Read the following statements regarding methanogens and select the correct option.
(i) They are included in the group Archaebacteria.
(ii) They are responsible for the production of biogas in gobar gas plants.
(iii) They live in hot sulphur springs.
(iv) They are strictly anaerobic.

Read the following statements regarding spleen and select the correct option. (i) Spleen is a large oval-shaped organ which mainly contains lymphocytes and phagocytes. (ii) Spleen is a large reservoir of erythrocytes. (iii) Spleen is a primary lymphoid organ. (iv) spleen acts as a filter of the blood by trapping blood-borne microorganisms.

Read the following statements regarding spleen and select the correct option. (i) Spleen is a large oval-shaped organ which mainly contains lymphocytes and phagocytes. (ii) Spleen is a large reservoir of erythrocytes. (iii) Spleen is a primary lymphoid organ. (iv) spleen acts as a filter of the blood by trapping blood-borne microorganisms.

Read the following statements regarding spleen and select the correct option. (i) Spleen is a large oval-shaped organ which mainly contains lymphocytes and phagocytes. (ii) Spleen is a large reservoir of erythrocytes. (iii) Spleen is a primary lymphoid organ. (iv) spleen acts as a filter of the blood by trapping blood-borne microorganisms.

Read the following statements regarding spleen and select the correct option. (i) Spleen is a large oval-shaped organ which mainly contains lymphocytes and phagocytes. (ii) Spleen is a large reservoir of erythrocytes. (iii) Spleen is a large reservoir of erythrocytes. (iv) spleen acts as a filter of the blood by trapping blood-borne microorganisms.

Read the following and select the correct option : A. Carnivora is a/an (i) that involves (ii) and Canidae. B. Petunia and (iii). belongs to Family (iv)

Read the following and select the correct option : A. Carnivora is a/an (i) that involves (ii) and Canidae. B. Petunia and (iii). belongs to Family (iv)

Read the following statements regarding cockroach and select the correct option. I-2nd nymphal stage of cockroach is almost similar to adult except that the wings, II- Development of nymph takes place inside ootheca.

Read the statements regarding a stable community and choose the correct option : (i) Must be resistant to occasional disturbances. (ii) Should show much variation in productivity from year to year. (iii) Must be resistant to invasions by alien species.