How is a prokaryotic cell different from an eukartotic cell?
What will be an idial response.
Answer: On the basis of presence or absence of a well organised nucleus, cells are of two types-Prokaryotic and Eukaryotic.
Differences between prokaryotic and eukaryotic cell are as follows:
| Prokaryotic cell | Eukaryotic cell |
(i) Lacks well organised nucleus surrounded by nuclear membrane. Such a nucleus is called nucleoid. (ii) Membrane-bound cell organelles is absent. (iii) Single chromosome present. (iv) Small in size | (i) Well organized nucleus surrounded by nuclear membrane is present, (ii) Membrane- bound cell organelles is present, (iii) More than one chromosome present. (iv) Large in size. |
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Well-developed vascular systems are absent in all of the following except
A. mosses. B. liverworts. C. hornworts. D. Charophytes. E. Pterophytes.
Ozone is a form of oxygen in the atmosphere that absorbs a large amount of ultraviolet radiation from the Sun. Without ozone in the atmosphere
a) there would be more plant growth b) more sunlight would reach Earth c) there could be damage to plants and algae d) ozone does not affect Earth
At some stage of the life cycle, all chordates have
A) a pre-anal tail. B) an external skeleton. C) a ventral nerve cord. D) a backbone. E) pharyngeal gill slits.
Invertebrates on land use __________ or __________ systems for gas exchange.
Fill in the blank(s) with the appropriate word(s).