Which of the following factor is biotic

• Photoperiod

• CO₂ content to the soil

• Texture and porosity of soil

• Rainfall

When the pollen tube enters through the micropyle, it is termed as

• chalazogamy

• mesogamy

• porogamy

• none of these

For self pollination, flower must be

• unisexual

• bisexual

• monosexual

• asexual

Which of the following cytoplasmic granules contain histamine

• Basophils

• Acidophils

• Eosinophils

• Neutrophils

Refractory period of a muscle fibre in mammals is

• 0.8001 sec

• 0.002 sec

• 0.004 sec

• 0.005 sec

Dispersal of fruits in Opium (poppy) occur through shaking by wind by

• explosive mechanism

• parachute mechanism

• censer mechanism

• jacular mechanism

Squeezing of leucocytes out from the endothelium of capillaries to fight foreign agents. is known as

• haemolysis

• diapaedesis

• phagocytosis

• rouleaux

Which organ is considered as "Graveyard of RBC" where most of them are destroyed by macrophages

• Red bone marrow

• Spleen

• Kidney

• Intestine

When one organism is benefited without affecting the other, it is called

• parasitism

• commensalism

• saprophytis

• symbiosis

A branch of science in which. forest crop can be grown in desired pattern is

• Histology

• Horticulture

• Pisiculture

• siliviculture