Biology

Plant Propagation Techniques

660 Questions

Plant propagation techniques cover both natural and artificial methods of cultivating plants, including micropropagation, tissue culture, and layering. These botanical concepts evaluate how desirable characteristics are multiplied and transferred into new plants. Questions on this topic routinely feature in the biology segment of various state and central competitive exams.

Micropropagation methodsArtificial vegetative propagationPlant tissue cultureLayering techniquesMeristem differentiation

Plant Propagation Techniques Questions

Multiple choice biology economic importance of bacteria and fungi common diseases in humans epidemics transmission of diseases

In mushroom cultivation, spawn is 

  1. Compost

  2. Button stage

  3. Vegetative mycelium

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

Mushroom Spawn is simply any substance that has been inoculated with mycelium, the vegetative growth of the fungus. Mycelium a thread like the collection of the cell is to a mushroom-like an apple tree is to an apple.

So, the correct option is 'Vegetative mycelium'.

Multiple choice zoology insects and human welfare bee keeping apiculture apiculture, sericulture and fisheries

Hypophysation is done in major carps :

  1. To increase size

  2. To increase their growth

  3. To cause breeding in fisheries

  4. To increase their palatability
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hypophysation is the technique of injecting pituitary gland extract into fish to induce spawning and breeding in captivity, which is essential for commercial aquaculture.

Multiple choice evs - i rules are for everyone sustainability of natural resources adaptations - mangrove swamps, fast flowing rivers and treetops halophiles

The method used to conserve vegetatively propagating crops like potato is

  1. Ex situ conservation

  2. In vitro conservation

  3. Cryopreservation

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ex situ conservation is the conservation and maintenance of samples of living organisms outside their natural habitat, in the form of whole plants, seed, pollen, vegetative propagules, tissue or cell cultures.
In vitro techniques have been increasingly used for plants in the last 40-50 years. Conservation of genebank accessions is only one of several uses for the techniques. The basic procedure consists of conserving parts of plants in flasks or tubes in artificial media, under controlled environments, normally in sterile conditions. A prerequisite of successful in vitro conservation is that the plants or plant parts can be regenerated into complete plants for growth and use in any of the ways that genetic resources are used.
Cryopreservation or cryoconservation is a process, where cells, whole tissues, or any other substances susceptible to damage caused by chemical reactivity or time are preserved by cooling to sub-zero temperatures.
All these methods could be used to conserve vegetatively propagating crops.

Multiple choice evs - i rules are for everyone sustainability of natural resources adaptations - mangrove swamps, fast flowing rivers and treetops halophiles

Phytotron is a device by which 

  1. Electrons are bombarded

  2. Protons are liberated

  3. Plants are grown in controlled environment

  4. Mutations are produced in plants
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A phytotron is an enclosed research greenhouse used for studying interactions between plants and the environment. Phytotrons are chambers, that provide controlled environmental conditions for growing plants. Phytotrons have been extensively used for research on how various environmental factors affect plant growth and development.

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

A plant uses .......... means to transfer information from one cell to another as there is no specialized tissue present for the conduction of information. 

  1. Thermal

  2. Electrical

  3. Chemical

  4. Electrochemical
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The most rapid methods of long distance communication between plant tissues and organs are bioelectrochemical signals. The action potential propagates rapidly throughout the plant along electrified interfaces. A potential pathway for transmission of this electrical signal might be the phloem sieve-tube system since it represents a continuum of plasma membranes. A phloem is an electrical conductor of bioelectrochemical impulses over long distances. At the cellular level in plants, electrical potentials exist across membranes, and thus between cellular compartments, as well as within specific compartments. Electrochemical phenomena are primary, and then deep cytophysiological reactions occur.

So, the correct answer is 'Electrochemical'.
Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

The growth of the shoot in the direction of source of light is an example of growth independent movement.

  1. True

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

The growth of shoot is the directional movement of the plant that occurs in the direction of stimulus (light) and plant move towards the light and grows in that direction.

So the given statement is 'False'.

Multiple choice botany biotechnology and its applications biotechnology in agriculture gm crops transgenic organisms

Transgenic plants are the ones

  1. Grown on artificial medium after hybridisation in the field

  2. Produced after protoplast fusion in artificial medium

  3. Produced by somatic embryo on artificial medium

  4. Generated by introducing foreign DNA into a cell and regenerating plant from that cell
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Transgenic plants are defined by the stable integration of foreign DNA (transgenes) into their genome, which is then expressed in the plant cells.

Multiple choice botany biotechnology and its applications biotechnology in agriculture gm crops transgenic organisms

Tobacco plants resistant to nematodes have been developed by introduction of DNA that produces _____________.

