Write notes on-
P9.164-
pg.16.4
Root pressure, Transpiration,
173 g
Pa 175
cell, Human brain, Reflex action
Answers
Answer:
Root pressure is the transverse osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves. ... At night in some plants, root pressure causes guttation or exudation of drops of xylem sap from the tips or edges of leaves.
Transpiration is the process in which plants release the water inside it in the form of moisture or water vapor. Roots consume some amount of water from the soil and the rest evaporates in the atmosphere. Parts of plants such as stems, small pores on leaves, and flowers evaporate the water to the atmosphere.
A cell is defined as the fundamental, structural and functional unit of all life.
The essential functions of the cell include:
The cell provides support and structure to the body.
Facilitates growth by mitosis
Helps in reproduction
Provides energy and allows the transport of substances.
The brain is one of the largest and most complex organs in the human body. It is made up of more than 100 billion nerves that communicate in trillions of connections called synapses. The brain is made up of many specialized areas that work together: The cortex is the outermost layer of brain cells.
A reflex, or reflex action, is an involuntary and nearly instantaneous movement in response to a stimulus. A reflex is made possible by neural pathways called reflex arcs which can act on an impulse before that impulse reaches the brain.
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