A limiting factor is something that restricts organism(s) from increasing their population. If you look at a graph showing the population of a certain organism, you will notice that at a certain amount of their population it stays around the same area. That is known as the <em>carrying capacity</em>. The carrying capacity is there due to the limiting factors, which depends based on the needs of particular organisms. For example, one limiting factor for a certain species might be that the number of predators increased, or there are limited resources available in order to survive.
<h2>d) option is correct </h2>
Explanation:
The stringent response occurs in response to low energy store
For example when there is low level of lactose it means energy level is low so there will be no transcription of genes and hence transportation and catabolism of lactose will be inhibited
When E coli is grown in mixture of both glucose and lactose, at high glucose concentration the growth rate is maximum and lactose catabolism is repressed, this called as catabolite repression and it is due to level of cAMP
There are 4 electrons altogether shared between carbon atoms in a molecule of C2H4, to be more precise there are 2 electron pairs shared between the carbon atoms.