  1. Both sense and anti sense RNA

  2. An antifeedent

  3. A toxic protein

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

RNA interference (RNAi) is used to protect tobacco plants from nematodes. By introducing DNA that produces both sense and antisense RNA, the plant creates double-stranded RNA, which silences essential nematode genes.

Multiple choice botany biotechnology and its applications biotechnology in agriculture gm crops transgenic organisms

Transgenic plants are the ones -

  1. Grown in artificial medium after hybridization in the field

  2. Produced by a somatic embryo in artificial medium

  3. Generated by introducing foreign DNA in to a cell and regenerating a plant from that cell

  4. Produced after protoplast fusion in artificial medium
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Transgenic plants are defined as plants that have had their genetic makeup modified by the introduction of foreign DNA from another species, followed by the regeneration of a whole plant from the modified cell.

Multiple choice botany biotechnology and its applications biotechnology in agriculture gm crops transgenic organisms

RNA interference which is employed in making tobacco plant resistant to Meloidegyne incognita is essentially involved in

  1. preventing the process of replication of DNA

  2. preventing the process of translation of mRNA

  3. preventing the process of splicing of hnRNA

  4. preventing the process of transcription
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

RNA interference is a gene-silencing process that blocks the expression of genes in the parasite when it enters the host's body.RNA is a method adopted to prevent infestation of roots of tobacco plants by a nematode Meloidogyne incognita. In RNA, a complementary RNA binds to mRNA to form a ds RNA that cannot translate and hence, its expression is blocked.

So, the correct option is 'Preventing the process of translation of mRNA'.

Multiple choice botany pollination, fertilization and development of endosperm and embryo agents of pollination environmental conservation and biodiversity pollination and fertilization

By tissue culture, indefinite number of plants from a small amount of parental tissue can be obtained. This technique is of great economic importance as ____________________________.

  1. New species can be generated

  2. Through somaclonal variation, a large number of variants can be isolated

  3. It is a useful method to multiply genetically uniform population of elite species

  4. Homozygous diploids can be obtained
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tissue culture technology is grounded on the fact that the entire plant can be regenerated from explants. This capacity to produce a whole plant from any cell/explant is named totipotency. Individually these plants will be genetically identical to the original plant. Several important food plants like tomato, apple, banana, etc., can be generated on the commercial scale by this method.

Thus, the correct option is C.

Multiple choice botany pollination, fertilization and development of endosperm and embryo agents of pollination environmental conservation and biodiversity pollination and fertilization

Animals assist with

  1. Pollination and seed dispersal

  2. Control of plant growth and response

  3. Translocation of organic nutrients

  4. Asexual propagation of plants
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pollination is when pollen grains from an anther, the male portion of a flower, are transferred to a female part in the flower, known as the stigma. Zoophily is a form of pollination whereby pollen is transferred by animals. Zoophilous species frequently evolve mechanisms to make themselves more appealing to the particular type of pollinator. Seed dispersal is the movement or transport of seeds away from the parent plant. Plant species transported externally by animals can have a variety of adaptations for dispersal, including adhesive mucus, and a variety of hooks, spines and barbs

So, the correct answer is 'pollination and seed dispersal'

Multiple choice botany reproduction in angiospermic plants artificial vegetative propagation asexual modes of reproduction common modes of vegetative propagation

Artificial vegetative propagation is a .......... method.

  1. Slow

  2. Natural

  3. Man-made

  4. Both A and C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Artificial propagation is the creation of new life by other than the natural means available to an organism. Cutting plants' stems and placing them in compost is also a form of artificial reproduction. We can grow many plants from one plant by using the man-made methods. The process of growing many plants from one plant by man-made methods is called as the artificial propagation of plants.

Multiple choice botany reproduction in angiospermic plants artificial vegetative propagation asexual modes of reproduction common modes of vegetative propagation

Mango and guava are propagated through

  1. Tissue culture.

  2. Grafting.

  3. Stem cuttings.

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

Mango and guava are propagated through grafting. It is a horticulture technique where the living detached portion of the plant is used to regenerate the growth. One plant is selected for its roots and this is called the stock or rootstock. The other plant is selected for its stems, leaves, flowers, or fruits and is called the scion. The joining of scion and stalk is known as inosculation. The techniques are mostly used in the asexual mode of reproduction. 

So, the correct answer is option B.

Multiple choice reproduction in angiospermic plants artificial vegetative propagation asexual modes of reproduction common modes of vegetative propagation

Clones do not appear during.

  1. Cuttings

  2. Budding

  3. Grafting

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

Clones are the result of asexual reproduction. Seed propagation involves sexual reproduction (fertilization), which introduces genetic recombination and variation, meaning the offspring are not clones.