How do Organisms Reproduce? — Science STD 10 — Question

Which of the following statements are true?

1. Sudden action in response to something in the environment is called reflex action.
2. Sensory neurons carry electrical signals from spinal cord to muscles in a reflex action.
3. Motor neurons carry signals from receptors to spinal cord in a reflex action.
4. The pathway of transmitting signals from a receptor to a muscle is a reflex action.

Which one of the following four metals would be displaced from the solution of its salts by other three metals?

Which of the following is not a natural resource?

An object is place placed at a distance of half the focal length of a convex lens. The Image will be :

Which of the following equation is not correct?

Reaction which has equal number of atoms of all the elements on both sides of a chemical equation is called

Example of positive geotropism is :

When ethanol is heated with alkaline potassium permanganate solution, it gets converted into ethanoic acid. In this reaction, alkaline potassium permanganate acts as:

The colour of white light which suffers the maximum bending (or maximum refraction) on passing through a glass prism is:

Depletion of ozone layer is noticed on :