Testa (botany) in the context of "Test (biology)"

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⭐ Core Definition: Testa (botany)

In botany, a seed is a plant structure containing an embryo and stored nutrients in a protective coat called a testa. More generally, the term "seed" means anything that can be sown, which may include seed and husk or tuber. Seeds are the product of the ripened ovule, after the embryo sac is fertilized by sperm from pollen, forming a zygote. The embryo within a seed develops from the zygote and grows within the mother plant to a certain size before growth is halted.

The formation of the seed is the defining part of the process of reproduction in seed plants (spermatophytes). Other plants such as ferns, mosses and liverworts, do not have seeds and use water-dependent means to propagate themselves. Seed plants now dominate biological niches on land, from forests to grasslands both in hot and cold climates.

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👉 Testa (botany) in the context of Test (biology)

In biology, a test is the hard shell of some spherical aquatic animals and protists, notably sea urchins and microorganisms such as testate foraminiferans, radiolarians, and testate amoebae. The term is also applied to the covering of scale insects. The related Latin term testa is used for the outer layer of the hard seed coat of plant seeds.

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In this Dossier

Testa (botany) in the context of Sarcotesta

The sarcotesta is a fleshy seedcoat, a type of testa. Examples of seeds with a sarcotesta are pomegranate, ginkgo and some cycad seeds. The sarcotesta of pomegranate seeds consists of epidermal cells derived from the integument, and there are no arils on these seeds.

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Testa (botany) in the context of Acorn

The acorn is the nut of the oaks and their close relatives (genera Quercus, Notholithocarpus and Lithocarpus, in the family Fagaceae). It usually contains a seedling surrounded by two cotyledons (seedling leaves), enclosed in a tough shell known as the pericarp, and borne in a cup-shaped cupule. Acorns are 1–6 cm (1⁄2–2+1⁄2 in) long and 0.8–4 cm (3⁄8–1+5⁄8 in) on the fat side. Acorns take between 5 and 24 months (depending on the species) to mature; see the list of Quercus species for details of oak classification, in which acorn morphology and phenology are important factors.

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LINKED FROM (PARENTS)
← Sarcotesta ← Acorn ← Test (biology)
LINKS TO (CHILDREN)
Micrograph → Botany → Embryo → Sowing → Husk → Tuber → Ovule → Embryo sac → Fertilization → Pollen → Zygote → Reproduction → Spermatophytes → Fern → Moss → Marchantiophyta → Ecological niche → Forest → Grassland → Climates →