Differentiate reflex arc and reflex action Reflex arc Reflex action The nerve pathway that nerves take when they transfer sensory information from the receptor to the spinal cord and then transmit the response to the effector organ(s) during a reflex action is known as the reflex arc. Reflex action is an involuntary functioning or movement …
To determine whether a trait is dominant or recessive, one must have knowledge of at least three generations. The dominant or recessive nature of the given characteristic cannot therefore be determined.
FUNCTIONS OF HYPOTHALAMUS (i)Receives impulses.(ii)regulating body temperature(iii)controls emotions and mood (iv)controls the ability to taste and smell.(v) synthesises vital hormones for the body(vi)integrates the autonomous nervous system’s messages(vii) controls blood pressure, peristalsis, pulse, hunger, and other functions(viii)forms an axis with the pituitary gland, the primary connection between the endocrine and nervous systems.
REFLEX ACTION: A reflex, or reflex action, is an involuntary and nearly movement in response to a stimulus. A reflex is made possible by nervous pathways called reflex arcs . which can act on an impulse before that impulse reaches the brain.e.g When light acts as a stimulus, the pupil of the eye changes in …
Ethylene Plant Hormone Both an inhibitor and a growth promoter, it works. takes the form of gas. It is created in tissues going through senescence and in ripening fruits. It is one of the most commonly utilised hormones in agriculture and controls a number of physiological processes. Functions Ethylene Plant Hormone: (i) It accelerates fruit ripening.(ii) …
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Abscisic Acid It is a hormone that inhibits growth. GAs are counterbalanced by ABAs. It promotes dormancy and abscission by inhibiting plant metabolism. Because it raises plants’ stress tolerance, it is also known as “stress hormone.” Abscisic acid (ABA). Functions of Abscisic acid: (i)causes leaves and fruits to fall off (ii) inhibits the germination of seeds …
Cytokinins Hormone In the process of cytokinesis, cytokinins are important. Plants that experience fast cell division, such as those with root apices, shoot buds, early fruits, etc., naturally produce cytokinins. Cytokinins migrate in a polar and basipetal manner. Natural: Isopentenyl adenine, zeatin (corn kernels, coconut milk). Synthetic: thidiazuron, kinetin, benzyladenine, and diphenylurea. Functions of Cytokinins hormone: …
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(B)Gibberellins Hormone More than 100 gibberellins (GA1, GA2, GA3…..) are known. They are acidic. These are found in higher plants and fungi. Functions of Gibberellins : (i) promotes bolting, which is the sudden elongation of internodes in mound plants like cabbage and beets just before flowering (ii) delays senescence (iii) helps to parthenocarpy (iv) stem …
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Auxin Hormone Auxin means “to grow”. They are mostly used in agricultural and horticultural practices. They are found in the growing apex of roots and stems. Natural: Indole-3-acetic acid (IAA), Indole butyric acid (IBA)Synthetic: 2,4-D (2,4-Dichlorophenoxyacetic acid), NAA (Naphthalene acetic acid) Functions of Auxin : (i)The elongation of stem and root cells (ii) IAA in the apical bud inhibits …
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