Bacterial Reproduction: The Binary Fission Process
The question asks for the method of reproduction in bacteria where a single parent cell divides into two identical daughter cells.
Understanding Binary Fission
Binary fission is the primary mode of asexual reproduction in bacteria and other prokaryotic organisms. The process involves:
- Replication of the bacterial DNA.
- The cell elongates.
- The cell membrane grows inward, and a new cell wall forms, dividing the parent cell.
- The parent cell splits into two genetically identical daughter cells.
This direct splitting matches the description provided in the question.
Analyzing Other Reproduction Methods
Let's look at why the other options are not the correct answer for the described process:
- Spore formation: This involves the formation of specialized, resistant spores within the cell, which can germinate later. It's not a simple splitting into two cells.
- Fragmentation: This method involves the breaking of the parent organism into multiple fragments, each capable of regenerating into a new organism. This is common in some algae and fungi, not the primary way bacteria divide into two.
- Budding: This involves the formation of a small outgrowth (bud) from the parent cell, which eventually detaches to become a new individual. This differs from the direct splitting described.
Therefore, binary fission is the method where the parent cell simply splits into two daughter cells.
Important Questions from Miscellaneous
A stone is thrown horizontally from the top of a 20 m high building with a speed of 12 m/s. It hits the ground at a distance R from the building. Taking g = 10 m/s2 and neglecting air resistance will give :
A sphere of volume V is made of a material with lower density than water. While on Earth, it floats on water with its volume f1V (f1 < 1) submerged. On the other hand, on a spaceship accelerating with acceleration a < g (g is the acceleration due to gravity on Earth) in outer space, its submerged volume in water is f2V. Then:
A railway wagon (open at the top) of mass M1 is moving with speed v1 along a straight track. As a result of rain, after some time it gets partially filled with water so that the mass of the wagon becomes M2 and speed becomes v2. Taking the rain to be falling vertically and the water stationery inside the wagon, the relation between the two speeds v1 and v2 is :
Consider the following statements:
1. Distance between the longitudes becomes zero on North Pole and South Pole.
2. Distance between the longitudes is maximum on the Equator.
3. Number of longitudes is more than number of latitudes.
Which of the statements given above is/are correct?
One block of 2⋅0 kg mass is placed on top of another block of 3⋅0 kg mass. The coefficient of static friction between the two blocks is 0⋅2. The bottom block is pulled with a horizontal force F such that both the blocks move together without slipping. Taking acceleration due to gravity as 10 m/s2, the maximum value of the frictional force is :
