Ans.
Cell-to-cell communication allows signalling of essential substances between the plant cells, which are surrounded by cell walls. The molecules used by plants for long-distance signalling are known as hormones, such as auxin, ethylene, and gibberelin.
These hormones are secreted by one plant cell and received by another plant cell, where it exerts it affect. Thus, the correct answer to be fill in the blank is 'option A). hormones.'
Answer:
Wetland reduction has caused a decrease in the absorption zones for excess water. If the excess water cannot be absorbed by the soil, it increases the incidence and magnitude of flooding.
Answer:
The given statement is True.
A human body is composed of around 60 percent of water, the average range is around 50-65 percent.
Water is a vital nutrient for any living organism including human beings.
Being a universal solvent, it primarily helps in metabolism and transportation of proteins and carbohydrates in our body.
It helps in maintaining the internal body temperature through respiration and sweating.
It helps in excretion of waste material through urination.
It lubricates joints and acts as shock absorbent for the fetus, spinal cord, and brain.
In general, Yes True <span />
