Stars and the solar system. — Science STD 8 — Question

Name two crops which are cultivated:

1. By sowing seeds directly into fields.
2. By transplanting.

What happens when the two plates of earth's crust moving in opposite directions slide past one another?

What is an endocrine gland? Name two endocrine glands.

Name the forces acting on a plastic bucket containing water held above ground level in your hand. Discuss why the forces acting on the bucket do not bring a change in its state of motion.

Can the process of rusting be called combustion? Give reason for your answer.

Which force keeps the members of the Solar System bound to the Sun?

What are weeds? Name any one weed found in a crop field.

Which of the following organisms reproduces by sexual and which by asexual method?
Amoeba, Cats Humans, Hydra, Birds.

Name one hormone secreted by pituitary gland. State the function of this hormone.

Name the unit which is used to express distances between the various celestial bodies (like stars and planets).