Biology : Structural Organisation In Animals

In cockroach, the arthrodial membrane

• forms the hind wings

• covers the compound eyes

• forms the hypopharynx

• forms the tegmina

• forms the tegmina

Choose the wrong statement regarding the circulatory system of frog

• Sinus venosus receives blood through major veins called vena cava

• The ventricle opens into a sac like conus arteriosus

• The erythrocytes are nucleated

• Special venous connection between liver and intestine called renal portal system is present

• Special venous connection between liver and intestine called renal portal system is present

Read the following statements and choose the correct answer.

i. Gap junctions cement adjacent cells together

ii. Areolar tissue contains fibroblasts, macrophages and mast cells

iii. Tight junctions facilitate the cells to communicate with each other

iv. Adhering junctions help to stop substances from leaking across tissues

v. Cells of connective tissue except blood secrete fibres of structural proteins called elastin

• i, ii and iii only are wrong

• i, iii and iv only are wrong

• iii and v only are wrong

• i, ii and v only are wrong

• i, ii and v only are wrong

Tendons, which attach one bone to another bone are made up of

• Dense regular connective tissue

• Dense irregular connective tissue

• Areolar tissue

• Adipose tissue

• Adipose tissue

In the circulatory system of Pheretima, A, B, C and D represents

• A - Lateral hearts; B - Sub neural vessel; C - Commissural vessel; D - Lateral oesophageal vessel

• A - Lateral hearts; B - Lateral oesophageal vessel; C - Sub- neural vessel; D - Commissural vessel

• A - Lateral hearts; B - Commissural vessel; C - Sub- neural vessel; D - Lateral oesophageal vessel

• A - Commissural vessels; B - Lateral hearts; C - Lateral oesophageal vessel; D - Sub- neural vessel

• A - Commissural vessels; B - Lateral hearts; C - Lateral oesophageal vessel; D - Sub- neural vessel

The structure in earthworm which serves as a wedge to force open cracks in the soil is

• Peristomium

• Setae

• Clitellum

• Typhlosole

• Typhlosole

Which among these is not involved in excretion in cockroaches?

• Malphigian tubules

• Nephrocytes

• Urecose glands

• Maxillary palps

• Maxillary palps

Frogs

• are uricotelic

• have olfactory lobes in the midbrain

• do not have renal portal system

• have lymphatic system

• have lymphatic system

Which one is a specialized connective tissue among these?

• Adipose tissue

• Bone

• Areolar tissue

• Fibroblasts

• Fibroblasts

Role of calciferous glands in the stomach of earthworm is to

• Neutralize the humic acid in the humus

• Produce HCI

• Emulsify fats

• Increase the absorptive area

• Increase the absorptive area