Any factor that can bring a change in the body of an organism is called:

1. Response
2. Stimulus
3. Reflex
4. Impulse

Gyri and sulci are richly found in :

1. Renal cortex
2. Cerebral cortex
3. Spinal cortex
4. Adrenal cortex

Name the following:

(a) The fluid that is present inside and outside the brain.

(b) The junction between two nerve cells.

(c) The part of the brain which is concerned with memory.

(d) The central space of the brain.

Note the relationship between the first two words and suggest the suitable word/words for the fourth place.

(a) Stimulus : Receptor :: Impulse : ……………

(b) Cerebrum : Diencephalon :: Cerebellum : ……………

(c) Receptor : Sensory nerve :: Motor nerve : ……………

(d) Axons : Nerve :: Cytons : ……………

(e) Cerebrum : Corpus callosum :: Cerebellum : …………… .