The correct answer is Option 3: Both 1 and 2.

1. Sweet orange plant is propagated by grafting technique:

This statement is correct. Sweet orange plants, also known as Citrus sinensis, are commonly propagated through grafting. Grafting involves joining a stem (scion) from the desired variety of sweet orange onto the rootstock of a closely related citrus tree. This method allows for the desired characteristics of the scion, such as fruit quality and disease resistance, to be combined with the strong root system of the rootstock.

Grafting is a common technique used in horticulture to propagate plants with desirable traits or characteristics, as it allows for the production of identical copies (clones) of the parent plant. It is widely used in fruit tree propagation to maintain consistent fruit quality and traits.

2. Jasmine plant is propagated by layering technique:

This statement is also correct. Jasmine plants, belonging to the genus Jasminum, can be propagated through a technique called layering. Layering involves bending a low-growing branch or stem of a plant and burying a portion of it in the soil while keeping the rest exposed. Over time, roots develop from the buried portion, and once established, the rooted section can be separated from the parent plant and potted or transplanted elsewhere.

Layering is a common method used to propagate many woody and semi-woody plants, including various species of jasmine. It is a relatively simple and effective technique that allows the new plant to develop its own root system while still attached to the parent plant.

In conclusion, both statements are correct. Sweet orange plants are propagated by grafting, while jasmine plants are propagated by layering. These propagation techniques are widely used and have been successful in reproducing desirable plant varieties for cultivation.