Question

Briefly describe the modes of reproduction in bacteria​

Answer 1

Answer:

• Bacteria reproduce by binary fission. In this process the bacterium, which is a single cell, divides into two identical daughter cells. Binary fission begins when the DNA of the bacterium divides into two (replicates). The bacterial cell then elongates and splits into two daughter cells each with identical DNA to the parent cell. Each daughter cell is a clone of the parent cell.

When conditions are favourable such as the right temperature and nutrients are available, some bacteria like Escherichia coli can divide every 20 minutes. This means that in just 7 hours one bacterium can generate 2,097,152 bacteria. After one more hour the number of bacteria will have risen to a colossal 16,777,216. That’s why we can quickly become ill when pathogenic microbes invade our bodies.

Answer 2

Answer:

Nutrition- Requirement of food and water for the maintaing of proper function of the body

there are two ways of nutrition

1 - autotrophic and

2 - heterotrophic

1- Autotrophic - an organism manufacture there own food.

There are two ways of autotrophic nutrition.

1 -is photo -autotrophic

2- is chemo -autotrophic

photo-autotrophic mean An organisms make their own food by using solar energy. ex- All green plants.

2- chemo-autotrophic mean- an organism make their own food by using chemical energy. ex- Bacteria.

.... Heterotrophic nutrition....

an organism for food depends on the other organism.

ex- all animals, fungi.

Types of Heterotrophic

A.- HOLOZOIC - feeding solid food.

There are ten types of HOLOZOIC.

1 - FURGIVOROUS - animal eating fruits. ex- parrot, squirrel.

2 - SANGUIVOROUS - Blood succking animals. ex- female mosquito, leech.

3- HERBIVORES - Plant eating animals. ex- Rabbit, cattle.

4 - OMNIVOROUS - Both plant and animals eating animal. ex-cockroach, earthworm , human.

5 - INSECTIVOROUS - Insects eating animals. ex- Lizard,Frog.

6 - PREDATOR - carnivore animal or /flesh eating animals ex- lion, Tiger leopard.

7 - CANABILISM - Animals eating ownkind (similar species). ex- Fish, snakes, scorpions,spider.

8 - SCAVENGER - Rotten flesh eating animals. ex- valture.

9 -CAPROPHAGUS Animal eating fecal matter (weast meterial ) ex- pig, rabbit.

10 - MIXOTROPHIC - An organism obtained food more than one process/ method. ex-Euglena.

B. - OSMOTROPHIC - An organism obtained their food from decomposed material.

Two types of osmotrophic

1- Saprozoic mean - osmotrophic animals. ex- euglena.

2- Saprophytic mean - osmotrophic plant. ex- Fungi.

C.- PARASITIC - An organisms obtained readymade food from host.

D. - ex- lichen = Algae[chlorophyll present] :( photosynthesis occurs) + fungi [ chlorophyll absent]:( photosynthesis not occurs)..