3. Robert Hooke was the first person to observe cells. He observed these cells in (a) a piece of cork.
(b) a slice of honeycomb.
(c) human blood.
(d) plaque from his own teeth.

QUESTION:- Robert Hooke was the first person to observe cells. He observed these cells in

(a) a piece of cork.

(b) a slice of honeycomb.

(c) human blood.

(d) plaque from his own teeth.

ANSWER:- (a) a piece of cork.

The cell was first discovered and named by Robert Hooke in 1665. He remarked that it looked strangely similar to cellula or small rooms which monks inhabited, thus deriving the name. However what Hooke actually saw was the dead cell walls of plant cells (cork) as it appeared under the microscope.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.