IMPORTANT TERMS
GUTTATION: Loss of water from the edges of the leaves through a stomata like opening called hydathode.
TRASPIRATION: Loss of water in the form of vapours from the living through the aerial parts of plant.
SCIENTIFIC TERMS
SOIL WATER RELATION
HOLARD: The total amount of water present in the soil.
CHESARD: Water available to the plants.
ECHARD: Water that can not be absorbed by plants.
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BASIC TERMS IN GENETICS
Polyhybrid cross- A breeding experiment dealing with more than two traits at a time.
Inbreeding- Production of offsprings by mating of closely related parents such as cousins.
Outbreeding- Production of offsprings by mating of unrelated parents.
Heterosis or Hybrid vigour- Greater vitality and vigour of the heterozygous individuals produced by outbreeding is called heterosis
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GENETIC DISEASES
ALKAPTONURIA — Inborn metabolic defect by single gene
PHENYLKETONURIA—-Recessive inherited disease Homozygous individual are affected while heterozygous are carrier.The child is born normal but within 6 months he develops the symptoms.
GENETIC DISEASES
Haemophilia–It is a sex linked disease caused by recessive gene present on X chromosomes
TYPES OF CHROMOSOMES
Metacentric chromosomes—- In which the centromere is near middle and two arms are equal.
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PLACENTATION
MARGINAL PLACENTATION —Placenta develop and ovules are born along the junction of the two margins of the carpel.ex Pea
AESTIVATION
VAXILLARY: The posterior petal is largest & it overlaps the margins of two lateral petals and these lateral petals overlaps the two smallest anterior petals .This kind of aestivation is present in family Papilionaceae
TYLOSES
Tylosis : Ingrowth of parenchymatous cells into xylem vessels and tracheids through pits due to enormous secondary growth.