Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology plant growth and development other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Choose the correct answer from the alternatives given.
Spraying plants with a combination of auxins and gibberellins:

  1. promotes formation of parthenocarpic fruit

  2. kills broad-leaved dicot plants

  3. prevents senescence

  4. promotes fruit ripening
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When sprayed on flowers, any of the plant hormones gibberellin, auxin and cytokinin could stimulate the development of parthenocarpic fruit.

So, the correct option is 'promotes the formation of parthenocarpic fruit'.

Multiple choice biology plant growth and development other plant hormones cytokinins, ethylene and abscisic acid plant hormones

The hypothesis of algal origin of higher plants is based on which one of the following orders of Chiorophyta?

  1. Volvo ales

  2. Ultrichales

  3. Cladophorales

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

The hypothesis of the algal origin of higher plants (specifically the Charophyceae lineage) is often linked to the order Charales or related green algae, but Volvocales is sometimes cited in older or specific textbook contexts regarding colonial evolution.

Multiple choice biology plant growth and development other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Choose the correct answer from the alternatives given.
If a long-day plant has a critical night length of 9 hours then which of the following 24-hour cycles would prevent flowering:

  1. 16 hours light/8 hours dark

  2. 14 hours light/10 hours dark

  3. 4 hours light/8 hours dark/4 hours light/8 hours dark

  4. 8 hours light/8 hours dark/light flash/8 hours dark
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The critical photoperiod is the continuous duration of light which should not be exceeded in short day plants but should always be exceeded in long day plants. Here the critical night length for the long day plants are 9 hours which should more and the light phase should be smaller.

So, the correct option is '14 hours light/10 hours dark'.

Multiple choice biology plant growth and development other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Choose the correct answer from the alternatives given.
Bolting of floral shoots is triggered by a high concentration of:

  1. auxin

  2. gibberellins

  3. cytokinins

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

Gibberellins also promote bolting (internode elongation just prior to flowering) in beet, cabbages and many plants with rosette habit.

So, the correct option is 'gibberellins'.

Multiple choice biology plant growth and development other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Which of the following is true?

  1. Cytokinins helps in ripening of fruit.

  2. Gibberellins helps in ripening of fruit.

  3. Calcium carbide helps in ripening of fruit.

  4. Calcium carbonate helps in ripening of fruit.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Calcium carbide is used for ripening fruit artificially in some countries. When calcium carbide comes in contact with moisture, it produces acetylene gas, which is quite similar in reaction to the natural ripening agent ethylene.

Thus, the correct answer is option C.

Multiple choice biology plant growth and development other plant hormones cytokinins, ethylene and abscisic acid plant hormones

The weight of fruit in a plant by the number of dominant alleles of a certain number of genes. If seven weight categories are noticed, how many gene sites would be involved?

  1. Two

  2. Three

  3. Four

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

Genes are the chromosomal part that carries genetic information from one generation to another. Each gene has a pair of two contrasting alleles which is responsible for the effect of the gene in dominant and recessive traits. If seven characters of weight are there each will have two sites in the gene which shows recessive and dominant characters.

So, the correct option is 'Two'.

Multiple choice biology cell - the structure and functions cell as structural and functional unit introduction to cell discovery and cell theory cell discovery

Who applied the cell theory to plants?

  1. Schwann

  2. Schleiden

  3. Dutrochet

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

In 1838, German botanist, Matthias Schleiden found that all plant tissues are made up of cells which have been essentially similar structure. German zoologist, Theodor Schwann in 1839 working independently observed that animal cells do not have cell walls but are otherwise similar amongst themselves. He put forward cell hypothesis which states that bodies of animal and plants are made up of cells. Schleiden and Schwann in 1839 compared their findings and formulated cell theory.

Multiple choice biology cell - the structure and functions cell as structural and functional unit introduction to cell discovery and cell theory cell discovery

Who first proposed that new cells are formed by the division of preexisting cells?

  1. Rudolph Virchow

  2. W. Flemming

  3. Karl Nageli

  4. C.P. Swanson
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • By carefully observing the process of cell division, Rudolph Virchow in 1858, argued that cells only arose from the division of pre-existing cells.
Multiple choice biology biological molecules energy giving food carbohydrate and its test food and it's constituents

A reagent added to a sample shows change of colour from green to yellow. It is due to presence of reducing sugar. The test is

  1. Elisa test for detecting AIDS

  2. Benedict's test for detecting glucosuria

  3. Fehling's test for detecting hyperglycemia

  4. Ninhydrin test for detecting glucosidic linkage
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Benedict's test can be used to test reducing sugar that is glucose in urine. Glucose in urine is called glucosuria and it turns yellow in colour when benedict's test applied it shows that glucose is present in urine.
So the correct answer is B.