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

Which of these is/are wrongly matched?

(1) Alkaloid - Codeine

(2) Lectin - Morphine - Morphine

(3) Toxin - Abrin

(4) Terpene - Curcumin

• (1) and (3) only

• (2) and (3) only

• (2) and (4) only

• (3) and (4) only

• (3) and (4) only

Which of the following feature(s) is/are common to both wind and water pollinated flowers?

I. Pollen grains are long and ribbon-like.

II. Stigma is large and feathery.

III. The flowers are not colourful.

IV. The flowers do not produce nectar.

• III and IV only

• II and III only

• I and II only

• II only

• II only

Select the plants pollinated by water

(A) Water hyacinth

(B) Zostera

(C) Amorphophallus

(D) Vallisneria

(E) Yucca

• (A), (D) and (E) only

• (B) and (E) only

• (B) and (D) only

• (B), (C) and (D) only

• (B), (C) and (D) only

The breakdown of detritus into small particles by detritivores is called

• Leaching

• Humification

• Catabolism

• Mineralization

• Mineralization

Which of the following statements regarding responses of organisms to abiotic factors is false?

• All birds and mammals are capable of thermoregulation.

• Majority of animals and nearly all plants cannot maintain a constant internal environment.

• Shivering is a kind of exercise which produces heat and raises body temperature.

• Very small animals are commonly found in polar regions as they have to spend less energy to generate body heat

• Very small animals are commonly found in polar regions as they have to spend less energy to generate body heat

An orchid growing as an epiphyte on a mango tree is an example for

• Parasitism

• Predation

• Commensalism

• Mutualism

• Mutualism

80.

The ozone hole over Antarctica develops each year between

• Late December and early February

• Late February and early April

• Late April and early June

• Late August and early October

• Late August and early October