The size of stomata to check transpiration
        
                    
             
        
        
        
Answer:
The correct answer will be- Crop rotation
Explanation:
When the growth of a type of crop which uses soil nutrients in abundance and then growing another crop in the same filed led to the decrease in the production of the next crop.
Thus farmers adapted to avoid such farming practices and developed a new practice which allowed the land to become fertile again so that the growth of next crop will not be affected.
The practice involved the planting of a crop on a piece of land then leaving the soil ploughed and unsown for a longer period of time and growing corp on another piece of land allowing the time to restore the nutrient content. This practice is known as "crop rotation".
Thus, crop rotation is the correct answer.
 
        
             
        
        
        
Answer:
E. Nucleus
Explanation:
All living organisms were classified into three major domains viz: Eukarya, Archaea and Bacteria. Eukarya are referred to as EUKARYOTES while the other two domains are collectively referred to as PROKARYOTES. 
The major basis of this classification is the presence or absence of a membrane bound NUCLEUS. Eukaryotes are organisms characterized by the possession of a membrane-bound nucleus that houses their genetic material (DNA) while prokaryotes lack a nucleus and hence, their genetic material is found naked in the cytoplasm. Although, prokaryotic cells lack other membrane-bound organnelles like Chloroplast, mitochondria etc. but nucleus is the basis of this classification:
EU meaning TRUE, KARYA meaning NUCLEUS, hence Eukarya means organisms will true nucleus.
 
        
             
        
        
        
Answer:
Lag Phase
Explanation:
In logistic growth, lag phase is characterized by a slowing population growth because at that moment the cells are metabolically active and  are only increasing in cell size.
Let consider a bacterial growth during it lag phase. In the lag phase, bacteria adapt themselves to growth conditions, that period of time, they are still maturing and are yet to divide.
As such, the phase of a population growth curve is characterized by a slowing of population growth as the carrying capacity is being reached is known as Lag Phase.