Question

Robert brown is known for his discovery of
A. Chloroplast.
B. Respirometer.
C. Nucleus.
D. Mitochondria.

Answer 1

Hint: Robert Brown in the year 1831 discovered a membrane bound organelle found in eukaryotes when he spotted an opaque area,while studying the orchids under a microscope. This organelle is a site for the genetic material and also it is the largest organelle of the cell.

Complete answer:
> Robert Brown in the year 1831 discovered the nucleus.
> Nucleus- The nucleus is a membrane-bound organelle found in eukaryotic cells. The structures of the nucleus are as follows: it consists of the nuclear envelope which is a double membrane that includes the complete organelle and separates its matters from the cellular cytoplasm, it consists of the nuclear matrix (which contains the nuclear lamina), a system inside the nucleus that provides mechanical support.
> The regulation of gene expression and to facilitate the replication of DNA during the cell cycle is the main function of the cell nucleus.
Also,
> Hugo von Mohl discovered Chloroplast in the year 1837. Chloroplasts are organelles whose function is to perform photosynthesis.
> A device used to monitor the rate of respiration of a living organism by evaluating its rate of exchange of oxygen and carbon dioxide is called a respirometer.
> Mitochondria were first discovered by Albert von Kolliker in the year 1850. The powerhouse of the cell is also another name of mitochondria.

The correct answer for the above question is option( C ) that is Nucleus.

Note: The nucleus was discovered by Scottish botanist Robert Brown in 1831 and the cells were discovered by Robert Hooke in 1665. Nucleus is the membrane bound organelle which acts as the brain of the cell because it regulates all the activities within the cell.