A Plant cell shrinks when placed in-
(a) A hypertonic solution
(b) Water
(c) A hypotonic solution
(d) A solution isotonic with the cell sap
Hypertonic solution is higher concentration than cells sap and Hypotonic Solution is solution having concentration less than cells sap.
Which of the following becomes zero in a fully turgid cell?
(a) Water potential
(b) Osmotic pressure
(c) Wall pressure
(d) All of the above
Osmotic pressure is the minimum pressure which needs to be applied to a solution to prevent the inward flow of its pure solvent across a semipermeable membrane, It become zero in a fully turgid cell.
According to cellular structure which one of the following is most complex?
(a) Bacteria
(b) Fungi
(c) Protozoa
(d) Algae
Most fungi are multicellular, but yeast is a unicellular fungus, Cells of Fungi share the characteristic of both plant and animal. Algae can be both unicellular and multicellular, Bacteria and Protozoa are unicellular they are single cell.
In plants, the receptor for detecting photoperiod is-
(a) Gradient of K+
(b) Sensory cell
(c) Sensory organelles
(d) Protein molecule
Example of Sensory organelle is Chloroplast.
The smallest size of a cell which can be seen with unaided eye is-
(a) One Micron
(b) 10 Micron
(c) 100 Micron
(d) 1000 Micron
100 micron the smallest objects that can be seen with unaided eye.
The longest cell in animals is -
(a) Blood cell
(b) Nerve cell
(c) Muscle cell
(d) Kupffer cell
The longest cell in an animal is the nerve cell, also known as a Neuron. Ostrich egg is the largest cell and Mycoplasma gallicepticum(0.0001 mm) is the smallest cell.
Crossing over occurs during meiosis at-
(a) Leptotene
(b) Anaphase-I
(c) Pachytene
(d) Diakinesis
Pachytene is a third phase of the prophase of meiosis system. Crossing over occurs between non-sister chromatids of homologus chromosome.