Tag: developmental journey of seed

Quizzes (3) Questions (50)

Questions Related to developmental journey of seed

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’.

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'.