Agatha asked in Science

Pls help with question a and b

Thank You

Alisha Guglani answered this

Dear student 

Please find your answer below to the asked query:

(a)  Weeds compete with the rice plants for water and available nutrients which reduce the yield of the crop.
Sow hen weeds were removed then yield of rice plant should have increased.

(b) Fishes  might be depending on weeds for their survival as fishes use to eat weeds . So when weeds removed, fishes didn't get food and their number decreased significantly.
Similarly fully submerged plants are ecologically dependent on weeds,so they are also affected.