Biology · Environmental Studies

Plant Reproduction and Germination

892 Questions

Plant reproduction and germination involve seed structure, cotyledon function, and dispersal mechanisms. These core botany concepts frequently appear in general science sections. Practice these questions to ensure better retention.

Seed germination typesSeed dispersal mechanismsCotyledons and albuminous seedsCryptogamic plantsPhanerogams reproduction

Plant Reproduction and Germination Questions

Multiple choice evs seed becomes plant germination of seed seed germination journey of seed

Seeds placed deep in the soil do not germinate because they are

  1. Unable to get sufficient oxygen

  2. Without sufficient food to bring the seedling to the surface

  3. Under pressure of overlying soil layers

  4. Unable to get light
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

During germination rapid cell division takes place. Energy is required for cell division. This energy is obtained from oxidation. The oxygen required for oxidation is supplied by the air. So, air is necessary for seed germination. Seeds placed deep in the soil do not germinate because they are unable to get sufficient oxygen. So, the correct answer is 'Unable to get sufficient oxygen'.

Multiple choice evs seed becomes plant germination of seed seed germination journey of seed

Freshly shed seeds can germinate immediately under favourable conditions in

  1. <p>Xanthium</p>

  2. <p>Pisum sativum</p>

  3. <p>Zea mays</p>

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A. Xanthium has seed dormancy due to present of germination inhibitors like abscisic acid, phenolic acid, ferulic acid, coumarin, short fatty acids and cyanogenic chemicals. So, it  won’t germinate in the presence of favorable condition.

B. Pisum sativum- Don’t have germination inhibitors. So, it germinate in the presence of favorable condition.


C. Zea mays- Don’t have germination inhibitors. So, it germinate in the presence of favorable condition.

So, the correct answer is ‘Both B and C’.

Multiple choice evs seed becomes plant germination of seed seed germination journey of seed

Which are the external conditions required for seed germination?

  1. Oxygen, carbon dioxide and suitable temperature

  2. Oxygen, light and suitable temperature

  3. Light, moisture and suitable temperature

  4. Oxygen, moisture and suitable temperature
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Conditions necessary for germination: Water, air and suitable temperature are necessary for seed germination.

Water is necesssary for germination because food is stored in the seeds in dry condition, but the developing embryo cannot utilize this dry food. Food can be utilized in liquid form only and seeds can utilize only dissolved oxygen. Excess water stops germination because once all the dissolved oxygen is utilised by the seed, further germination is not possible as the life supporting oxygen is now lacking.

During germination rapid cell division takes place. Energy is required for cell division. This energy is obtained from oxidation. The oxygen required for oxidation is supplied by the air. So, air is necessary for seed germination.

Suitable temperature is necessary because low temperature retards the embryo activity and high temperature destroys the delicate embryo tissue. 

So, the correct answer is 'Oxygen, moisture and suitable temperature'

Multiple choice evs seed becomes plant germination of seed seed germination journey of seed

A seed which is unable to germinate in the presence of light is ___________.

  1. Viscum

  2. Onion

  3. Bean

  4. Maize
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Onion seeds are known to be negatively photoblastic, meaning their germination is inhibited by light. Other options like bean and maize are generally indifferent to light.

Multiple choice evs seed becomes plant germination of seed seed germination journey of seed

Which one is essential for good germination in pea?

  1. $ O _2 $
  2. $ H _2 $
  3. $ N _2 $
  4. $ CO _2 $
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Air (oxygen) is necessary for seed germination(Pea seed). During germination rapid cell division takes place. Energy is required for cell division. This energy is obtained from oxidation. The oxygen required for oxidation is supplied by the air. So, air is necessary for seed germination. So, the correct answer is ‘Oxygen’.

