Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

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

Assertion : The two cotyledons in seed are embryonic leaves.

Reason : The embryo contains radicle and plumule.

  1. Both assertion and reason are true and reason is a correct explanation of the assertion.

  2. Both assertion and reason are true but reason is not a correct explanation of the assertion.

  3. Assertion is true but Reason is false

  4. Both Assertion and Reason are false

  5. Assertion is false but Reason is true
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In angiosperms, cotyledons are embryonic leaves. Embryo also has radicle and plumule which gives rise to root and shoot respectively.

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

Assertion : Many plants are propagated vegetatively even through they bear seeds.

Reason : Potatoes multiply by tubers, apple by cutting.

  1. Both assertion and reason are true and reason is a correct explanation of the assertion.

  2. Both assertion and reason are true but reason is not a correct explanation of the assertion.

  3. Assertion is true but Reason is false

  4. Both Assertion and Reason are false

  5. Assertion is false but Reason is true
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Vegetative reproduction is asexual type of reproduction Potato, Sugarcane, Apple, etc., are multiplied by asexual means.

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

At the time of seed germination, digestive enzymes are induced to be formed under the influence of

  1. Cytokinin

  2. Gibberellins

  3. Ethylene

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

Gibberellin is a plant hormone which breaks the seed dormancy. Before the germination, starch nourishes seedling. It stimulates the synthesis of digestive enzymes like amylase in the aleurone cells of certain cereals. Amylase hydrolyzes starch into glucose which is used to provide nourishment to the seed embryo. 

Thus, the correct answer is option B.

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’.