What is the contribution of tree roots in conservation?

Correct answer: They bind soil and reduce erosion

The direct answer is B: tree roots bind the soil and reduce erosion. Roots spread through the ground like a natural net. When rain falls, this net holds soil particles, so water cannot easily carry them away. Roots also slow the movement of water through the soil and help the soil absorb more water. Therefore, vegetation is an important means of soil conservation. Option A is wrong because roots generally strengthen and hold soil rather than weaken it. Option B is correct because binding soil directly reduces removal of the fertile top layer. Option C is wrong because roots do not always drive wildlife away; plants may provide food and shelter for animals. Option D is wrong because trees cannot completely stop rainfall; they may intercept some rain and influence water movement, but rain still occurs. Remember: roots act like an underground net against erosion.