Mortality, Natality and Dispersal

Q.

The apneustic centre increases the depth of___(i)____ by acting directly on the ___(ii)____ centre. The pneumotaxic centre inhibits the ___(iii)____ centre, thus increasing the respiratory rate i.e the duration of inspiration and expiration___(iv)____.

1. i) $\to$ Inspiration, ii) $\to$ Inspiratory, iii) $\to$ Expiratory, iv) $\to$ Decreases

2. i) $\to$ Expiratory, ii) $\to$ Inspiratory, iii) $\to$ Expiration, iv) $\to$ Increases

3. i) $\to$ Inspiration, ii) $\to$ Inspiratory, iii) $\to$ Expiration, iv) $\to$ Decreases

4. i) $\to$ Expiration, ii) $\to$ Expiratory, iii) $\to$ Inspiratory, iv) $\to$ Increases

Q.

What determines single characteristics in a species?

Q.

Are species and populations the same thing?

Q. Which of the following is not true for a species?

1. Members of a species can interbreed
2. Variations occur among members of a species
3. Gene flow does not occur between the populations of a species
4. Each species is reproductively isolated from every other species

Q. Which of the following sentence(s) are NOT true?

1. Natural selection always operates at the population level.
2. Genes of an individual denotes the fitness of the gene pool.
3. Individual genes lost are insignificant and does not signify the fitness of the gene pool.
4. If the gene pool is not fit the species will go extinct.

Q. In a pond, last year there were 30 lotus plants. Through reproduction, 25 new lotus plants were added in one year while 8 plants died. The birth and death rates for the lotus population respectively are ____ and ____ individuals per lotus per year.

1. 0.83, 0.26
2. 0.26, 0.83
3. 0.25, 0.80
4. 0.80, 0.25

Q.

What makes a species unique?

Q. Two opposite forces operate in the growth and development of every population. Once of them relates to the ability to reproduce at a given rate. The force opposing it is called.

1. Morbidity
2. Fecundity
3. Biotic potential
4. Environmental resistance

Q. In a pond, last year there were 30 lotus plants. Through reproduction, 25 new lotus plants were added in one year while 8 plants died. The birth and death rates for the lotus population respectively are ____ and ____ individuals per lotus per year.

1. 0.83, 0.26
2. 0.26, 0.83
3. 0.25, 0.80
4. 0.80, 0.25

Q. Which of the following is/are an attribute for population?

1. Age pyramid
2. Mortality
3. Natality
4. All the above

Q. Which of the following is/are an attribute for population?

1. Age pyramid
2. Mortality
3. Natality
4. All the above

Q. All the members of a single species occupying a particular area is termed a ___

1. Population
2. Community
3. Gene pool
4. Neighbourhood