3. That the cell membrane is selectively permeable can be best deduced by
(a) The entry of water from root hair
(b) The entry of mineral salts from the root hair
(c) Both together
(d) The rise of sap in plants
Ans. (c) This type of membranes allow selective passage of solutes along with solvent through them. Many biological membranes such as cell membranes, tonoplast and the membranes surrounding the sub-cellular organelles are selectively permeable.
(a) Aseptate and multinucleate (b) Septate and multinucleate (c) Aseptate and uninucleate (d) Septate and uninucleate Answer. (b) The mycelium of Aspergillus consist of branch septate hyphae. Cells of hyphae are multinucleate. (185)
(a) Parenchyma (b) Chlorenchyma (c) Plectenchyma (d) Collenchyma Answer. (c) Plectenchyma (Pseudoparenchyma) is nothing but the interwoven mass of fungal mycelium which in cross-section look like parenchyma. (108)
(a) Colletotrichum falcatum (b) Phytophthora infestans (c) Potato mosiac virus (d) Alternaria solani Answer. (b) Late blight of potato is a seed born disease which is caused by Phytophthora infestans. The disease is characterised by brownish to blackish dead areas …