Multiple choice evs seed becomes plant germination of seed seed germination journey of seed

A gas required for germination of (pea) seed is

  1. Nitrogen

  2. Oxygen

  3. Hydrogen

  4. Water vapours
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Air (oxygen) is necessary for seed germination (pea seed). During germination rapid cell division takes place. Energy is required for cell division. This energy is obtained from oxidation. The oxygen required for oxidation is supplied by the air. So, air is necessary for seed germination. So, the correct answer is ‘Oxygen’.

Multiple choice evs seed becomes plant germination of seed seed germination journey of seed

Which is not essential for seed germination in most cases?

  1. Oxygen

  2. Light

  3. Suitable temperature

  4. Moisture
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Water, air and suitable temperature are necessary for seed germination. Water is necesssary for germination because food is stored in the seeds in dry condition, but the developing embryo cannot utilize this dry food. Food can be utilized in liquid form only and seeds can utilize only dissolved oxygen. Excess water stops germination because once all the dissolved oxygen is utilised by the seed, further germination is not possible as the life supporting oxygen is now lacking. During germination rapid cell division takes place. Energy is required for cell division. This energy is obtained from oxidation. The oxygen required for oxidation is supplied by the air. So, air is necessary for seed germination. Suitable temperature is necessary because low temperature retards the embryo activity and high temperature destroys the delicate embryo tissue. So, the correct answer is 'Light'.

Multiple choice evs seed becomes plant germination of seed seed germination journey of seed

Essential requirement for seed germination is

  1. ${O} _{2}$ and light
  2. ${H} _{2}O$ and ${O} _{2}$
  3. ${H} _{2}O$ and high temperature

  4. Scarification and vernalisation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The process of seed germination depends on many factors like temperature, water, oxygen and sometime light. Seeds usually germinate within a wide temperature range. Hence, essential requirement for seed germination to take place is water and oxygen. Germination cannot take place without sufficient supply of water. In presence of sufficient moisture, water is taken up by seed. Oxygen is essential for aerobic respiration. 

Thus, the correct answer is option B.

Multiple choice evs seed becomes plant germination of seed seed germination journey of seed

Seeds which do not germinate in the dark are called as

  1. Positive photoblastic

  2. Negative photoblastic

  3. Non-photoblastic

  4. None of the aboove
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Positive photoblastic seeds require white light to germinate in dark the growth does not occur. this response is controlled by phytochromes and includes the plants like mango, wheat etc.

So the correct option is 'Positive photoblastic'.

Multiple choice evs seed becomes plant germination of seed seed germination journey of seed

During the germination of pulse seeds, the major food reserves are degraded by the activity of __________.

  1. Amylase

  2. Lipase

  3. Protease

  4. Cellulose
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pulse seeds are rich in starch. During germination, the enzyme amylase breaks down these starch reserves into simpler sugars to provide energy for the growing embryo.

Multiple choice evs seed becomes plant germination of seed seed germination journey of seed

The period of rapid starch formation and decrease in sugar in developing seeds is associated with a marked increase in.

  1. Phosphorylase

  2. Phosphates

  3. Alpha amylase

  4. Hexokinase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Phosphorylase is the enzyme responsible for the reversible conversion of starch to glucose-1-phosphate, playing a key role in starch synthesis and degradation in developing seeds.

Multiple choice evs seed becomes plant germination of seed seed germination journey of seed

Vivipary may be described as

  1. Germination of seed with cotyledons above the soil

  2. Germination of seed with cotyledons under the soil

  3. Formation of a fruit without pollination

  4. Development of a seedling within an attached fruit
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Vivipary is a condition where the embryo derives nutrition from the parent and is attached it attains maturity. In plants, vivipary refers to the development of a seedling within an attached fruit so that the seedling can derive nutrition.

So, the correct answer is 'Development of a seedling within an attached fruit'

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

  1. Oxygen, suitable temperature and water

  2. Good soil, suitable temperature and light

  3. Good soil, Water and Air

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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'

Multiple choice evs seed becomes plant germination of seed seed germination journey of seed

Select the correct option:


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

  1. Water

  2. Heat

  3. Oxygen
  4. ${CO} _{2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.