Tag: evs

Questions Related to evs

Which part of the leaf is useful for exchanging gases between the plant and the atmosphere?

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

  1. Midrib

  2. Stomata

  3. Veins

  4. Petiole

Show answer
Correct Option: B
Explanation:

A)The midrib is the large strong the central vein in the middle of the leaf.
B)Stomata are the part of leaf present on the epidermis and help in the gaseous change.
C)Veins are the vascular tissue of leaf located at the mesophyll part.
D)The petiole is the part of a leaf that joins the lamina to the base.
So the correct option is 'Stomata'

Which one of these is not a part of a leaf?

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

  1. Midrib

  2. Lamina

  3. Leaf Base

  4. Stamen

Show answer
Correct Option: D
Explanation:

A) The midrib is the large strong central vein in the middle of the leaf.
B) The lamina is the broad green part of the leaf in which photosynthesis takes place.
C) Leaf base is the lowermost part of the leaf from where it attaches to stem or branch.
D) Stamen is the male reproductive part present on a flower.
So the correct option is 'Stamen'.

A gas which assists in germination of pea seed is 

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

  1. Sulphur

  2. Oxygen

  3. Hydrogen

  4. None of the above

Show answer
Correct Option: B
Explanation:

Germination of seed require a lot of energy and the rate of respiration increases and need of oxygen also increases as the metabolic rate is very high at this time.

So the correct option is 'Oxygen'.

An albuminous seed which shows hypogeal germination is

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

  1. Castor

  2. Maize

  3. Gram

  4. Bean

Show answer
Correct Option: B
Explanation:
Hypogeal germination is the type of germination in which epicotyl which is the upper portion of the axis of the seedlings above the cotyledons elongates and cotyledons remain inside the soil. The examples are a pea, mango, maize, rice etc. In which maize has endosperm.
 So the correct option is 'Maize'.

Which of the following substances present in seed coats and cotyledons of seeds inhibit seed germination?

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

  1. Absicic acid

  2. Phenolic acid

  3. Ferulic acid

  4. All of the above

Show answer
Correct Option: D
Explanation:
  • Germination is the process by which an organism grows from a seed or similar structure. 
  • The most common example of germination is the sprouting of a seedling from a seed of an angiosperm or gymnosperm.substances present in seed coats and cotyledons of seeds inhibit seed germination are Abscisic acid, Phenolic acid and Ferulic acid. 
  • Abscisic acid (ABA) reversibly arrests embryo development at radicle, growth initiation, inhibiting the water uptake which accompanies embryo growth.
  • Hence,  substances present in seed coats and cotyledons of seeds inhibit seed germination is  Abscisic acid, Phenolic acid and Ferulic acid.
  • So, the correct answer is 'All of the above'.

Essential requirements of seed germination is ..........................

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

  1. Light and carbondioxide

  2. Water and oxygen

  3. Water and soil

  4. Microbes cold or hot treatment.

Show answer
Correct Option: B
Explanation:

At a basic level, seeds have three requirements to permit germination. These are:

  1. Water (during absorption and subsequent stages of growth).
  2. Oxygen (for respiration).
  3. Temperatures adequate for metabolism and growth.

All of the following statements about the role played by water in the growth of plants are true, except

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

  1. It is a solvent in which several substances are dissolved.

  2. It participates as a reagent in many reactions.

  3. It helps in the germination of seeds but does not provide turgidity to growing cells.

  4. It serves as the medium for transport of inorganic salts.

Show answer
Correct Option: C
Explanation:
Water, being the universal solvent helps in germination of seeds and provide turgidity to growing cells. Turgidity or turgidness, is caused by the osmotic flow of water from an area of low solute concentration outside of the cell into the cell's vacuole, which has a higher solute concentration. Healthy plant cells are turgid and plants rely on turgidity to maintain rigidity. 
Refer the picture for turgidity in plant cells.
Role of water in plant growth:
  • Primary component of photosynthesis and transpiration.
  • Turgor pressure (pressure to inflate cells and hold plant erect).
  • Solvent to move minerals from the soil up to the plant.
  • Solvent to move products of photosynthesis throughout the plant, including down to the root system.
  • Regulation of stomatal opening and closure, thus regulating transpiration and photosynthesis.
  • Source of pressure to move roots through the soil.
  • Medium for biochemical reactions.
Hence, the correct answer is option C.

Oxygen in the presence of enough moisture causes ____ to start. This creates ____ for the germination process.

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

  1. Respiration, energy

  2. Photosynthesis, energy

  3. development, growth

  4. photosynthesis, growth

Show answer
Correct Option: A
Explanation:

Oxygen is one of the factors that play an important role in the germination of seeds. Oxygen in the presence of enough moisture causes respiration to start. This creates energy for the germination process.

Which of the following is not an important condition needed for seeds to germinate?

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

  1. Temperature

  2. Water

  3. Light

  4. None of the above

Show answer
Correct Option: D
Explanation:

Germination may also be defined as protrusion of embryonic axis from the seed to resume growth. The external factors that affect seed germination are as follows:

(1) Temperature- The effect of temperature is primarily on the physiological processes going on within the seed during germination. Many seeds fail to germinate at lower temperature.
(2) Water- The first step in germination is the imbibition of water. It causes the seed to swell and facilitates bursting of the seed coat.

(3) Light- There are many seeds which respond to light for germination and these are said to be photoblastic. The quality of light also influences the rate of germination. 
Thus temperature, water, and light all are important conditions needed for seeds to germinate. Hence option D is the correct answer. 

Seasonal growth cycle of plants can be influenced by

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

  1. Temperature

  2. Amount of water

  3. Amount of daylight

  4. All of the above

Show answer
Correct Option: D
Explanation:
The growth cycle in plants shows seasonal variations. Plants are of various types such as annuals, biennials and perennials. Also, the vegetative and reproductive growth of plants depends upon factors such as temperature, water availability and the amount of day light they are exposed to. Accordingly, there are short day, long day and day neutral plants.
So, the correct answer is, 'All of the above'.