Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Select the true statements out of the following.

  1. The lichens are curious because they are composite or dual organism.

  2. The apothecium consists of the fungal component only (e.g. Cladonia), such apothecia are called lecideine type.

  3. Parmelia, Physica, Lecanora etc. have more highly developed apothecia called Lecanorine type in which both fungal and algal components are present.

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

Lichens are a small group of curious plants, they are curious because they are the composite or dual organism. They are the association between fungi and green algae or blue-green bacteria.

Apothecium is round and cup-shaped structure. If the apothecium consists only the fungal component, it is known as lecideine type (e.g., Lecidea, Cladonia, Gyrophora) and if it consists bath algal and fungal components it is known as lecanorine type (e.g., Lecanora, Parmelia).
Therefore, the correct answer is option D.

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

In lichens, medulla has

  1. Endodermis

  2. Hadrome

  3. Hypodermis

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

Mosses are flowerless plants that grows as dense green tufts or mats in damp and shady locations. Lichens on the other hand though, they appear similar to mosses, are not related to these are are a composite organism of algae, cyanobacteria and living in a symbiotic relationship in a fungus. The medulla which is found below the cortex in lichens and is made up of loosely woven layer of fungal filaments. Hadrome refers  to collection of hydroids or vascular tissue that occur in some bryophytes or mosses and help in transporting water and minerals drawn from the soil.

Therefore, the correct answer is option B.

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

During unfavourable conditions slime molds form spores which are survival for a long time, spore dispersal take place by

  1. Water currents

  2. Air currents

  3. Insects

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Slime moulds are Saprophytic Protists.
  • They move along decaying twigs and leaves engulfing organic material. 
  • Under a suitable condition, they form aggregation called Plasmodium.
  • During unfavourable condition, the plasmodium differentiates and form fruiting bodies bearing spores at their tips.
  • The spores possess true walls.
  • They are extremely resistant and survive for many years even under adverse conditions. 
  • The spores are dispersed by air currents.
  • So, the correct answer is 'Air currents'.
Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

A teacher explaining physical contact leading to equal physiological dependence between two thalloid forms was telling about

  1. Mycorrhizal association

  2. Establishment of heterothallism

  3. Operation of heterothallism

  4. Advent of lichen formation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lichens are formed by the physical association between fungal partner and the algal partner. The fungal partner acts as a mycobiont and algal partner acts as a phycobiont. In lichens, fungus grow around algae and provide bulk for their growth. The algae and fungus association is must for lichens to reproduce. So, they are physically dependent on each other. Here, both fungus and algae are in their thalloid forms.

So, option D is the correct answer.

Multiple choice botany biotechnology and genetic engineering stds and infertility gm crops biotechnology

The genetically-modified (GM) brinjal in India has been developed for

  1. Drought resistance

  2. Insect resistance

  3. Enhancing shelf life

  4. Enhancing mineral content
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Bt brinjal is a suite of transgenic brinjals created by inserting a crystal protein gene (Cry1Ac) from the soil bacterium Bacillus thuringiensis into the genome of various brinjal cultivars. The insertion of the gene, along with other genetic elements, such as promoters, terminators and an antibiotic resistance marker gene into the brinjal plant is accomplished using Agrobacterium-mediated genetic transformation. 

The Bt brinjal has been developed to give resistance against lepidopteron insects, in particular the brinjal fruit. 

Multiple choice botany biotechnology and genetic engineering stds and infertility gm crops biotechnology

What is the genomic constitution of old world varieties of cotton (Gossypium arboreum, G. herbaceum) and new world varieties (G. hirsutum, G. barbedens) ______________.

  1. All diploids

  2. All triploids

  3. Old world 3n and new world 2n

  4. Old world 2n and new world 4n
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

(d) Gossypium arboreum, G. herbaceous - old world
species - 2n = 26 Diploid Gossypium hirsutum, G.
barbedens- new world species - 2n = 52 tetraploid.

Multiple choice botany biotechnology and genetic engineering stds and infertility gm crops biotechnology

Man-made cereal is

  1. Triticum

  2. Hordeum

  3. Triticale

  4. Eleusine
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
1) Triticum: Wheat is a grass widely cultivated for its seed, a cereal grain which is a worldwide staple food. The many species of wheat together make up the genus Triticum; the most widely grown is common wheat.
2) Hordeum is a genus of annual and perennial plants in the grass family
3) Triticale is a crop species resulting from a plant breeder's cross between wheat (Triticum) and rye (Secale). The name triticale (Triticale hexaploide Lart.) combines the scientific names of the two genera involved.
4) Eleusine is a genus of Asian, African, and South American plants in the grass family, sometimes called by the common name goosegrass.

So, the correct answer is 'Triticale'.