The name of the pace maker of the heart is

• lymph node

• SA node

• juxtaglomerular apparatus

• semilunar valve

Acid rain is caused by

• NO₂

• SO₂ and NO₂

• SO₃

• CO₂

Pieces of plant tissue used in culture is called

• explant

• domaclone

• inoculant

• clone

Structural element of chromatin is

• histone

• acid protein and DNA

• nuclear matrix

• nucleosomes

Biolistic technique is used in

• tissue culture process

• gene transfer process

• hybridization process

• germplasm conservation process

Fertilization occur in

• uterus

• ureter

• vagina

• fallopian tube

Which of the following is related to humoral immunity?

• T- lymphocyte

• B- lymphocyte

• I- lymphocyte

• P- lymphocyte

The scientific name of the moth which produce tasar is

• Bombyx mori

• Antherae mylitta

• Antherae assamensi

• Philosomia ricini

Ovule integument gets transformed into

• seed

• fruit wall

• seed coat

• cotyledons

Polyploid derived from two different species is called

• autopolyploid

• triploid

• allopolyploid

• monoploid