Apical meristem

Located  at  root  and  shoot  tips and produce primary tissues are called apical meristems

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#XL - T Zoology

The adhesiveness of cadherins depends on the presence of extracellular Ca2+

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#XL - T Zoology

Light-triggered closing of the cGMP-gated cation

channels causes a drop in the cytosolic Ca2+ concentration inside the rod cell.

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#XL - R Botany

Shoot apical meristem

shoot apical  meristem, a dome-shaped  mass of dividing cells at the shoot tip

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#XL - R Botany

Permanent tissue

they will undergo differentiation to perform specific function

they are mature cells

Large central vacuole occur in living permanent cells

nucleus of each cell of this tissue is less conspicuous

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#Id: 9408

#XL - T Zoology

Group Living Has Advantages and Disadvantages

When animals live together in groups such as flocks or herds

Disadvantage- Group promote competition for food and increased transmission of parasites and other diseases.

Advantage - Benefits relate to group defense against predators through increased vigilance and through protection in numbers.