The crystal of lead zirconate is a key component of

• sonography

• electrocardiography

• electroencephalography

• magnetoencephalography

Assertion : Leaf butterfly and stick insect show mimicry to dodge their enemies.

Reason : Mimicry is a method to acquire body colour blending with the surroundings.

• If both Assertion and Reason are true and the reason is the correct explanation of the assertion

• If both Assertion and Reason are true but the reason is not the correct explanation of the assertion

• If Assertion is true statement but Reason is false

• If both Assertion and Reason are false statements

Lucocytes (WBCs) are considered as true cells because

• they possess nucleus

• they do not contain haemoglobin

• they show great power of movement

• they are responsible forphagocytic activity

The function of microvilli is :

• cellular movement

• specialized uptake of macro molecules

• increase in surface area for absorption

• extensive movement of substances over cell surface

Adipocytes are mainly found in

• bones

• cartilages

• connective tissue

• nerves

The outer covering of cartilage is called

• peritonium

• periosteum

• endosteum

• perichondrium

Skin is an accessory organ of respiration in

• human

• frog

• rabbit

• lizard

Inner surface of the bronchi, bronchioles and fallopian tubes are lined by

• cubical epithelium

• columnar epithelium

• squamous epithelium

• ciliated epithelium

What external changes are visible after the last moult of a cockroach nymph?

• Mandibles become harder

• Anal cerci develop

• Both fore wings and hind wings develop

• Labium develops

Which of the following tissues provide maximum mechanical support to plant organs?

• Sclerenchyma

• Collenchyma

• Parenchyma

• Aerenchyma