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Define the term false fruit
A plant structure that resembles a fruit but is not derived from a flower or flowers
State TWO characteristics of insect pollinated plants
- 1.Flowers are usually large, brightly-colored and scented to attract
- insects. If the flowers are small they may group together to form
- conspicuous inflorescences.
- 2.Nectar is often present to attract insects.
- 3.Pollen is fairly abundant. Pollen grains are large sticky and heavy, usually with rough surfaces so that they can readily cling onto the insects bodies.
- 4.Stamens may not be pendulous.
- 5.Stigmas are usually not feathery and do no protrude. They are sticky
- so that pollen grains settling on them are not easily displaced.
- 6.Nectar guides may be seen on the petals.
Define the term hybrid vigour with reference to F1 hybrid seeds
- the result of genetic breeding where the dominant genes from one parent plant are used to suppress the undesirable recessive genes of the second parent plant.
- The resulting seedlings will be larger and stronger than either of the
- parents as well as generally showing better disease resistance.
Define the term tepals in a NAMED genus
- Tepals are elements of the perianth, or outer part of a flower, which include the petals or sepals.
- The term tepal is more often applied specifically when all segments of
- the perianth are of similar shape and color, or undifferentiated, which
- is called perigone.
Define anther AND stigma
- Anthers contain pollen sacs. The sacs release pollen on to the outside
- of the anthers that brush against insects on entering the flowers. The
- pollen once deposited on the insect is transferred to the stigma of another
- flower or the same flower. The ovule is then able to be fertilised
- The stigma Is
- covered in a sticky substance that the pollen grains will adhere to.
Describe the process of Osmosis
the tendency of a fluid, usually water, to pass through a semipermeable membrane into a solution where the solvent concentration is higher, thus equalizing the concentrations of materials on either side of the membrane.
Define the term "secondary thickening"
- The growth in width of stems and roots in
- plants, resulting in more thicker, sturdier tissues that can support the
- growing plant.