Which one of the following is not a cause for urban migration?
a)
to operate of machines used in manufacturing factories
b)
to get employment as drivers for construction trucks used to build the roads in a city
c)
manual jobs in the manufacturing industries within a city
d)
search for suitable land for agriculture

The option which is not responsible for the cause of urban migration is the search for suitable land for agriculture. Hence the answer is option D.

Explanation:

The land for agricultural use is available in rural areas and it is not available in urban areas. The land in urban areas is suitable for infrastructure and buildings and houses. Hence there is no land available for the agriculture purpose.

Also, we know that there is much pollution in urban areas which is not suitable for the growth of crops. In rural areas the atmosphere and all the condition is favorable for the growth of crops. Hence, we can see that it is not a cause for migration to urban areas.  

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.