Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology animal physiology sexual reproduction in flowering plants reproduction - the generating system reproduction

Choose the correct answers from the alternatives given.
The development of a sporophyte from the moss gametophyte without sexual fusion is
called:

  1. apomoxis

  2. apogamy

  3. apospory

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

Apogamy is the development of a sporophyte directly from a gametophyte without sexual fusion (syngamy). Apospory is the reverse, where a gametophyte develops from a sporophyte without meiosis.

Multiple choice biology constitutes of diet nutrients and foodstuffs simple test for nutrients test for nutrients

A green leaf is partially covered and placed in the light for several days. If it is then boiled and tested for starch with iodine, what will be the result? 

  1. Starch will be found only in the part of the leaf exposed to light

  2. Starch will be found in the entire leaf

  3. Starch will be found only in the shaded part of the leaf

  4. Starch will not be found in the leaf at all
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A green leaf is partially covered and placed in the light for several days. If it is then boiled and tested for starch with iodine starch will be found only in the part of the leaf exposed to light. This is because starch is the end product of photosynthesis. The process of photosynthesis will take place only in the location of leaves where light is present. 

In the given question, the leaf is partially covered which means, no photosynthesis takes place in these areas. Thus, when iodine is introduced to these parts after boiling, it cannot give blue-black color. Whereas the other parts which were exposed to sunlight will give blue-black color.
So, the correct answer is option A.

Multiple choice biology constitutes of diet nutrients and foodstuffs simple test for nutrients test for nutrients

The presence of starch in leaves can be tested with

  1. Iodine solution.

  2. Copper sulphate solution.

  3. Lime water.

  4. Benedict's solution.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Starch is an important food reserve present in the leaf of the plant. The Iodine test is used to test for the presence of starch. Iodine solution where the iodine dissolved in an aqueous solution of potassium iodide reacts with the starch, producing a purple-black color.

So, the correct answer is option A.

Multiple choice biology breathing and respiration regulation of breathing human respiratory system contro and disorders of respiration

Much developed larynx of human male is called as

  1. Aristole's lanttern

  2. Syrinx

  3. Adam's apple

  4. Muller's organ
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The laryngeal prominence (commonly referred to as Adam's apple), a feature of the human neck, is the lump or protrusion that is formed by the angle of the thyroid cartilage surrounding the larynx. The structure of the laryngeal prominence forms a bump under the skin. It is larger in adult men, in whom it is usually clearly visible and palpable. In women, the bump is much less visible and is hardly perceived on the upper edge of the thyroid cartilage. The laryngeal prominence is related to the deepening of the voice.

Multiple choice biology breathing and respiration regulation of breathing human respiratory system contro and disorders of respiration

Name the respiratory organ which is known as voice box. 

  1. Pharynx

  2. Vocal cords

  3. Trachea

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

The larynx is known as voice box or sound producing organ. A pair of membranous folds called vocal cords, stretch across the laryngeal cavity. In normal condition, the vocal cords lie apart so that the glottis remains widely open to allow free passage of respiratory air. For sound production, vocal cords come close together, they vibrate when air rushes out through glottis and produce voice.

Multiple choice biology plant growth seed dormancy fruit plants: structure and function

The cause of dormancy for sometime in fertilized ovule is 

  1. Presence of Auxin hormone

  2. Zygote divides only after certain amount of endosperm is formed

  3. Presence of growth inhibitor ABA

  4. Presence of least amount of water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The fertilized ovule is got dormant so that the adequate amount of endosperm is formed as for division and for further survival, it is very necessary that ample amount of food is present in the seed.

So the correct option is 'Zygote divides only after a certain amount of endosperm is formed'.

Multiple choice biology plant growth seed dormancy fruit plants: structure and function

Which of the following breaks the dormancy of potato tubes?

  1. IAA

  2. ABA

  3. Zeatin

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

Dormancy of seeds could be broken by the activation of digestive enzymes like alpha amylases. It is being done by phytohormones like gibberellic acid. It also helps in cell elongation, division of lateral meristem and many more.

Multiple choice biology plant growth seed dormancy fruit plants: structure and function

Seed dormancy is due to the : -

  1. Ethylene

  2. Abscissic acid

  3. IAA

  4. Starch
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Seed dormancy is defined as a state in which seeds are prevented from germinating even under environmental conditions normally favorable for germination. The sesquiterpene abscisic acid (ABA) regulates many processes during the plant life cycle, including key events during seed formation, such as the deposition of storage reserves, prevention of precocious germination, the acquisition of desiccation tolerance, and the induction of primary dormancy.

So, the correct answer is 'Abscissic acid'.