Organisms and Populations Questions

Select the correct pair of adaptations to environment in desert lizards:(a) Burrowing in soil to escape high temperature(b) Losing heat rapidly from the body during high temperature(c) Bask in sun when temperature is low(d) Insulating body due to thick fatty dermis

Praying mantis is a good example of:

The formula for exponential population growth is :

Niche overlap indicates

Annual migration does not occur in the case of:

Which two of the following statements about the kangaroo rat are true?(a) Dark colour, high reproduction rate, solid urine.(b) Do not drink water, breathe slow, covered in thick hair.(c) Feed on dry seeds and do not require drinking water.(d) Excrete very concentrated urine and do not use water for thermoregulation.

Which two of the following changes usually occur in plain dwellers when they move to high altitudes ($3,500\text{m}$ or more)?(a) Increase in red blood cell size(b) Increase in red blood cell production(c) Increased breathing rate(d) Increase in thrombocyte count

Study the four statements ($\text{a-d}$) and select the two correct ones:(a) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers.(b) Predator star fish Pisaster helps in maintaining species diversity of some invertebrates.(c) Predators ultimately lead to the extinction of prey species.(d) Production of chemicals such as nicotine by plants are metabolic disorders.

The figure given below is a diagrammatic representation of response of organisms to abiotic factors. What do $a,b$ and $c$ represent respectively?

Cuscuta is an example of:

Gause's principle of competitive exclusion states that:

When does the growth rate of a population following the logistic model equal zero? The logistic model is given as $dN/dt=rN(1-N/K)$:

The primary producers of the deep-sea hydrothermal vent ecosystem are:

Which of the following is correct for $r$ -selected species?

The principle of competitive exclusion was stated by: