Monthly Archives: September 2021

1. Which is the major source of harmful radiations in the house ? (A) Tube light (B) Colour TV (C) Oven (D) Heater Answer-( A )   2. Which one…

1. Decrease in species diversity in tropical countries is mainly due to : ( A ) urbanisation ( B ) pollution ( C ) deforestation ( D ) soil erosion…

1. Controlling factor in ecosystem is : (A) Soil moisture (B) Food (C) Predation (D) Temperature Answer-( C )   2. Bacteria and Fungi are : (A) Scavengers (B) Primary…

1. The mycorrhiza is an example of ( A ) Symbiotic interaction ( B ) Ectoparasite ( C ) Endoparasite ( D )Decomposer Answer-( A )   2. Lichen is…

1. Which of the following enzyme is used to break the bacterial cell wall to release DNA and other bio macro molecules? ( A ) Lysozyme ( B ) Cellulase…

1. A molecular technique in which multiple copy of the desired gene is synthesized in vitro is called as (A) ELISA (B) PCR (C) Gel Electrophoresis (D) Flow cytometry Answer-(…

1. Aquatic fern which is an excellent biofertilizer : ( A ) Salvinia ( B ) Azolla ( C ) Marsellia ( D ) Pteridium Answer-( B )   2.…

1. Which in the following is an improved variety of chicken ? ( A )Jersey ( B ) Leghorn ( C ) Himgiri ( D ) Kalyansona Answer-( B )…

1.HIV attacks : ( A ) B-lymphocytes ( B ) Antibodies ( C ) T-lymphocytes ( D ) Erythrocytes Answer-( C )   2. Aquatic fern which is an excellent…

1. Major radiation of mammals, birds and pollinating insects took place in which epoch? ( A ) Oegocene ( B ) Eocene ( C ) Pliocene ( D ) Palaeocene…