Life within the seed - class-VI

Sprouts develop in the pulses or grain under humid environment with adequate amount of water fasten the process of germination and Roots comes out.

Germination is the process of seeds developing into new plants. First, environmental conditions must trigger the seed to grow.

Aerobic respiration is respiration which occurs in the presence of oxygen. Aeration is the main phenomenon which helps in the germination of seed. Oxygen is absorbed by the cells which later gets transformed into energy for future uses. For better germination of seeds require oxygen, water, sunlight, and temperature.

In summary, seed germination is the process of a fertilized plant ovary, or seed, developing into a mature plant. Seed germination starts with imbibition when the seed takes in water from the soil. This triggers root growth to allow the seed to get more water.

TTC (2,3,5-triphenyl tetrazolium chloride) is a chemical used to test seed viability by staining living tissues red. While GA (gibberellic acid) is used to break dormancy, TTC is the standard chemical reagent associated with seed testing protocols.

In cereals like wheat and rice, the fruit is a caryopsis, where the pericarp (fruit wall) is fused with the seed coat (testa). This makes the grain a single-seeded fruit.

For the development of any seedling or plants, both light and dark phases are required for proper growth. The seedlings that are growing requires light as the carbon sources in them and the other nutrients are present in its complete amount but when they are placed in the darkness they are unable to perform certain functions so there is less production of nutrients resulting in lower fresh weight. Thus, the light phase is the phase on which growth of the plant is dependent upon. 

Spermatophytes are seed-bearing plants. Eucalyptus is an angiosperm (flowering plant) and Wolffia is an angiosperm; both produce seeds but do not produce cones, as cones are characteristic of gymnosperms like Pinus and Cycas.

Gibberellins invigorate the combination of α-amylase and proteases compound in germinating grains of oats. They are associated with the transformation of starch into sugar. The proteases convert an inert β-amylase to the dynamic frame. The dynamic β-amylase and α-amylase together process starch to glucose which is prepared to meet the metabolic requests of developing life. 

Apogamy, diplospory, and sporophytic budding are forms of apomixis, which is the formation of seeds without fertilization. Germination of a vegetative propagule is a method of vegetative reproduction, not seed formation.

When dry seeds are placed in wet soil they absorb water and increase in size because of this the hard seed coats get ruptured and process of germination of seed takes place.

In angiosperms, cotyledons are embryonic leaves. Embryo also has radicle and plumule which gives rise to root and shoot respectively.

Vegetative reproduction is asexual type of reproduction Potato, Sugarcane, Apple, etc., are multiplied by asexual means.

The scutellum can also be considered in equivalence to thin cotyledon in monocots. It is very thin with a high surface area. It serves to absorb nutrients from the endosperm during germination. But it is not meant for protection of the embryo. Also, scutellum is not able to convert itself into a monocot leaf.

The option C is correct.

Gibberellin is a plant hormone which breaks the seed dormancy. Before the germination, starch nourishes seedling. It stimulates the synthesis of digestive enzymes like amylase in the aleurone cells of certain cereals. Amylase hydrolyzes starch into glucose which is used to provide nourishment to the seed embryo. 

Micropyle is a narrow pore or passage formed by the projection of the integuments through which the pollen tube enters into ovule. Seeds contain micropyle through which water enters into the seed during germination.

During the beginning stage of the germination, the seeds take up water rapidly and this results in swelling and softening of the seed coat at an optimum temperature. By rupturing of the seed coats helps to emerge the radicle and the plumule to form a primary root. This stage is referred to as an imbibition. So, the correct answer is 'Massive imbibition of water’.

Seed germination is a fundamental process by which plant species grow from a single seed. One common example of seed germination is the sprouting of the seed of an angiosperm or gymnosperm. During its beginning stage, the seeds take up water for hydration. It is also used as a part of the aerobic respiration that also is a result of increased enzymatic activity.

The correct statements are 1 and 2 only.

The correct option is B.

A. Radicle- It is a embryonic root, which form root at the time of germination.

In some seeds, the nucellus persists as a nutritive tissue called the perisperm. This is common in seeds like black pepper and beet.

An embryo is a portion of a seed that grows into a plant. An embryo is a basic element that possesses enough potential for further growth and development. The part of a plant embryo or seedling that lies between the radicle and the cotyledons is the hypocotyl. Upon germination, the hypocotyl pushes the cotyledons above the ground to develop. It eventually becomes part of the plant stem. Most seed-bearing plants have hypocotyls.

When seeds soaked in water, water gets absorbed with increasing its volume, the physiological activity the seed also increases along with the metabolic activities and the food gets digested.

Immaturity of embryo prevents germination of freshly liberated seeds of Erianthus hiemalis. 

The radicle is the first part of a seedling to emerge from the seed during the process of germination. It is the embryonic root of the plant and grows downward in the soil.

Seed germination requires oxygen for cellular respiration, an adequate temperature for enzymatic activity, and water for metabolic activation and imbibition.