided into two equal parts in only one vertical plane. This is in contrast to actinomorphic symmetry, where flowers are radially symmetrical. Understanding floral symmetry is crucial for accurate plant identification and classification.
Test: Plant Morphology - Question 7
In which type of flowers are sepals or petals united in a whorl?
Detailed Solution for Test: Plant Morphology - Question 7
Gamopetalous refers to flowers where sepals or petals are united in a whorl. This characteristic is in contrast to polysepalous and polypetalous flowers, where sepals or petals, respectively, are free. Understanding floral aesthetics provides insights into the diverse ways in which flowers develop and protect their reproductive organs.
Test: Plant Morphology - Question 8
What is the specific arrangement of ovules in the ovary called?
Detailed Solution for Test: Plant Morphology - Question 8
The specific arrangement of ovules in the ovary is termed placentation. This arrangement, such as marginal, axile, parietal, free central, or basal, is crucial for seed development and influences the structure of the fruit. Understanding placentation provides insights into the reproductive strategies of flowering plants.
Test: Plant Morphology - Question 9
What is the primary function of pneumatophores in mangroves?
Detailed Solution for Test: Plant Morphology - Question 9
Pneumatophores, observed in mangroves, serve the primary function of facilitating respiration. Growing upwards above the ground in swampy areas, these roots enable efficient gas exchange, allowing mangroves to thrive in oxygen-deficient environments. Recognizing such adaptations highlights the intricate ways in which plants overcome environmental challenges.
Test: Plant Morphology - Question 10
What is the main characteristic of racemose inflorescence?
Detailed Solution for Test: Plant Morphology - Question 10
Racemose inflorescence is characterized by the main axis that grows indefinitely. This type of inflorescence features flowers arranged laterally in acropetal succession, where older flowers are at the bottom and younger ones are at the top. Understanding the arrangement and growth pattern of racemose inflorescence aids in the identification and classification of different plant species.
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