The growth form of a plant, comprising its size, shape and orientation is known as:

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Accepted Answer

1. Definition: In botany the term "habit" (often written as $habit$) denotes the growth form of a plant — its size, shape and orientation.

2. Why other choices are incorrect:
   - (2) environment: refers to external physical and biotic conditions affecting the plant, not the plant's form.
   - (3) habitat: means the place or ecological area where a plant lives.
   - (4) growth pattern: a descriptive phrase but not the standard technical term used in botany.

3. Conclusion: The standard botanical term for a plant's size, shape and orientation is (1) habit, i.e. option (a).

FINAL_ANSWER: a

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