Which of the following is not a function of predators?

(1) They act as conduits for energy transfer across trophic levels

(2) They keep prey populations under control

(3) They help in the stabilization of the ecosystems

(4) They decrease the species diversity in a community

Very small animals are rarely found in polar region mainly because:

1. Smaller animals have a relatively slower heart rate

2. Smaller animals have a more surface area relative to their volume

3. Smaller animals are invariably herbivores

4. Smaller animals rely on diffusion for exchange of gases with the environment

When the population density reaches the carrying capacity, the logistic growth curve is said to be in:

1. Lag phase

2. A phase of acceleration

3. A phase of deceleration

4. Asymptote

In general, which of the following is not an adaptation seen in parasites in accordance with their life style?

1. Loss of unnecessary sense organs

2. Presence of adhesive organs

3. Low reproductive capacity

4. Loss of digestive system

I. Organisms living in oceans, lakes and rivers face water-related problems.
II. Euryhaline can tolerate a wide range of salinities
III. Stenohaline are restricted to a narrow range of salinities
IV. No fresh water animals cannot live for long in sea water but sea animals can live in fresh water for long time because of osmotic balance
V. The salt concentration is less than 5% in inland water, 30-35% in sea and >100% in some hypersaline lagoons.

(1) All are correct                     

(2) All are false

(3) Only IV is wrong                 

(4) Only I, III, V are correct

Which of the following term implies the maintenance of relatively constant physical and chemical conditions with organisms?

(1) Homeostasis   

(2) Adaptation      

(3) Isometry         

(4) Acclimation

Human can get homeostasis through:

(1) Only physiological means

(2) Only physical means

(3) Both physiological and physical means

(4) Neither physiological nor physical means

Which of the following statement is false?
(1) Osmoconformors are able to maintain homeostasis by physiological means or sometimes behavioural means also which ensure constant body temperature, constant osmotic concentration etc
(2) All birds and mammals, and a very few lower vertebrates and invertebrates are capable of osmoregulation and thermoregulation
(3) Thermoregulation is the major reason of the success mammals
(4) Sweating and shivering are the means of thermoregulation by humans

Why small animals are not found in polar area mostly?

(1) Because they have a smaller surface area relative to their volume

(2) Because they have a larger volume relative to their surface area

(3) Because they have a smaller metabolic rate

(4) Because they have a larger surface area relative to their volume

Kangaroo rats:

(1) Have a generalized diet               

(2) Avoid eating fats

(3) Do not need to drink water          

(4) Are insensitive to heat