Why some plants of cycas produce seeds but not others ?

some plants of cycas produces seeds, but not others. justify

(a) How are Parthenocarpic fruits produced by some plants and apomictic seeds by some others ? Explain. (b) When do farmers prefer using apomictic seeds ?

(a) How are Parthenocarpic fruits produced by some plants and apomictic seeds by some others ? Explain. (b) When do farmers prefer using apomictic seeds ?

Which of the following plants produces seeds but not flowers : -

Which of the following plants produces seeds but not flowers : -

Which of the following plants produces seeds but not flowers : -

Which of the following plants produces seeds but not true flowers ?

Name the group of plants which produce seeds but not fruits.