The inflorescence of sunflower (Helianthus annuus L.) is heterogamous with zygomorphic ray flowers located in the outermost whorl of the head and actinomorphic disk flowers arrayed in arcs radiating from the center of the head.
- 1 Are sunflowers Actinomorphic?
- 2 Is ray florets of sunflower Zygomorphic?
- 3 Are sunflowers radial or bilateral?
- 4 Is Sunflower a complete flower?
- 5 What is an example of Zygomorphic flower?
- 6 Are orchids Actinomorphic?
- 7 What type of ovary is ray florets?
- 8 What is ray floret and disc floret?
- 9 What does the ray floret do?
- 10 What is the shape of sunflower?
- 11 Why are sunflowers Fibonacci?
- 12 Why are flowers symmetrical?
- 13 What kind of root system does sunflower have?
- 14 What is the order of a sunflower?
Are sunflowers Actinomorphic?
For example, in sunflower (Helianthus annuus L.), the wild-type (WT) inflorescence is composed of multiple whorls of actinomorphic (disc) florets surrounded by a single whorl of zygomorphic (ray) florets (Figure 1A and 1B; Figure S1).
Is ray florets of sunflower Zygomorphic?
There are two types of florets: (b) Ray florets – The flowers which are at the periphery. They are zygomorphic and asexual, hence are sterile.
Are sunflowers radial or bilateral?
The interesting thing about a sunflower is that it contains both radial and bilateral symmetry. What appear to be “petals” in the outer ring are actually small flowers, or ray florets, which are bilaterally symmetrical. The dark inner ring, on the other hand, is a cluster of radially symmetrical disk florets.
Is Sunflower a complete flower?
The sunflower is not a single flower at all, but a whole bouquet. They are “perfect” flowers, meaning that they have both male and female producing parts. To prevent inbreeding, the pollen producing structure (the anther) forms a tube around the style of the pistil.
What is an example of Zygomorphic flower?
The examples of the zygomorphic flowers are orchids, the plants belong to the family Lamiales, the flowers belong to the family of fabaceae or the leguminosae. The plants like green pea, soybean, lentil, beans, chickpea, pigeon pea, mung bean, peanut etc. belong to the family fabaceae having zygomorphic symmetry.
Are orchids Actinomorphic?
description. …it is termed regular or actinomorphic. A bilaterally symmetrical flower, as in orchids (see photograph) and snapdragons, is irregular or zygomorphic.
What type of ovary is ray florets?
Ray florets have inferior ovary and the reason is that the other parts of the flower are attached above the level of ovary. Example of such an ovary is ray florets of sunflower.
What is ray floret and disc floret?
Ray florets are ligulate and zygomorphic, with a showy corolla (petals) and aborted stamens, and play an important role in attracting pollinators. The central disc florets with fertile pollens are radially symmetrical and hermaphroditic, and are used for reproduction in chrysanthemum (Additional file 1).
What does the ray floret do?
The most common sunflower phenotype is a composite flower head that contains a single whorl of large, flattened, yellow ray florets on the outer perimeter and hundreds to over a thousand individual, tubular, disc florets that can produce seeds.
What is the shape of sunflower?
With its strong stature, its giant round shape and its brilliant yellow color, the sunflower truly looks like a droplet of golden sun. It’s no wonder its proper name, Helianthus anuus, comes from the Greek words “helios” (or “sun”) and “anthos” (or “flower”).
Why are sunflowers Fibonacci?
The individual seeds create spiral arms, curving to the right and the left. The number of spirals to the left, is however not equal to those spiraling to the right. These two numbers successive numbers in the Fibonacci sequence. Therefore, seeds in a sunflower follow the pattern of the Fibonacci sequence.
Why are flowers symmetrical?
A flower is considered symmetrical when each whorl consists of an equal number of parts or when the parts of any one whorl are multiples of that preceding it. Thus, a symmetrical flower may have five sepals, five petals, five stamens, and five carpels, or the number of any of these parts may be a multiple of five.
What kind of root system does sunflower have?
Sunflowers (Helianthus spp.) have a single taproot and smaller, hairy secondary roots. Sunflower roots usually grow 1 to 3 feet deep, and United States Department of Agriculture soil scientists have measured sunflower roots more than 5 feet long.
What is the order of a sunflower?
Fred is currently the only known male Sunflower in the series, as all others are depicted as female.