Tag: biotechnology

Quizzes (4) Questions (393)

Questions Related to biotechnology

Multiple choice botany plant breeding method of plant breeding for crop improvement plant breeding for food production biotechnology

From which technique, new and better varieties of crop plants are formed

  1. Selection

  2. Hybridisation

  3. Grafting

  4. Hybridisation followed by selection.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plant breeding typically involves hybridizing parents with desirable traits, followed by the selection of the best offspring from the resulting population to stabilize those traits.

Multiple choice botany plant breeding method of plant breeding for crop improvement plant breeding for food production biotechnology

During hybridisation, offspring with hybrid vigour superior to both parents are self pollinated for a few successive generations to .............

  1. Retain their parental characters

  2. Remove their parental characters

  3. Get homozygosity

  4. Segregate characters.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Self-pollination of hybrid offspring over several generations leads to the segregation of alleles and an increase in homozygosity, which helps in stabilizing the desired traits.

Multiple choice botany plant breeding method of plant breeding for crop improvement plant breeding for food production biotechnology

During somatic hybridisation in plants

  1. Somaclones are produced in large numbers

  2. Apical meristems are cultured to get virus-free plant

  3. Cell walls and middle lamella are digested before fusing the cells

  4. Crop plants with higher levels of vitamins, proteins, and minerals are hybridised.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Somatic hybridization involves the fusion of protoplasts. To achieve this, the cell walls must be removed using enzymes like cellulase and pectinase to allow the plasma membranes to fuse.

Multiple choice botany plant breeding method of plant breeding for crop improvement plant breeding for food production biotechnology

For hybridisation, which part is removed from bisexual flowers

  1. Stigma

  2. Stigma and style

  3. Anthers

  4. Ovary.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Emasculation is the process of removing the anthers from a bisexual flower to prevent self-pollination, ensuring that the flower can only be fertilized by the desired pollen during hybridization.

Multiple choice botany plant breeding method of plant breeding for crop improvement plant breeding for food production biotechnology

Consider the following statements: Hybrid plants can show.
a. Sterility
b. Mosaicism
c. Crossing over
d. Vigour
e. Homozygosis
Which of the statements are correct?

  1. $2, 3$ and $5$
  2. $2, 4$ and $5$
  3. $1, 2$ and $4$
  4. $1, 3$ and $4$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hybrid plants can exhibit sterility due to meiotic irregularities, mosaicism from somatic mutations or chromosomal variation, and hybrid vigor (heterosis). Crossing over is a normal meiotic process occurring in all sexually reproducing plants, not uniquely a hybrid feature, and hybrids are typically heterozygous rather than homozygotic.

Multiple choice botany plant breeding method of plant breeding for crop improvement plant breeding for food production biotechnology

A breeder crossed a pure bred all plant having white flowers to a pure bred short plant having blue flowers. He obtained $202\ F _{1}$ progeny and found that they are all tall having white flowers. Upon selfing there $F _{1}$ plants, he obtained a progeny of $2160$ plants. Approximately, how many of these are likely to be short and having blue flowers?

  1. $1215$
  2. $405$
  3. $540$
  4. $135$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is a dihybrid cross. The F1 generation is heterozygous for both traits (TtWw). In the F2 generation, the probability of a short (tt) blue (ww) plant is 1/4 * 1/4 = 1/16. For 2160 plants, 2160 / 16 = 135.

Multiple choice botany plant breeding method of plant breeding for crop improvement plant breeding for food production biotechnology

Process of bringing wild species of plants under cultivation to suit human needs is called

  1. selection

  2. hybridization

  3. domestication

  4. cultivation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Domestication is the process where wild plant and animal species are adapted into the cultivation area for human use.
The species that are domesticated are used for food, work, medicine and various other uses.
Once the wild species are being domesticated they need to be raised and cared for by humans.
So, the correct option is 'domestication'
Multiple choice botany plant breeding method of plant breeding for crop improvement plant breeding for food production biotechnology

The main objective of plant breeding is to develop new crop varieties superior in all aspects as compared to the existing types.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Plant breeding is a method of altering the genetic pattern of plants to increase their value and utility for human welfare. It is a purposeful manipulation of plants to create desired plant types that are better suited for cultivation, give better yield and are disease resistant. The main aim of plant breeding is to obtain higher yield, improved quality, resistance to pathogens and pests, etc.

So the given statement is true.