1. | the cell plate that represents the middle lamella |
2. | the cell plate that represents the primary cell wall |
3. | the cleavage furrow that represents the middle lamella |
4. | the contractile ring that represents the primary cell wall |
If you are provided with root-tips of onion in your class and are asked to count the chromosomes, which of the following stages can you most conveniently look into?
1. | Telophase | 2. | Anaphase |
3. | Prophase | 4. | Metaphase |
Plants show mitotic divisions:
1. only in germ line cells
2. at the root apex and shoot apex only
3. in both diploid and haploid cells
4. for the productions of gametes only
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The phase of the cell cycle that lasts for the least time is the:
1. | G1 phase | 2. | S phase |
3. | G2 phase | 4. | M phase |
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A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in
1. | Polyteny | 2. | Aneuploidy |
3. | Polyploidy | 4. | Somaclonal variation |