Biology · Environmental Studies

Plant Reproduction and Germination

835 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 biology life within the seed developmental journey of seed introduction to plant organs and germination seed to plants

During seed germination its stored food is mobilized by?

  1. Ethylene

  2. Cytokinin

  3. Abscisic acid

  4. Gibberellin
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Gibberellins invigorate the combination of α-amylase and proteases compound in germinating grains of oats. They are associated with the transformation of starch into sugar. The proteases convert an inert β-amylase to the dynamic frame. The dynamic β-amylase and α-amylase together process starch to glucose which is prepared to meet the metabolic requests of developing life. 

So, the correct option is 'Gibberellin'.

Multiple choice biology life within the seed developmental journey of seed introduction to plant organs and germination seed to plants

During which of the following stages of seed development, the production and storage of energy in mitochondria increases? 

  1. Seed germination

  2. Dormant seed

  3. Development of seeds

  4. Seed formation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Seed germination is a vitality requesting process that requires. while the mitochondrial mass increments amid interphase. It is suggested that the biogenesis of mitochondria amid germination begins from the advancement. 
Thus, the correct option is 'Seed germination.'
Multiple choice biology life within the seed developmental journey of seed introduction to plant organs and germination seed to plants

Formation of seeds without fertilisation can take place by all except.

  1. Germination of vegetative propagule

  2. Apogamy

  3. Diplospory

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

Apogamy, diplospory, and sporophytic budding are forms of apomixis, which is the formation of seeds without fertilization. Germination of a vegetative propagule is a method of vegetative reproduction, not seed formation.

Multiple choice biology life within the seed developmental journey of seed introduction to plant organs and germination seed to plants

When dry seeds are placed in wet soil 

  1. They absorb water

  2. They increase in size

  3. The hard seed coats get ruptured

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

When dry seeds are placed in wet soil they absorb water and increase in size because of this the hard seed coats get ruptured and process of germination of seed takes place.

Multiple choice biology life within the seed developmental journey of seed introduction to plant organs and germination seed to plants

In a seed of maize, scutellum is considered as cotyledon because it ________________.

  1. Protects the embryo

  2. Contains food for the embryo

  3. Absorbs food materials and supplies them to the embryo

  4. Converts itself into a monocot leaf
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The scutellum can also be considered in equivalence to thin cotyledon in monocots. It is very thin with a high surface area. It serves to absorb nutrients from the endosperm during germination. But it is not meant for protection of the embryo. Also, scutellum is not able to convert itself into a monocot leaf.

The option C is correct.

Multiple choice biology life within the seed developmental journey of seed introduction to plant organs and germination seed to plants

During germination, micropyle of seed takes part in

  1. Forming weak point for emergence of radicle

  2. Absorption of water

  3. Passage of gases

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

Micropyle is a narrow pore or passage formed by the projection of the integuments through which the pollen tube enters into ovule. Seeds contain micropyle through which water enters into the seed during germination.

So, the correct answer is 'Absorption of water'.

Multiple choice biology life within the seed developmental journey of seed introduction to plant organs and germination seed to plants

During seed germination, seed coat ruptures due to

  1. Differentiation of cotyledons

  2. Massive glycolysis in endosperm and cotyledons

  3. Massive imbition of water

  4. Sudden increase in cell division
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During the beginning stage of the germination, the seeds take up water rapidly and this results in swelling and softening of the seed coat at an optimum temperature. By rupturing of the seed coats helps to emerge the radicle and the plumule to form a primary root. This stage is referred to as an imbibition. So, the correct answer is 'Massive imbibition of water’.

Multiple choice biology life within the seed developmental journey of seed introduction to plant organs and germination seed to plants

Choose the correct statements

 For germination of angiospermic seeds ;
  1. On hydration the seed germinates showing increased enzyme activity
  2. Respiration rate of germinating seeds increases alongwith increased enzymatic activity
  3. Increase in respiratory rate continues till senescence
  4. Rate of enzymatic activity increases

  1. 1, 2, 3

  2. 1 and 2

  3. 2, 4

  4. 1 and 3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Seed germination is a fundamental process by which plant species grow from a single seed. One common example of seed germination is the sprouting of the seed of an angiosperm or gymnosperm. During its beginning stage, the seeds take up water for hydration. It is also used as a part of the aerobic respiration that also is a result of increased enzymatic activity.

The correct statements are 1 and 2 only.

The correct option is B.

Multiple choice biology life within the seed developmental journey of seed introduction to plant organs and germination seed to plants

Part of the seed which forms the shoot at the time of germination is

  1. Radicle

  2. Cotyledons

  3. Epicotyl

  4. Plumule
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A. Radicle- It is a embryonic root, which form root at the time of germination.

B. Cotyledons- It store reserve food materials or serve as photosynthetic organs in young seedling.
C. The upper portion of the axis above the cotyledons.
D. Plumule - It is a shoot tip which form shoot at the time of germination.
So, the correct answer is 'Plumule'.

Multiple choice biology life within the seed developmental journey of seed introduction to plant organs and germination seed to plants

After soaking the seeds overnight, these changes are seen in it 

  1. Stored food is digested to soluble form

  2. Physiological activity increases

  3. Imbibition of water occurs

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

When seeds soaked in water, water gets absorbed with increasing its volume, the physiological activity the seed also increases along with the metabolic activities and the food gets digested.

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

Multiple choice biology life within the seed developmental journey of seed introduction to plant organs and germination seed to plants

Freshly liberated seeds of Erianthus hiemalis do not germinate due to

  1. Occurrence of impermeable seed coat

  2. Immaturity of embryo

  3. Occurrence of inhibitors

  4. Absence of growth hormones
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Immaturity of embryo prevents germination of freshly liberated seeds of Erianthus hiemalis. 

So, the correct answer is 'Immaturity of embryo'