T Flashcards

1
Q

Test cross

A

A genetic cross used to find out the genotype of an organism.

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2
Q

Testis

A

(plural: testes) the male sex organs where sperm cells and testosterone are produced.

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3
Q

Testosterone

A

The hormone, produced by testes, that stimulates the development of secondary sexual characteristics in males and the development of sperm cells.

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4
Q

Tissue

A

a group of similar cells that act together to perform the same function.

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5
Q

Tissue fluid

A

The fluid that bathes the cells when plasma and some white blood cells pass out of the capillaries.

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6
Q

Toxin

A

a poisonous substance. Bacteria release toxins as waste products which bring about the symptoms of a diseases, e.g. high fever.

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7
Q

Translocation

A

The movement of sucrose and amino acids in a phloem.

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8
Q

Transmissible disease

A

A disease in which a pathogen can be passed from one host to another.

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9
Q

Transpiration

A

The evaporation from the surfaces of mesophyll cells in leaves followed by diffusion of water vapour through stomata into the atmosphere.

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10
Q

Trophic level

A

The position of an organisms in a food chain, food web, pyramids of numbers, biomass or energy. (herbivores are primary consumers and form the second trophic level).

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11
Q

Tropism

A

A growth response by part of a plant to a stimulus, e.g. light or gravity.

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12
Q

Thrombosis

A

A blood clot that occurs in a vein or an artery.

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13
Q

Tuber

A

A swollen stem of a potato for food storage and asexual reproduction.

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14
Q

Turgor

A

The pressure exerted by a plant cell onto its cell wall. Turgid cells are firm because they are full of water; this can support plant organs such as stem.

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