Tag: biology

Questions Related to biology

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

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

  1. Crop rotation

  2. Inter cropping

  3. Mixed cropping

  4. None of the above

Show answer
Correct Option: C
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. 

Which of the following biofertilizer bacteria is a phosphorus solubilizer?

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

  1. Azotobacter

  2. Azospyrillum

  3. Basillus   & Pseudomonas

  4. Cyanobacteria

Show answer
Correct Option: C
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 ' .

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

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

  1. mixed cropping

  2. mixed farming

  3. inter-cropping

  4. crop rotation.

Show answer
Correct Option: A
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.

________ is grown in mixed cropping.

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

  1. Maize + Black gram

  2. Sunflower + Soyabean

  3. Sorghum + wheat

  4. All of the above

Show answer
Correct Option: A
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'.

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

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

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient

Show answer
Correct Option: A
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.

Which of the following is correct about mushroom?

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

  1. Moss

  2. Fern

  3. Yeast

  4. Pine

  5. Seaweed

  6. Fungi

Show answer
Correct Option: F
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.

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

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

  1. Escheriachia coil

  2. Sacharomyces cerevisiae

  3. Bacillus subtills

  4. Pseudomonas putida

Show answer
Correct Option: D

Progenitors formed in bone marrow but differentiating elsewhere are

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

  1. Pre-NK cells

  2. Pre-erythroblasts

  3. Pre-T cells

  4. Myeloblasts

Show answer
Correct Option: C
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'.

Yeast is not an important source of

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

  1. vitamin C

  2. vitamin B

  3. vitamin A

  4. vitamin D

Show answer
Correct Option: A,B,D

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

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

  1. One

  2. Two

  3. Three

  4. Five

Show answer
Correct Option: A
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'.