Theoretically, which two of the following present the richest potential sources of silica?

1.  marine sediments consisting of foram tests

2.  marine sediments consisting of diatom cases (valves)

3.  marine sediments consisting of radiolarian shells

4.  marine sediments consisting of dinoflagellate plates

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#Question id: 13229

#XL - R Botany

Deficiencies in mineral elements in most species chlorosis (yellowing of the leaves), especially in the older leaves near the base of the plant by

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#Question id: 13232

#XL - R Botany

Plants that develop root pressure frequently produce liquid droplets on the edges of their leaves, a phenomenon known as

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#Question id: 13233

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Tracheids are

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#Question id: 13234

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Some roots can develop positive hydrostatic pressure in their xylem is called

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#Question id: 13552

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Transpiration from the leaf depends on two major factors;

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#Question id: 13554

#XL - R Botany

The microscopic stomatal pores provide a pathway for diffusional movement of gases across the epidermis and cuticle