Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology sustainable agriculture patterns of cropping rotation of crops cropping patterns common irrigation systems

The growing two or more crops at a time in a field is called as

  1. Crop rotation

  2. Inter cropping

  3. Mixed cropping

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

When the same land is used for the cultivation of more than one crop is known as mixed cropping. The same field is divided into smaller regions. The seeds of different crops are sown and cultivation of different crops is carried out in the same piece of land. 

Thus, the correct answer is option C. 

Multiple choice biology sustainable agriculture patterns of cropping rotation of crops cropping patterns common irrigation systems

Which of the following biofertilizer bacteria is a phosphorus solubilizer?

  1. Azotobacter

  2. Azospyrillum

  3. Basillus & Pseudomonas

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

A.Azotobacter is a genus of usually motile, oval or spherical bacteria . It has several metabolic capabilities, including atmospheric nitrogen fixation by conversion to ammonia.
B.Azospirillum bacteria can promote plant growth. 
C.The bacteria Basillus  & Pseudomonas convert non labile Phosphorous  through either inorganic Phosphorous solubilizing or organic Phosphorous mineralization processes.
D.Cyanobacteria, also known as Cyanophyta, are a phylum of bacteria that obtain their energy through photosynthesis, and are the only photosynthetic prokaryotes able to produce oxygen.
So the correct option is ' Bacillus  & Pseudomonas ' .

Multiple choice biology sustainable agriculture patterns of cropping rotation of crops cropping patterns common irrigation systems

The technique of growing two or more different crops together in the same field is known as 

  1. mixed cropping

  2. mixed farming

  3. inter-cropping

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

Mixed cropping is a technique which involves growing up of two or more different crops in the same field. The different crops to be grown together are so chosen that they do not have common pests and pathogens or similar requirement of water and animals. For example, ground nut and sunflower/gram.

Multiple choice biology sustainable agriculture patterns of cropping rotation of crops cropping patterns common irrigation systems

________ is grown in mixed cropping.

  1. Maize + Black gram

  2. Sunflower + Soyabean

  3. Sorghum + wheat

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

Mixed cropping is a system of planting two or more crops at a time on the same land. It is also known as poly-culture i.e two types of crops are sown and irrigated at a time.  Mustard and wheat is an example of mixed cropping.

So, the correct option is ' Maize+Black gram'.

Multiple choice biology sustainable agriculture patterns of cropping rotation of crops cropping patterns common irrigation systems

The selection of crops in mixed cropping is in such a way that they support each others growth.

  1. True

  2. False

  3. Ambiguous

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

The method of growing two or more crops simultaneously on same piece of land is called mixed cropping or inter-cropping. This method helps in improving the fertility of soil. It is very important that crops support each others growth to grow all of them on same piece of land.

Multiple choice biology biotechnology and genetic engineering use of microbes in biotechnology use of microbes in industrial applications useful microorganisms

Which of the following is correct about mushroom?

  1. Moss

  2. Fern

  3. Yeast

  4. Pine

  5. Seaweed

  6. Fungi
Reveal answer Fill a bubble to check yourself
F Correct answer
Explanation

Fungi are a separate class of microorganisms that reproduce by spores and are thus different from plants that require photosynthesis to make food for themselves. Fungi consist of molds, yeast, mildew, and mushrooms. It can be unicellular or multicellular. So all mushrooms are fungi, though not all fungi are mushrooms as there are much more types of fungi than mushrooms. Mushroom is not yeast.

Multiple choice biology biotechnology and genetic engineering use of microbes in biotechnology use of microbes in industrial applications useful microorganisms

The new strain of bacteria produced by biotechnology in alcohol industry is.

  1. Escheriachia coil

  2. Sacharomyces cerevisiae

  3. Bacillus subtills

  4. Pseudomonas putida
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pseudomonas putida is a bacterium that has been developed through biotechnology for applications in the alcohol industry. It can be used for various biotransformations and has applications in industrial fermentation processes. The other options are incorrect: E. coli (typo in option), S. cerevisiae is yeast not bacteria, and B. subtilis is not specifically associated with alcohol industry biotechnology.

Multiple choice biology biotechnology and genetic engineering use of microbes in biotechnology use of microbes in industrial applications useful microorganisms

Progenitors formed in bone marrow but differentiating elsewhere are

  1. Pre-NK cells

  2. Pre-erythroblasts

  3. Pre-T cells

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

Pre T cells are progenitors of T- lymphocytes which are produced from the bone marrow. Pre- T cells undergo differentiation and maturation in the thymus to form matured T- cells. T-cells can be distinguished from other lymphocytes by the presence of a T-cell receptor on the cell surface.  Hence, Progenitors formed in bone marrow but differentiating elsewhere are Pre-T cells.

So, the correct answer is 'Pre-T cells'.

Multiple choice biology why classification? modern classification system traditional method of animal classification salient features of five kingdoms classification hierarchy hierarchy of classification

Multicellular eukaryotic organism with holophytic mode of nutrition belong to how many kingdoms in Whittaker system?

  1. One

  2. Two

  3. Three

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

In Whittaker's five kingdom system of classification, only kingdom Plantae have organisms with a multicellular eukaryotic organism with holophytic nutrition. The organisms which are able to synthesize food by photosynthesis are said to have holophytic nutrition. 


So, the correct option is ' one'.