Chapter 6: Principles of Ecology — Online MCQ Test
BOTANY · CLASS 12th · Tamil Nadu State Board
Practice Chapter 6: Principles of Ecology with a free chapter-wise online MCQ test.
This chapter covers: Exploring ecological concepts this chapter examines autecology synecology and ecological adaptations in plants. Students study environmental factors like temperature light water an....
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Chapter 6: Principles of Ecology — Important Questions & Answers
The study of reciprocal relationship between every single species and its environment is called:
- A. Synecology
- B. Autecology
- C. Palaeoecology
- D. Genecology
Answer: B. Autecology
Autecology is the study of the ecology of an individual species or its population, whereas synecology is the study of communities.
Autecology is the study of the ecology of an individual species or its population, whereas synecology is the study of communities.
Epiphytes like Vanda possess a special multi-layered hygroscopic epidermis to absorb moisture from the atmosphere. What is this tissue called?
- A. Pneumatophore
- B. Velamen
- C. Parenchyma
- D. Aerenchyma
Answer: B. Velamen
Velamen is a specialized hygroscopic tissue found in the aerial roots of epiphytic orchids like Vanda that helps in absorbing atmospheric moisture.
Velamen is a specialized hygroscopic tissue found in the aerial roots of epiphytic orchids like Vanda that helps in absorbing atmospheric moisture.
Identify the correct pair of plants that show 'Cladode' (a modified stem of limited growth) and 'Phylloclade' (green, flat stem of unlimited growth) respectively.
- A. Opuntia and Casuarina
- B. Asparagus and Opuntia
- C. Ruscus and Euphorbia
- D. Euphorbia and Asparagus
Answer: B. Asparagus and Opuntia
In Asparagus, the stem is modified into cladodes of limited growth, while Opuntia possesses a phylloclade which is a succulent green stem with unlimited growth.
In Asparagus, the stem is modified into cladodes of limited growth, while Opuntia possesses a phylloclade which is a succulent green stem with unlimited growth.
An orchid seed is extremely small and light, containing almost no food reserves. During germination, it must establish an association with a fungus (Mycorrhiza) to obtain nutrients. This association represents which type of interaction?
- A. Commensalism, because only the orchid benefits
- B. Mutualism, because both orchid and fungus exchange nutrients and sustain growth
- C. Parasitism, because the orchid robs the fungus of carbon sources
- D. Amensalism, because the fungus is harmed by the orchid's growth
Answer: B. Mutualism, because both orchid and fungus exchange nutrients and sustain growth
Mycorrhizal association is a classic example of mutualism where both organisms benefit; the plant gets inorganic nutrients and water while the fungus gets organic food.
Mycorrhizal association is a classic example of mutualism where both organisms benefit; the plant gets inorganic nutrients and water while the fungus gets organic food.
Plants that grow specifically in the narrow crevices of rocks are referred to as:
- A. Lithophytes
- B. Chasmophytes
- C. Psammophytes
- D. Calcifuges
Answer: B. Chasmophytes
Lithophytes grow on the surface of rocks, whereas plants that specifically grow inside rock crevices where small amounts of organic soil accumulate are termed Chasmophytes.
Lithophytes grow on the surface of rocks, whereas plants that specifically grow inside rock crevices where small amounts of organic soil accumulate are termed Chasmophytes.