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Long-term responses - Behaviour of Plants
Plants alter their course of development to suit the prevailing environmental conditions. For example, leaf maturation and fall, onset of flowering and dormancy of seeds display some of the plant characteristics set in this way. Stress conditions may prepone or postpone the developmental processes. Abscisic acid levels in plant tissues increase under stress caused by nutrient deficiency or toxicity, salinity, chilling and water-logging resulting in reduced growth and metabolism. This can prepone or postpone flowering and seed set.
Determine the Factors that Affecting Food Choice? As a dietician, it is necessary to understand how our food choices are affected. Every day we make food choices which influenc
Q. How do antibodies work to neutralize antigens? The immunoglobulins or antibodies act to facilitate the destruction of antigens: they attract phagocytic leukocytes, they dire
Increase in population size is known as population growth. It depends upon number of persons added to the population and number of persons lost from the population. Addition in pop
Q. What are the fundamental constituents of the cell membrane? The cell membrane is formed of lipids, carbohydrates and proteins. The membrane lipids are phospholipids, a sp
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Discuss about electric field The electric field is a vector quantity whose magnitude is the force per unit charge and points in the direction of the force on the positive test
A complete motor neuron is removed from a frog and placed in a large volume of normal physiological saline. The neuron is healthy; it has a stable resting voltage of -70 millivolt
Name the enzyme present in saliva and say what type of food it acts on. The enzyme in saliva is salivary amylase and it acts on starch.
Substance A is being investigated to see if it is an enzyme. When substance A is mixed with substance B a reaction takes place. A control experiment is conducted using a sample of
How is the cerebrum anatomically divided? The cerebrum is divided into two cerebral hemispheres, the right and the left. Each hemisphere is made of four cerebral lobes: frontal
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