Control and Coordination — Science STD 10 — Question

Magnification produced by a concave lens is always:

Which of the following is a mis-matched pair?

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 signals from spinal cord to muscles.
3. Motor neurons carry signals from receptors to spinal cord.
4. The path through which signals are transmitted from a receptor to a muscle or a gland is called reflex arc.

Study the different conclusions drawn by students on the basis of their observations of fresh available specimens of plants and animals :

• Potato and sweet potato are homologous organs.
• Wings of insects and wings of bird are analogous organs.
• Wings of insects and wings of bats are homologous organs.
• Thoms of citrus arid tendrils of cucurbita are homologous organs.

The correct conclusions are:

Name the material used for making the connection wires :

The plant hormone which triggers the fall of mature leaves and fruits from the plant body is:

Which of the following can damage optic nerve leading to blindness, if taken internally?

Whatever be the position of the object, the image formed by a mirror is virtual, erect and smaller than the object. The mirror then must be :

The process of digestion of food in humans begins in:

Heating pyrites to remove sulphur is called :