Which of the following are homosporous pteridophytes?

I. Selaginella

II. Lycopodium

III. Salvinia

IV. Equisetum

• I and IV only

• II and III only

• II and IV only

• III and IV only

Identify the given structure

• Adenylic acid

• Uracil

• Cholesterol

• Adenosine

Cornea transplant in humans is almost never rejected. This is because

• it is composed of enucleated cells

• it is a non-living layer

• its cells are least penetrable by bacteria

• it has no blood supply

4.

Pseudostratified epithelium is found in

• seminiferous tubule

• Fallopian tube

• trachea

• kidney tubules

The given figure shows schematic plan of blood circulation in humans with labels A to D. Identify the labels along with their functions and select the correct option.

• C- Vena Cava - takes blood from body parts to right atrium, Pco₂ = 45 mm Hg

• D- Dorsal aorta - takes blood from heart to body parts, Po₂ = 95 mm Hg

• A- Pulmonary vein - takes impure blood from body parts to heart, Po₂ = 60 mm Hg

• B- Pulmonary artery - takes blood from heart to lungs, Po₂= 90 mm Hg.

Which one of the following is not a mammalian character?

• Presence of milk producing glands

• Skin is unique in possessing hair

• Presence of external ears called pinnae

• Homodont type of dentition

Retrogressive metamorphosis occurs in

• Hemichordata

• Cephalochordata

• Urochordata

• Vertebrata

One hormone hastens maturity period in juvenile conifers, a second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stresses. They are respectively

• Gibberellin, Auxin, Ethylene

• Auxin, Gibberellin, Cytokinin

• Gibberellin, Auxin, ABA

• Auxin, Gibberellin, ABA

The H-zone in the skeletal muscle fibre is due to

• the central gap between actin filaments extending through myosin filaments in the A-band

• extension of myosin filaments in the central portion ofthe A-band

• the absence of myofibrils in the central portion of A-band

• the central gap between myosin filaments in the A-band.

The volume of 'anatomical dead space' air is normally

• 230 mL

• 210 mL

• 190 mL

• 150 mL