The figure shows a diagrammatic view of the human respiratory system with label A, B, C and D. Select the option. Which gives correct identification and main function and /or characteristic.

• A - trachea - long tube supported by complete cartilaginous rings for conducting inspired air.

• B - pleural membrane - surround ribs on both sides to provide cushion against rubbing

• C - alveoli - thin walled vascular bag - like structure for exchange of gases

• C - alveoli - thin walled vascular bag - like structure for exchange of gases

42.

Figure shows schematic plan of blood circulation in human with labels  A to D. Identify to label and give its function/s

• A - pulmonary vein - takes impure blood from body parts,pO₂ = 60 mmHg

• B - pulmonary artery - takes blood from heart to lungs, pO₂ = 90 mmHg

• C - vena cava - takes blood from body parts to right auricle, pCO₂ = 45 mmHg

• C - vena cava - takes blood from body parts to right auricle, pCO₂ = 45 mmHg

The diagram given here is the standard ECG of a normal person. The P- wave represents the

• Contraction of both the atria

• initiation of the ventricular contraction

• the beginning of the systole

• the beginning of the systole

The figure shows a human urinary system with structure labelled A to D. Select option, which correctly identifies them and gives their characteristics and of function.

• A - adrenal gland - located at the anterior part of kidney. Secrete catecholamines, which stimulate glycogen breakdown

• B- pelvis -board funnel-shaped space inner to hilum, directly connected to loops of Henle

• C - mediulla-inner zone of kidney and contains complete nephrons.

• C - mediulla-inner zone of kidney and contains complete nephrons.

A diagram showing axon terminal and synapse is given. Identify correctly at least two of A-D.

• A – Receptor

  C – Synaptic vesicles

• B – Synaptic connection

  D- K+

• A – Neurotransmitter

  B- Synaptic  cleft

• A – Neurotransmitter

  B- Synaptic  cleft

Parts A, B, C and D of the human eyes are shown in the diagram. Select the option, which gives correct identification along with its functions/ characteristics

• A - retina - contains photoreceptors -rods and cones

• B-blind spot- has only a few rods and cones

• C - aqueous chamber - reflects the light which does not pass through the lens

• C - aqueous chamber - reflects the light which does not pass through the lens

Megasporangium is equivalent to

• embryo sac

• fruit

• nucellus

• nucellus

Read the following statements (IV) and answer the question which follows them
I. In liverworts, mosses and ferns gametophytes are free living.
II) Gymnosperms and some ferns are heterospores.
III) Sexual reproduction in Fucus, Volvox and Albugo is oogamous.
IV) The sporophyte in liverworts is more elaborate than that in mosses.

How many of the above statements  are correct?

• One

• Two

• Three

• Three

Age of tree can be estimated by

• Its height of girth

• biomass

• number of annual rings

• number of annual rings

Which one of the following statement is correct?

• Hard outer layer of pollen is called intine

• Sporogenous tissue is haploid

• Endothecium produces the microspores

• Endothecium produces the microspores