Question 1

Why are the classification systems changing every new and then?

Accepted Answer

(i) Organisms exhibit a great deal of variation in their form, structure, mode of life etc.
(ii) Sometimes morediversity is exhibited then suspected.
(iii) New classification may represent better relationship amongst organisms.
(iv) New changed system may be a better incoherence and definable characters.

Question 2

What different criteria, would you choose to classify people, that you meet often?

Accepted Answer

The various criteria that may be chosen to classify people whom we meet often include behaviour, geographical location, morphology, gender, family members etc.
Geographical location of the individual defines their ability to adapt to the environment.
The morphology or phenotype of the organism and the behavior is responsible for differentiating humans.
Gender also helps in the major classification of humans that helps in the population studies.

Question 3

Which of the following pairs contributes to an increase in population?

Accepted Answer

[A] Natality is the proportion of births to the total population in a place at a given time, while mortality is the death rate per thousand individuals. Immigration is the movement of individuals into an area and emigration is movement if individuals out of an area. Therefore, natality and immigration will increase population.

Question 4

Carrying capacity is -

Accepted Answer

[A] Maximum number of individuals which the environment can sustain is referred to as its carrying capacity.

Question 5

The branch of Botany dealing with the distribution of plants on the earth's surface is called

Accepted Answer

Term 'phytogeography' is made up of two words phyton = plant and geography i.e. geography of plant distribution.

Question 6

Population whose members reproduce asexually are termed

Accepted Answer

Apomixis is the formation of new individuals directly through asexual reproduction without involving the formation and fusion of gamete. So, those population whose members reproduce by the process of apomixis are called apomictic.

Question 7

Who defined ecology as the study of form, function and factor

Accepted Answer

The famous Indian ecologist, professor R. Misra of Banaras Hindu University has defined ecology as interactions of form, functions and factors.

Question 8

Human population growth in India

Accepted Answer

Human population growth in India can be regulated by following the national programme of family planning. India was the first country in the world to have launched a National Programme for Family Planning in 1952.

Question 9

The present population of the world is about

Accepted Answer

World population has reached 8 billion people in 2022 according to the United Nations.

Question 10

Which one is true?

Accepted Answer

Symbiosis when the interaction is useful to both the populations. The symbiotic relationship between an anemone (Heteractis magnifica) and a clownfish (Amphiron ocellaris) is a classic example of two organisms benefiting the other; the anemone provides the clownfish with protection and shelter, while the clownfish provides the anemone nutrients in the form of waste while also scaring off potential predator fish.

Question 11

Which part of the world has a high density of organisms?

Accepted Answer

Tropical rain forests occur in equatorial and subequatorial regions. The forests receive all the external inputs for optimum plant growth. Due to abundant plant growth, a large number of animals live in tropical rain forests. In grasslands fire occur periodically which prevent tree growth. In savannah periods of drought are common. In deciduous forests are found predominantly broad leaved hard wood deciduous trees.

Question 12

Competition for light, nutrients and space is most severe between

Accepted Answer

Competition is most severe between the members of a population belong to same niches.

Question 13

In a population unrestricted reproductive capacity is called as

Accepted Answer

Carrying capacity refers to the maximum number of individuals that can be sustained by the environment. Birth rate refers to number of births per unit population.

Question 14

What is the keystone species?

Accepted Answer

A keystone species is the one which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the community's organization and survival.

Question 15

Feeding zone of soil refers to :

Accepted Answer

Feeding zone stands for the top 4-6 inches thick fertile soil of A-horizon which supplies nutrients and minerals to roots of the crop plants.

Question 16

Lithosphere is richest in:

Accepted Answer

Lithosphere is richest in oxygen (nearly 50%v/v ) followed by silicates, bases and iron or aluminium. Oxygen occurs in all minerals found in oxides, silicates, carbonate or sulphate forms, e.g. Fe2​O4​, Al2​O3​,SiO2​,K2​Al2​Si6​O16​,CaO,CaCO3​, MgCO3​,CaSO4​MnSO4​,MgSO4​, etc.

Question 17

Holard includes :

Accepted Answer

Holard includes all forms of moisture present in a well drained soil (after draining of gravitational moisture) in the form of chemically combined moisture, hygroscopic moisture and capillary moisture.

Question 18

pF scale measures:

Accepted Answer

pF scale measures the soil moisture or capillary potential of soil and it ranges from 0 to 7 . Zero pF is for the waterlogged soil and 7pF value is for ignited soil having no trace of moisture, pF value is for ignited soil having no trace of moisture. pF of oven dry soil is 6.9 Lesser the moisture in soil, more its pF value.

Question 19

The ability of a surface to reflect incoming radiation is:

Accepted Answer

The ability of a surface to reflect incoming radiation is called Albido value. It is maximum in areas covered with fresh snow (more than 80-85\% incoming radiation is reflected) and minimum in thick forest which reflects only 5−10 radiations.

Question 20

In Humus, C:N ratio is :

Accepted Answer

Humus always maintain a constant C:N ratio as 10:1. It does not very much, no matter whether the humus is derived from decaying animal debris or plant debris, Brown colour of humus is mainly due to lignio-proteins.

Filters

Filters

book

topic

concept

difficulty

Solutions for Biology-for-NEET-Volume-2-Class-XII by Career Point, Organisms and Populations

Found the solution, but did not understand the concept?

Ask my first question