In the equation, $\frac{d\mathrm{N}}{d\mathrm{t}} = r\mathrm{N}\left(\frac{\mathrm{K} - \mathrm{N}}{\mathrm{K}}\right)$ where r stands for

• Intrinsic rate of natural increase

• Death rate

• Population density at time t

• Carrying capacity

• Carrying capacity

Match Column I with Column II and choose the right option.

Column I	Column II
1. Thomas Malthus	A. Branching descent
2. Hugo deVries	B. Studies on populations
3. Charles Darwin	C. Use and disuse theory
4. Lamarck	D. Saltation

• 1 - D; 2 - A; 3 - C; 4 - B

• 1 - B; 2 - D; 3 - A; 4 - C

• 1 - B; 2 - D; 3 - C; 4 - A

• 1 - C; 2 - B; 3 - A; 4 - D

• 1 - C; 2 - B; 3 - A; 4 - D

203.

The following figure given below is a diagrammatic representation of organismic response to abiotic factors. What do (a), (b) and (c) represent respectively?

• (A) Conformers (B) Regulators (C) Partial regulators

• (A) Regulators (B) Partial regulators(C) Conformers

• (A) Partial regulators (B) Regulators (C) Conformers

• (A) Partial regulators (B) Conformers (C) Regulators

• (A) Partial regulators (B) Conformers (C) Regulators

Allen's rule applies to

• Tribes living in high altitudes

• Mammals from colder climates

• Fish living in Antarctic waters

• Desert lizards

• Desert lizards

Pick out the correct option from (a) to (e)

(A) Primary succession begins in areas where natural communities have been destroyed

(B) Hydrarch succession takes place in water

(C) The climax community is the community that is in near equilibrium with the immediate environment

(D) In newly cooled lava secondary succession occurs

• (A) and (B) are correct, (C) and (D) are incorrect

• (B) and (C) are correct, (A) and (D) are incorrect

• (A) and (D) are correct, (B) and (C) are incorrect

• (B) only is correct, (A), (C) and (D) are incorrect

• (B) only is correct, (A), (C) and (D) are incorrect

Many fresh water animals cannot live for long in sea water mainly because of the

• Change in the atmosphere

• Change in the levels of thermal tolerance

• variations in light intensity

• Osmotic problems they would face

• Osmotic problems they would face

Match mean annual precipitation in Column I with the biome in Column II and choose the right option.

Column I	Column II
1. 0-50 cm	A. Tropical forest
2. 50-100 cm	B. Coniferous forest
3. 150-400 cm	C. Grassland
4. 50-250 cm	D. Desert

• 1 - D; 2 - C; 3 - A; 4 - B

• 1 - C; 2 - A; 3 - B; 4 - D

• 1 - C; 2 - D; 3 - A; 4 - B

• 1 - B; 2 - D; 3 - A; 4 - C

• 1 - B; 2 - D; 3 - A; 4 - C

The asscoiation that includes herbivores and phytophagous insects is called

• Competition

• Parasitism

• Predation

• Commensalism

• Commensalism

The number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration is known as

• Emigration

• Mortality

• Natality

• Immigration

• Immigration

In a species, the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weights from 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taking place?

• Stabilizing Selection

• Disruptive Selection

• Cyclical Selection

• Directional Selection