Tag: evs

Questions Related to evs

Choose the correct answer from the alternatives given.
The ripening of fruits can be accelerated by:

evs seed becomes plant germination of seed seed germination journey of seed

  1. artificially adding ethylene gas to the atmosphere surrounding them

  2. warming the surroundings artificially

  3. keeping the fruits in a refrigerator

  4. reducing water supply to the plant when the fruits are maturing

Show answer
Correct Option: A
Explanation:

Ethylene is highly effective in fruit ripening. It enhances the respiration rate during ripening of the fruits. 

So, the correct option is 'artificially adding ethylene gas to the atmosphere surrounding them'.

The three conditions necessary for germination of seeds are 
evs seed becomes plant germination of seed seed germination journey of seed

  1. Oxygen, suitable temperature and water

  2. Good soil, suitable temperature and light

  3. Good soil, Water and Air

  4. All of the above

Show answer
Correct Option: D
Explanation:

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. 

Hence, the correct answer is 'All of the above'

Select the correct option:


The respiration in germinating seeds produces energy which can be detected in the form of ___________.

evs seed becomes plant germination of seed seed germination journey of seed

  1. Water

  2. Heat

  3. Oxygen

  4. ${CO} _{2}$

Show answer
Correct Option: B
Explanation:
During germination, the respiration rate of seed is very high which releases a very high amount of energy and around 30 to 40% of energy is converted into ATP and utilize by the plant for its growth and rest is evolved in the form of heat which can be detected.
So the correct option is 'Heat'.

What is true about phytochrome?

evs seed becomes plant germination of seed seed germination journey of seed

  1. ${P} _{r}$ absorbs red light and becomes ${P} _{fr}$

  2. ${P} _{r}$ absorbs yellow light and becomes ${P} _{fr}$

  3. ${P} _{fr}$ absorbs yellow light and becomes ${P} _{r}$

  4. ${P} _{fr}$ absorbs red light and becomes ${P} _{r}$

Show answer
Correct Option: A
Explanation:

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$.

Thus, the correct answer is option A.

Light inhibits seed germination of

evs seed becomes plant germination of seed seed germination journey of seed

  1. Lactuca

  2. Capsella

  3. Allium

  4. Tobacco

Show answer
Correct Option: C
Explanation:

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.

Thus, the correct answer is option C.

Which of the following is an example of Negative Photoblastic seed?

evs seed becomes plant germination of seed seed germination journey of seed

  1. Onion

  2. Lily

  3. Nigella

  4. All of the above

Show answer
Correct Option: D
Explanation:

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.

So the correct option is 'All of the above'.

The main function of cotyledons in a seed is to

evs seed becomes plant germination of seed seed germination journey of seed

  1. provide protection to the radicle and plumule

  2. help in seed germination

  3. supply food, to the young embryo

  4. store food materials

Show answer
Correct Option: B
Explanation:

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. 

So, the correct option is, 'help in seed germination'.

Which of the following varieties of cotton do not attract bollworm?

evs roots and leaves plant adaptation and modification leaves root, stem, and leaves

  1. Hairy leaves

  2. Solid stem

  3. Smooth leaved and nector less

  4. High aspartic acid and low $N _2$ content

Show answer
Correct Option: A

Heterophylly means 

evs roots and leaves plant adaptation and modification leaves root, stem, and leaves

  1. Occurrence of different color of leaves in plant

  2. Occurrence of different size of roots in a plant

  3. Occurrence of more than one type of leaves

  4. All

Show answer
Correct Option: C
Explanation:

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

evs roots and leaves plant adaptation and modification leaves root, stem, and leaves

  1. Simple

  2. Bifoliate

  3. Bipinnate

  4. Trifoliate

Show answer
Correct Option: C
Explanation:

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.

Thus, the correct answer is 'Bipinnate.'