1. Which scenario is an example of seed quiescence? c The still-viable seed of a

Question

1. Which scenario is an example of seed quiescence? c The still-viable seed of a water-loving lotus plant has been buried in dry soils for c A wildflower seed is exposed to the correct temperature and moisture decades conditions for germination, but it does not germinate until it receives appropriate light-relatcd cus. A banana produces sterile fruit without first being pollinated. A juniper seed passes through the digestive tract of a bird to be deposited far from the c shade of its parent plant. A tomato seed does not generally germinate while still ttached to its parent plant. 2. Which statement about the dormancy of seeds is false? Light inhibits seed germination in some species. Seeds often break dormancy when still attached to the parent plant. Exposure of seeds to fire may break dormancy Soaking certain seeds in water promotes germination. Abrasion of the seed coat may break dormancy 3. Seeds undergo extensive cell division in the early stages of germination carry out extensive DNA synthesis in the initial stage of germination. take up water at the onset of germination. show a decrease in respiration as they germinate. carry out photosynthesis in the hypocotyl after germination 4. Based on its role in plant signaling, which substance is best described as a hormone? Auxin Zeaxanthin Phototropin Cryptochrome Phytochrome 5. A plant scientist exposes the seeds of a model organism such as Arabidopsis to mutagenic substances. She then treats the resulting seedlings with a specific hormone and looks for individual plants with a unique physiological response. DNA sequencing of these mutants can reveal the underpinning of signal transduction pathways. This type of study is called a(n genetic screen. aleurone layer. common garden experiment. cytochrome test. circadian rhythm.

Explanation / Answer

Ans-1-A

Quiescence is a state of suspended growth of the embryo by unfavourable environment (I.e. Exogenous ) condition and will resume growth at any time upon exposure to favorable conditions or seeds that delay germination for many months or years.

Ans-2-Seeds often break dormancy when still attached to the parent plant.

Seed dormancy is depends on factor within the seed itself and released by exposure to proper environmental conditions which breaks dormancy and allow germination.

Ans-3-take up water at the onset of germination

Hydration or imbibition is the condition where seed absorb water only if the seed coat are permeable. It triggers metabolic changes to begin growth.

Ans-4-auxin

Auxin is a plant hormones which involve in stem elongation, promotion of vascular tissue growth.

cytochrome are iron containing hemeproteins and Phytochrome is a photoreceptor,a pigment found in plants that allows the plants to detect of light

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