Practice MCQ Questions and answers on Biology-GK

When the concentration of water and solutes on either side of the cell membrane is same, the solution is said to be isotonic.

Water enters the root hair cells by osmosis. This happens because soil water has a higher water potential than the cytoplasm of the root hair cell. Minerals enter by active transport.

Root pressure, in plants, force that helps to drive fluids upward into the water-conducting vessels (xylem). It is primarily generated by osmotic pressure in the cells of the roots and can be demonstrated by exudation of fluid when the stem is cut off just aboveground.

Meiosis is the process which accounts for species diversity. Meiosis is termed as a specialized cell division which reduces chromosomes number by half and then creates for haploid cells.

Chromatids are found during metaphase.

Centrioles are built from a cylindrical array of 9 microtubules, each of which has attached to it 2 partial microtubules.

During prophase chromosomes appear as thin threads in the nucleus.

Mitosis is missing and the cell is divided by binary fission in prokaryotes.

During interphase, the cell grows and the nuclear DNA is duplicated.

The sister chromatids are pairs of identical copies of DNA joined at a point called the centromere. During anaphase, each pair of chromosomes is separated into two identical, independent chromosomes. The chromosomes are separated by a structure called the mitotic spindle.