A set of characters for desert adaptation are

1. Respiratory roots, salt secreting glands, C₄ cycle

2. Turions, thick cuticle on leaf surface, CAM pathway

3. Phylloclade, stomatal pits, CAM pathway

4. Phyllode, aerenchyma, high OP of cell sap

Verhulst-Pearl population growth is described by the equation

1. $\frac{dN}{dt}$ = rN

2. N_t = N₀e^rt

3. N_t = N₀+B+l-D-E

4. $\frac{dN}{dt}$ = rN$\left(\frac{K-N}{K}\right)$

Choose the odd one out with respect to adaptations in organisms

1. Altitude sickness in humans is a physiological means to counteract the stressful condition

2. Biochemical adaptations are seen in organisms present at great depths in oceans

3. Allen's rule is seen in mammals of colder climate

4. Desert lizards lack the physiological and behavioural means to manage their body temperature

Choose the odd one out with respect to structure formed in the different organisms during suspended phase

1. Bacteria, fungi               -  Thick wall spores

2. Higher plants                 -  Seed, vegetative propagules

3. Zooplanktons                 -  Diapause stage

4. Ectothermic organisms    -  Torpid state during favourable season

Natural selection operates at the level of :-

1. Organism

2. Population

3. Community

4. Ecosystem

Regional and local variations within each biome lead to the formation of a wide variety of:-

1. Niche

2. Population

3. Microclimate

4. Habitat

Match the column A with column B :-

               A                                                 B                 

a. phytophagous insects           i) A stage of suspended development 

b. Diapause                            ii) To avoid summer related problem 

c. Homeostasis                       iii) feeding on plant sap

d. Aestivation                        iv) Maintenance of constant internal environment 

1. a-(iv), b(ii), c-(iii), d-(i)

2. a-(iii), b(i), c-(iv), d-(ii)

3. a-(i), b(iii), c-(ii), d-(iv)

4. a-(iii), b(ii), c-(iv), d-(i)

Ecology explains us:-

ln the given figure, identify Coniferous forest, Arctic and Alpine Tundra and tropical forest, respectively:-

1. l, Vl and lll

2. V, Vl and lll

3. lV, lll and l

4. l, ll and lll

Formation of wide variety of habitats takes place by:-

1. Types of species inhabiting that area

2. Types of predation

3. Regional and local variation of environment conditions

4. All of the above