The number of electrons in the outermost shell of an atom determines its reactivity.
Primary succession is when, for example, a volcano explodes and there is nothing left and even the soil is ruined. It would take at least a hundred years for the land to be like it was before the volcano erupted. Secondary succession is when, for example, a wild fire happens but the soil is not ruined. It would take at least 25-50 years for the land to be like it was before the fire.
Answer:
The correct match is given below:
Explanation:
- A flower containing a pistil, stamen, calyx, and corolla – Complete flower. When a flower consists of essential whorls pistil and stamen and accessory whorls calyx and corolla, the flower is said to be complete.
- The collective term for the petals of a flower- Corolla. The corolla is a accessory whorl which consist s of its unit called petal.
- It has pistils, but no stamens - Female flower. A flower with only pistil is called unisexual pistillate flower.
- A stalk which supports the anther – Filament. A typical stamen consists of an anther, connective and a filament.
- A flower that lacks one or more of the following parts: pistil, stamen, calyx, or corolla corolla.—Incomplete flower. A flower which lacks any of the essential or accessory whorl is called incomplete flower.
- A flower that has male parts only – Male flower. A flower with only stamen is called unisexual staminate flower.
- A spore produced by meiosis – Meiospores. Spores can produced by mitosis or meiosis. If it is produced as a result of mitosis it is said to be mitospores.
Description of thigmotropism is given below.
Explanation:
1. Thigmotropism is a plant’s response to touch.It is a plant’s response to an external stimulus.It can occur quickly or slowly.Thigmotropism may involve the closing and opening of plant leaves.
2. Thigmonasty or thigmotropism can be define as the response of touch shown by the plants. Here, touch is the external stimulus. It can be define as the movement of the plant parts in response to the external stimulus that is contact or touch. It is also known as Haptotropism. The plant may change it's orientation, shape and size of the plant parts.
3,The thigmotropism can be positive or negative depending upon the visual response shown by the plants. The response shown by the plants is generally fast but may be slow. This response is shown by the plants in cases of danger of herbivory.Some plants like Mimosa pudica or touch me not plant shows thigmotropism by closing their leaves on touch
