Tag: seed becomes plant
Questions Related to seed becomes plant
What is true about phytochrome?
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${P} _{r}$ absorbs red light and becomes ${P} _{fr}$
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${P} _{r}$ absorbs yellow light and becomes ${P} _{fr}$
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${P} _{fr}$ absorbs yellow light and becomes ${P} _{r}$
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${P} _{fr}$ absorbs red light and becomes ${P} _{r}$
Phytochrome is a pigment found in plants which is involved in various plant processes like seed germination. Seed germination requires sufficient amount of P$ _{pr}$. P$ _r$ is synthesized by germinating seeds and is converted to P$ _{pr}$ when exposed to red light. However, when seeds are exposed to far-red light, they will not germinate as P$ _{pr}$ is converted to P$ _r$.
Light inhibits seed germination of
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Lactuca
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Capsella
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Allium
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Tobacco
Germination of most of the seed is under the control of light. Usually, red light induces seed germination whereas far-red light suppresses germination. However, light inhibits seed germination of Mediterranean plants like Allium. It usually grows as crowded vegetation and germination take place in dark condition.
Which of the following is an example of Negative Photoblastic seed?
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Onion
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Lily
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Nigella
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All of the above
Negative photoblastic seeds are those seeds which are able to grow in dark and while light inhibits their growth and seed is unable to come out from underground. Plants like onion, lily, and nigella re of such type.
The main function of cotyledons in a seed is to
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provide protection to the radicle and plumule
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help in seed germination
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supply food, to the young embryo
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store food materials
A cotyledon is part of the embryo within the seed of a plant. Often when the seed germinates or begins to grow, the cotyledon may become the first leaves of the seedling. contains protein, fats, and starches which provide energy for the developing seedling. The cotyledons provide a similar function. These are the seed leaves and they also contain storage of food for the developing plant. The cotyledons in some cases are major photosynthetic producers during germination.
Which of the following is the vegetative part of Jasmine plant?
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Stem
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Root
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Flower
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Leaf
Jasmine grows from their branches cut and planted by the branch touching the soil developing roots and growing into a separate plant independent of the mother plant.
Asexual reproduction is related to
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Amphimixis
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Agamospermy
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Vegetative propagation
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Both B and C
Flowering plants are called as
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Angiosperms
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Gymnosperms
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Ferns
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Mosses
Why seed dispersal is important?
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Survival of plant
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Introduction of plant
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Adaptation of plant
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None of these
- Dispersal of seed is important as if seeds germinate near to parent plants it will increase a lot of competition for air, water, and food as well.
- If competition increases it will lead to the death of the species and dispersal also leads to exposure to a new environment that helps in adaptation and evolution.
Seeds tarvel with water is filled with
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Water
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Air
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Protein
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None of the above
Seeds that travel in water is modified certain mechanism that make them light and filled with air so that they are able to travel a long distance and reach to places that are far from the parents. Its best example is the modification of mesocarp of coconut that helps it in hydrochory and able it to float a long distance.
Which of the following is correct for r-selected spices?
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Large number of progeny with small size
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Large number of progeny with large size
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Small number of progeny with small size
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Small number of progeny with large size
In r selected species the populations have a large number of offsprings while in k-selected species, the populations have a small number of offsprings. However, the offspring size in k-selected species is larger than that of r-selected species.