What is a contractile vacuole? State its function in Amoeba.

List out five uses each of bacteria and fungi in our lives.

"Bacteria are harmful to human beings." Briefly explain this statement..

During a school trip to a hill station, students of class 7 walked past tall trees with needle-like leaves. They collected dry cones scattered beneath these trees. When Anunay gently shook one cone, tiny winged seeds slipped out. He noticed that the seeds were not enclosed in fruits but lay exposed on the scales of the cones.

(a) Do these trees belong to flowering plants ? If not, which group do they belong to ?

(b) Give two examples of plants that belong to the same category.

(c) These plants are evergreen. What does the term 'evergreen' mean ?

(d) Mention two types of cones commonly found on such trees.

(e) How are these cone-bearing plants different from fruit-bearing plants like mango or guava ?