What is the meaning of stealth?

(Entry 1 of 2) 1 : a cautious, unobtrusive, and secretive way of moving or proceeding intended to avoid detection Makos, among the fastest of sharks, chase down their prey.

What does stealth like mean?

Stealth means sneakiness. When you do something with stealth, you do it so quietly and carefully that no one notices. You might admire the stealth of your cat when she sneaks up on a mouse. Stealth and steal come from the same root word and used to mean the same thing.

What is Estivation How is it similar to hibernation?

Estivation is very similar to hibernation, when some mammals spend the winter moving very little and sleeping a lot, in order to save energy. During estivation, animals become still and their breathing slows — but it occurs during the hottest months of the year.

What is a dormancy?

Dormancy is a period in an organism’s life cycle when growth, development, and (in animals) physical activity are temporarily stopped. This minimizes metabolic activity and therefore helps an organism to conserve energy. Dormancy tends to be closely associated with environmental conditions.

What are the types of dormancy?

Dormancy has a significant role in the development of new species and the successful dispersal of existing species [2]. There are two types of seed dormancy in general: seed coat (physical) dormancy and internal dormancy. In seed coat dormancy, the seed coat prevents oxygen and/or water permeating into the seed.

What causes dormancy to end?

When seeds have been exposed to low temperatures for long enough, a process called cold stratification triggers the conclusion of dormancy.

What causes dormancy?

The dormant state that is induced in an organism during periods of environmental stress may be caused by a number of variables. Those of major importance in contributing to the onset of dormancy include changes in temperature and photoperiod and the availability of food, water, oxygen, and carbon dioxide.

How do you overcome dormancy?

Treatments to Overcome Seed Dormancy

Mechanical Scarification.
Hot Water Scarification.
Drop into hot water (77 to 100oC), remove from heat, allow to cool and soak for 24 hours.
Acid Scarification.
Seeds, in small batches, are brought into contact with 93% Technical Grade sulphuric acid.
Warm Moist Scarification.

Is hibernation a form of dormancy?

Similarly, hibernation is a type of dormancy, but not all dormant animals hibernate. That’s because hibernation is a really specific kind of dormancy. Dormancy describes an animal that has slowed down its bodily functions for a little while, but hibernation has some very specific rules.

How do you break dormancy?

There are two methods to break the dormancy of chilling requiring seeds: (a) Stratification: The dormancy of chilling required seed is broken by stratification. Low temperature requirement given to the seeds to break their dormancy is called stratification. Dry seeds cannot be stratified.

What is the significance of cytokinin in breaking dormancy?

Cytokinins released by the endosperm appear to reduce the ion release from the aleurone in wheat in some way and to affect triglyceride metabolism in the aleurone layer (Eastwood and Laidman, 1971). Thus cytokinins may have a role similar to GA3.

What is the meaning of breaking of dormancy?

Commonly the embryo has no innate dormancy and will develop after the seed coat is removed or sufficiently damaged to allow water to enter. Germination in such cases depends upon rotting or abrasion of the seed coat in the soil.

What is dormancy what is its cause and what are the methods of breaking dormancy?

Seed dormancy can be defined as the state or a condition in which seeds are prevented from germinating even under the favourable environmental conditions for germination including, temperature, water, light, gas, seed coats, and other mechanical restrictions.

What are the five stages of germination?

The Seed Germination Process :

Imbibition: water fills the seed.
The water activates enzymes that begin the plant’s growth.
The seed grows a root to access water underground.
The seed grows shoots that grow towards the sun.
The shoots grow leaves and begin photmorphogenesis.

Which chemical is used to break seed dormancy?

Ethylene

What is the difference between dormancy and quiescence?

Q1: What is the difference between quiescence and dormancy? Quiescence is a state of suspended growth of the embryo, or a resting condition of the seed. Dormancy is a state that requires a special event or “trigger” before the embryo can resume growth, such as fire, scarification or cold treatment.

How long can a seed lay dormant?

When kept in proper storage condition, many seeds can stay dormant for years beyond their recommended used by date. But there are a couple of factors that play into the viability of your seeds: Age — All seeds are viable for at least a year, with many others viable for definitely two years.

What is after ripening?

After-ripening, i.e. a period of usually several months of dry storage at room temperature of freshly harvested, mature seeds, is a common method used to release dormancy and to promote germination (Bewley, 1997; Finch-Savage and Leubner-Metzger, 2006; Kucera et al., 2005; Leubner-Metzger 2003).

What are the important requirements for germination?

All seeds need water, oxygen, and proper temperature in order to germinate. Some seeds require proper light also. Some germinate better in full light while others require darkness to germinate. When a seed is exposed to the proper conditions, water and oxygen are taken in through the seed coat.

What are the 6 stages of germination?

For humans, the progression is infant, toddler, adolescent, young adult, middle aged adult, and senior citizen, while plants go from seed to sprout, then through vegetative, budding, flowering and ripening stages.

What are 3 factors that affect seed germination?

Environmental factors such as temperature, light, pH, and soil moisture are known to affect seed germination (Chachalis and Reddy 2000; Taylorson 1987).

What is not needed for germination?

Water, air and suitable temperature are necessary for seed germination. Water is necesssary for germination because food is stored in the seeds in dry condition, but the developing embryo cannot utilize this dry food. Food can be utilized in liquid form only and seeds can utilize only dissolved oxygen.

Is moisture needed for germination?

Moisture is critical for germinating seeds. They like a moist but not soggy environment. Seeds require oxygen and if kept in a waterlogged state may rot. On the other hand, if the soil dries out, the seed will lose whatever water it has absorbed and will die.