Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

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

The term scion is used in 

  1. Embryology

  2. Grafting

  3. Agamospermy

  4. Emasculation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Embryology is the science of development of the embryo. It is a branch of science which deals with the development of gametes, fertilization, and development of embryos.
Scion is the detached living part of the plant which is grafted to the stalk by the process of grafting. Grafting 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. 
Agamospermy is an asexual reproduction in which seeds are produced from unfertilized ovules.
The removal of the anthers of a flower in order to prevent self-pollination is known as emasculation.
So, the correct answer is option B.
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 botany taxonomy and systematic botany plant taxonomy taxonomy and systematics classification of biodiversity

The accumulation of non-biodegradable substances in a food chain in increasing amount at each higher trophic level is known as _____________.

  1. Accumulation

  2. Eutrophication

  3. Pollution

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

The increase in concentration of non-biodegradable substance with subsequent trophic level of a food chain is called bio-magnification.

Multiple choice botany plant taxonomy taxonomy and systematics taxonomy and systematic botany classification of biodiversity

Bentham and Hooker's system of classification is published in the book

  1. Genera Plantarum

  2. Species Plantarum

  3. Phylum Plantarum

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bentham and Hooker's system of classification is published in the book Genera Plantarum. It was published in 3 volumes from the year 1862 to 1883. It is a natural system of classification. In this book, they arranged the species according to the system. They grouped 97,205 species of flowering plants into 202 orders.

Thus, the correct answer is 'Genera Plantarum.'

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

Which of the following scientist coined term lichen? 

  1. Aristotle

  2. Theophrastus

  3. Socrates

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

Lichen is a symbiotic association of fungi ( Ascomycota or basidiomycete) with an alga (Chlorophyceae or Cyanophyceae). The term Lichen was coined by Theophrastus (370-285 BC).

So, the correct  option is 'Theophrastus'.

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

Thallus is foliose in 

  1. Lichens

  2. Algae

  3. Mosses

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

Lichens are a symbiotic partnership of fungus and algae. The dominant partner is the fungus, which gives the lichen the majority of its characteristics from its thallus shape to its fruiting bodies. So, thallus is foliose in lichens. Lichens occur in one of four basic growth forms. crustose, squamulose, foliose and fruticose. So, the correct answer is 'Lichens'.

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

Which of the following physiological process happens in lichens when the phycobiont is a cyanobacteria?

  1. Nitrogen fixation

  2. Carbon fixation

  3. Carbon assimilation

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

The fungal part of the lichens is known as mycobiont. Cyanobacteria have a special structure known as heterocyst which is specialised to perform nitrogen fixation. It has specific enzymes like nitrogenase which actively fixes the atmospheric nitrogen to a usable form. They are autotrophic so they also fix carbon during the dark reaction of photosynthesis into organic compounds. This conversion process of inorganic carbon (carbon dioxide) to organic compounds is also known as carbon assimilation.

So, the correct answer is 'Nitrogen fixation, Carbon fixation and Carbon assimilation'.

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

The nutrients received by heterotrophic part of the lichen from the autotrophic part are

  1. Lipids

  2. Proteins

  3. Carbohydrates

  4. Minerals
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The algal component carries out photosynthesis and produces carbohydrate glucose during the dark reaction of photosynthesis.
  • Minerals are provided to the algal part by fungal mycelium. It absorbs water and minerals from the substratum.
  • Lipids and proteins are neither supplied by algal part nor fungal part but synthesized within the organism itself.
  • So the correct answer is 'Carbohydrate'.
Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Lichens are not found in _________?

  1. Water

  2. Tree trunks

  3. Decaying logs

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

Lichens are found in odd places which includes areas in the Arctic and Antarctic, and mountain tops. Lichens are found on soil, rock or tree bark. Some will also grow on old wood (dead branches, fence rails, etc.), masonry and cemetery headstones. Lichens are often found in extreme environments where other organisms are sparse.


So the correct option is 'Water'.