31.

Which one of the following pairs of animal comprises' jawless fishes'

• Lampreys and eels

• Mackerels and rohu

• Lampreys and hag fishes

• Lampreys and hag fishes

The cell junctions called tight, adhering and gap junctions are found in 

• muscular tissue

• connective tissue

• epithelial tissue

• epithelial tissue

Vegetative propagation in mint occurs by 

• runner 

• offset

• rhizome

• rhizome

What will happen if the stretch receptors of the urinary bladder wall are totally removed?

• Urine will not collect in the bladder

• Micturition will continue

• Urine will continue to collect normally in the bladder

• Urine will continue to collect normally in the bladder

One of the synthetic auxins is

• NAA

• IAA

• GA

• GA

The kind of tissue that forms the supportive structure in our pinna (external ears) is also found in 

• vertebrae

• nails

• ear ossicles

• ear ossicles

Which one of the following is a vascular cryptogam?

• Equisetum 

• Ginkgo

• Marchantia

• Marchantia

Which one of the following acids is a derivative of carotenoids?

• Indole butyric acid

• Indole -3-acetic acid

• Gibberellic acid

• Gibberellic acid

Guard cell help in

• protection against grazing

• transpiration

• guttation

• guttation

Palisade parenchyma is absent in leaves of 

• sorghum

• mustard

• soybean

• soybean