Which of the following are covered by a single membrane?
(a) Mitochondria
(b) Vacuole
(c) Lysosome
(d) Plastid
Plasmolysis in a plant cell is defined as
(a) break down (lysis ) of plasma membrane in hypotonic medium
(b) shrinkage of cytoplasm in hypertonic medium
(c) shrinkage of nucleoplasm
(d) none of them
Following are a few definitions of osmosis
Read carefully and select the correct definition
(a) Movement of water molecules from a region of higher concentration to
a region of lower concentration through a semipermeable membrane
(b) Movement of solvent molecules from its higher concentration to lower
concentration
(c) Movement of solvent molecules from higher concentration to lower
concentration of solution through a permeable membrane
(d) Movement of solute molecules from lower concentration to higher
concentration of solution through a semipermeable membrane
Which of these is not related to endoplasmic reticulum?
(a) It behaves as transport channel for proteins between nucleus and
cytoplasm
(b) It transports materials between various regions in cytoplasm
(c) It can be the site of energy generation
(d) It can be the site for some biochemical activities of the cell
Which of these options are not a function of Ribosomes?
(i) It helps in manufacture of protein molecules
(ii) It helps in manufacture of enzymes
(iii) It helps in manufacture of hormones
(iv) It helps in manufacture of starch molecules
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (iv) and (i)
Chromosomes are made up of
(a) DNA
(b) protein
(c) DNA and protein
(d) RNA
A cell will swell up if
(a) The concentration of water molecules in the cell is higher than the
concentration of water molecules in surrounding medium
(b) The concentration of water molecules in surrounding medium is higher
than water molecules concentration in the cell
(c) The concentration of water molecules is same in the cell and in the
surrounding medium
(d) Concentration of water molecules does not matter
Which of the following can be made into crystal?
(a) A Bacterium
(b) An Amoeba
(c) A Virus
(d) A Sperm
In the Gold foil experiment of Geiger and Marsden, that paved the way for
Rutherford’s model of an atom, ~ 1.00% of the α-particles were found to
deflect at angles > 50º.
If one mole of α-particles were bombarded on the gold foil, compute the number of α-particles that would deflect at angles less than 500.
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