Which of the following statements are correct ?
A. The Amazon rainforest being cut and cleared for cultivation of soyabeans is an example of habitat loss.
B. Steller's sea cow and passenger pigeon became extinct due to over-exploitation by humans.
C. The Nile perch introduced into Lake Victoria in East Africa lead to population growth of cichlid fish in the lake.
D. Water hyacinth is an invasive species.
E. When a species becomes extinct, the plant and animal species associated with it are not affected.
Choose the correct answer from the options given below :

(B) A, B and D only
Statement A is correct. The Amazon rainforest is being cut and cleared for cultivating soyabeans or for conversion to grasslands for raising beef cattle, which is a major example of habitat loss.
Statement B is correct. Steller's sea cow and the passenger pigeon became extinct in the last 500 years due to over-exploitation by humans
Statement C is incorrect. The introduction of the Nile perch into Lake Victoria in East Africa led to the extinction of more than 200 species of cichlid fish, not their population growth.
Statement D is correct. Water hyacinth (Eichhornia) is an invasive weed species that poses a major threat to native species and aquatic ecosystems.
Statement E is incorrect. When a species becomes extinct, the plant and animal species associated with it in an obligatory way also become extinct. This phenomenon is known as co-extinction.
Therefore, only statements A, B, and D are correct.