17. Plant cells do not burst in distilled water, because
(a) Cell wall is elastic, rigid and get stretched
(b) Cell wall is living
(c) Cell wall is the outer most layer of plant cell
(d) Cell wall is permeable
Ans. (a) Cell wall is the outermost, rigid, protective, non living and supportive layer found in all the plant cells. It is not found in animal cells. When an animal cell placed pure water will swell up and burst, because of endosmosis.
(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. (184)
(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. (104)
(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 …
