Tag: evs
Questions Related to evs
Choose the correct answer from the alternatives given.
The ripening of fruits can be accelerated by:
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artificially adding ethylene gas to the atmosphere surrounding them
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warming the surroundings artificially
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keeping the fruits in a refrigerator
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reducing water supply to the plant when the fruits are maturing
Ethylene is highly effective in fruit ripening. It enhances the respiration rate during ripening of the fruits.
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Oxygen, suitable temperature and water
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Good soil, suitable temperature and light
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Good soil, Water and Air
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All of the above
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.
Select the correct option:
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Water
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Heat
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Oxygen
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${CO} _{2}$
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 varieties of cotton do not attract bollworm?
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Hairy leaves
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Solid stem
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Smooth leaved and nector less
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High aspartic acid and low $N _2$ content
Heterophylly means
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Occurrence of different color of leaves in plant
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Occurrence of different size of roots in a plant
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Occurrence of more than one type of leaves
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All
Plants with both submerged and floating or emerged leaves show hetrophylly or occurrence of more than one type of leaves. Eg Ranunculus, Aquatilis
The leaf of Mimosa pudica is
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Simple
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Bifoliate
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Bipinnate
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Trifoliate
The leaf of Mimosa pudica is bipinnately compound. It contains leaflets arranged in opposite arrangement on the rachis. It has unipnnate leaves instead of single leaflets in the opposite direction on the rachis.