Final answer:
In plants, secretory cells or tissues can secrete amino acids and sugars, but not typically starch or oxygen in the manner implied by secretion. Amino acids and sugars are involved in plant growth and interactions, while oxygen is a byproduct of photosynthesis and starch is stored internally. The correct options are 1 and 2.
Step-by-step explanation:
The secretory cells or tissues in plants can secrete a variety of substances that are essential for their growth, development, and adaptation to their environment. Among the options provided:
- Amino acids are commonly secreted by plant cells as they are the basic building blocks of proteins.
- Sugars can be secreted by plant cells, especially as nectar to attract pollinators or as exudates from roots to interact with soil microorganisms.
- Oxygen is indeed a byproduct of photosynthesis and is released by plant cells, but it is not typically considered a substance secreted by secretory cells or tissues.
- Starch is usually stored within plant cells rather than being secreted.
Therefore, amino acids and sugars are examples of substances secreted by secretory cells or tissues in plants, while oxygen is not typically secreted in this manner, and starch is stored rather than secreted.
Glands in plants and animals are secretory tissues that release substances necessary for various biological functions. For example, the Golgi apparatus (GA) in plant cells is involved in the synthesis of polysaccharides, some of which contribute to the cell wall or other parts of the cell.
Moreover, glands such as merocrine, apocrine, and holocrine have different secretion mechanisms in animals.