Biology – Class 12 Practice Test 8

1. Which letter is used to designate the emigration?

2. Antibodies are secreted against the _____

antibodies

animals

antigen

cells

3. Which agriculturally important bacterial gene is isolated from Rhizobium?

F-gene

Nif gene

E-gene

T-DNA

4. Which letter is used to designate the birth rate (Natality)?

5. What are most of the invertebrates?

Thermoregulators

Thermoconformers

Osmoregulators

Conformers

6. In which plants do sunken stomata is seen?

Temperate plants

Hydrophytes

Xerophytes

Tropical plants

7. A desirable change in the genotype of an organism is obtained by _______

m-RNA formation

DNA replication

rDNA technology

protein synthesis

8. Basmati rice is distinct for its unique _______ and flavor.

aroma

shape

taste

vitamins

9. Which one among the following statements is incorrect?

Fishes can thrive in Antarctic water where the temperature is always below zero

Archaebacteria flourishes in hot springs where the temperature exceeds >95°C

Siberian crane is a migratory bird

Desert lizard has the ability to keep the constant body temperature

10. From which animals were insulin obtained in the early days?

Insects

Cattle and pigs

Lizard and snakes

Cats and dogs