31.

Mitochondria contains

• only DNA

• DNA and RNA

• only RNA

• None of the above

Which of the following shows minimum number of chromosomes?

• n : 1

• n : 2

• n : 3

• n : 4

Which of the following is formed in light reaction of photosynthesis?

• ATP

• NADPH₂

• O₂

• All of the above

Who proposed 'fluid mosaic model' of plasma membrane?

• Singer and Nicholson

• Robertson

• Benneson

• None of the above

Respiratory roots (pneumatophores) are present in

• mesophytes

• halophytes

• xerophytes

• None of these

The cell wall of fungi is formed by

• chitin and mannose

• cellulose

• glucose

• None of the above

Which is present in vascular bundle ofPinus?

• Tracheids

• Vessels

• Companion cells

• All of the above

Growth of stem in diameter is due to

• apical cell

• lateral meristem

• apical meristem

• intercalary meristem

The plant group in which stomata opens in night is

• mesophytes

• succulents

• hydrophytes

• None of the above

The 'respiratory quotient' of fat is

• 0.7

• 1.5

• 1 

• 2