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

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

In ______________ seed germination epicotysis elongates and cotyledons lie below soil surface.

  1. Viviparous

  2. Hypogeal

  3. Epigeal

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In hypogeal germination, the epicotyl elongates rapidly while the hypocotyl remains short, causing the cotyledons to remain below the soil surface. Conversely, epigeal germination features hypocotyl elongation pushing cotyledons above ground.

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

A germinating mustard seed converts its lipids into sugars by _______________.

  1. TCA cycle

  2. Glyoxylate cycle

  3. Calvin cycle

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

Oilseeds convert stored lipids into sugars during germination via the glyoxylate cycle, a specialized pathway occurring in glyoxysomes that bypasses the decarboxylation steps of the TCA cycle.

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

Which of the following processes involved are true of the germinating seed?
a. Imbibitions of water
b. Evolution of oxygen
c. Synthesis of enzymes
d. Emergence of radical
Select the correct answer using the codes given.

  1. $1, 2$ and $3$
  2. $1, 3$ and $4$
  3. $2, 3$ and $4$
  4. $1$ and $2$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Seed germination involves water imbibition, activation and synthesis of hydrolytic enzymes, and eventual emergence of the radicle. Evolution of oxygen does not occur because germinating seeds consume oxygen for aerobic respiration and evolve carbon dioxide instead.

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

Which of the following statements about the hypocotyl hook is not true?

  1. It develops below the attachment of the cotyledons

  2. It is the first structure to emerge from a dicot seed

  3. It precedes the cotyledons and shoot apex up through the soil

  4. It straightens when exposed to light
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An embryo is a portion of a seed that grows into a plant. An embryo is a basic element that possesses enough potential for further growth and development. The part of a plant embryo or seedling that lies between the radicle and the cotyledons is the hypocotyl. Upon germination, the hypocotyl pushes the cotyledons above the ground to develop. It eventually becomes part of the plant stem. Most seed-bearing plants have hypocotyls.

So the correct option is 'It is the first structure to emerge from a dicot seed'.

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.'