What are the two whorls of sterile modified leaves?
The two outer whorls are sterile, the inner two fertile. The next two whorls, the androecium and the gynoecium, are composed of highly modified reproductive structures that have lost their leaf‐like appearance.
What is the function of whorls?
The outermost whorl of the flower has green, leafy structures known as sepals. The sepals, collectively called the calyx, help to protect the unopened bud. The second whorl is comprised of petals—usually, brightly colored—collectively called the corolla.
What are whorls in plants?
In botany, a whorl or verticil is an arrangement of leaves, sepals, petals, stamens, or carpels that radiate from a single point and surround or wrap around the stem or stalk. A leaf whorl consists of at least three elements; a pair of opposite leaves is not called a whorl.
What are the four modified leaf rings in a flower?
The flower is composed of four whorls of modified leaves, the calyx, corolla, androecium, and gynoecium.
Which whorl is responsible for photosynthesis?
A whorl of sepals (collectively called the calyx) is located at the base of the peduncle and encloses the unopened floral bud. Sepals are usually photosynthetic organs, although there are some exceptions.
What are the major whorls of a flower?
There are commonly four distinct whorls of flower parts: (1) an outer calyx consisting of sepals; within it lies (2) the corolla, consisting of petals; (3) the androecium, or group of stamens; and in the centre is (4) the gynoecium, consisting of the pistils.
What is the function of second whorl of flower?
Whorl #2: The Corolla The second whorl of the flower is the corolla, which is composed of the flower’s petals. The petals serve two purposes: to protect the reproductive organs of the flower and to attract pollinators.
What are the essential whorls of the flower?
The essential whorls of flower are androecium and gynoecium. These are the necessary whorls for reproduction in flowers since androecium produces pollen grains containing male gametes, whereas gynoecium produces ovules which are female gametes.
Which is the first whorl of flower?
The first two whorls of the flower – the calyx and the corolla – are collectively called the perianth.
Which whorls is responsible for photosynthesis?
What do you mean by essential whorls mention their functions?
Answer: accessory whorls: sepals(calyx)–protection of reproductive inner part of flower. petals(carolla)– To attract bees, butterfly etc insects for transfer of pollen grains. Essential whorls: Gynocium (female reproductive part) — and Androcieum (male reproductive part)– both take part in sexual reproduction.
Which is an example of a modification of a leaf?
For example, tendrils of peas, spines of cacti, onion bulb, leaves of insectivorous plants, etc. are different modified leaves. Let us have a detailed look at some of the modification of leaves:
How are leaves modified to trap small animals?
Leaves Modified to Trap Animals a Great Source of Nitrogen: Bladderwort: This flowering plant grows below the water and is greatly reduced. It is often mistaken for green algae. Its leaves entrap small animals such as Daphnia and even larval fish. Pitcher Plants: These are adapted for life in marshy/boggy nitrogen poor soil.
How are the leaves of a weak stemmed plant modified?
In weak- stemmed plants, leaf or a part of leaf gets modified into green threadlike structures called tendrils which help in climbing around the support. The parts of leaf which get modified into tendrils are as follows: (i) Entire Leaf is Modified into Tendril, e.g., Lathyrus aphaca (wild pea) (Fig. 4.19).
What are the functions of the leaves of a plant?
Primarily, leaves have two functions: photosynthesis and transpiration. In some plants, it takes up the responsibility of reproduction also. Let’s learn more about the morphology of leaves, parts of a leaf, different types of leaves and their modifications. Leaves are thin, flat organs responsible for photosynthesis in the plants.