21.

In humans, schizont stage of Plasmodium is found inside:

• liver cells only

• liver, spleen and blood cells

• RBCs and liver cells

• RBCs only

In honey bee, royal jelly is secreted from :

• corp gland

• wax gland

• pharyngeal gland

• salivary gland

Which of the following is correct pair of disease and its causing agent ?

• Soft - sour - Bacillus breveis

• Gonorrhoea - Entamoeba

• Syphilis - Troponema pallidum

• Urethritis - Bacillus anthracis

Lac is obtained from :

• Laccifer

• Bombyx

• Dactylopius

• Lytta

As insecticides reach at higher trophic level in food chain their concentration :

• increases

• become irregular

• remain constant

• decreases

Kala-azar disease is transmitted by :

• Tabinus

• Sotomax

• Glossina

• Phlebotomus

Which of the following cells are associated with immune system of body?

• Neutrophils

• Macrophages

• Lymphocytes

• All of these

To obtain amino-acids and other organic compounds, Stanley Miller and Urey used in his experiment :

• mixture of O₂, N₂, CH₄ and H₂O

• mixture of NH₃, H₂, N₂ and H₂O

• mixture of H₂, NH₃, CH₄, and H₂O

• mixture of H₂, O₂, CO₂ and H₂O

Interbreeding population of animals is called :

• sub-species

• species

• community

• genus

Which of the following is a living fossil ?

• Latimeria

• Amia

• Hippocampus

• Exocoetus