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Zoology Question 42 – AP-EAMCET 2025

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It is not considered an alien species in India

An alien species (also known as an invasive species) is a species introduced outside its native range, which can cause harm to the environment, economy, or human health.

Step 1: Define Alien Species and Context✦ Active

An alien species, also known as an invasive species, is a non-native organism that is introduced to an ecosystem and causes or is likely to cause harm to the environment, economy, or human health. The question asks to identify which of the given options is *not* considered an alien species in India.

💡 Teacher's Secret Hint

Remember that a species can be invasive in one region but not necessarily in another. The context (India) is crucial here.

Step 2: Analyze Option 1: Lantana○ Expand

Lantana (Lantana camara) is a highly invasive shrub in India, known for forming dense thickets that suppress native vegetation and reduce biodiversity. It is definitely considered an alien species in India.

Step 3: Analyze Option 2: Nile Perch○ Expand

Nile Perch (Lates niloticus) is a large freshwater fish native to the Nile basin in Africa. While it is a notorious invasive species in Lake Victoria, causing significant ecological damage there, it is *not* widely recognized or listed as a major invasive species in India. Therefore, it is the most likely answer.

💡 Teacher's Secret Hint

Be careful not to confuse its invasive status in other parts of the world with its status in India.

Step 4: Analyze Option 3: Parthenium○ Expand

Parthenium (Parthenium hysterophorus), also known as carrot grass or congress grass, is one of the most aggressive and widespread invasive weeds in India, causing severe agricultural losses and health problems. It is definitely considered an alien species in India.

Step 5: Analyze Option 4: Eichhornia○ Expand

Eichhornia (Eichhornia crassipes), commonly known as water hyacinth, is considered one of the world's worst aquatic invasive weeds. It is highly prevalent in India, choking waterways and impacting aquatic biodiversity. It is definitely considered an alien species in India.

Step 6: Conclusion○ Expand

Based on the analysis, Lantana, Parthenium, and Eichhornia are all well-known invasive alien species in India. Nile Perch, while invasive elsewhere, is not typically classified as an alien species in India. Thus, Nile Perch is the correct answer.

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