genetics, evolution of life & ecological biodiversity - Category wise Question and Answer Practice Test with Solutions

genetics, evolution of life & ecological biodiversity PRACTICE TEST [5 - EXERCISES]

set 1

set 2

set 3

set 4

set 5

Question : 1

From a cross AABb x aaBb, the genotypes AaBB : AaBb : Aabb : aabb will be obtained in the following ratio

a) 1: 2 : 1 : 0

b) 0 : 3 : 1 : 0

c) 1: 1 : 1 : 1

d) 1: 1 : 1 : 0

Answer: (a)

AABb × aaBb

AB Ab AB Ab
aB AaBB AaBb AaBB AaBb
aB AaBb Aabb AaBb Aabb
aB AaBB AaBb AaBB AaBb
ab AaBb Aabb AaBb Aabb
AaBB : AaBb : Aabb : aabb
4 : 8 : 4 : 0

AaBB = 1; AaBb = 2; Aabb = 1; aabb = 0

Question : 2 [UP (Pre) 1998]

Dinosaurs were in

a) Mesozoic era

b) Paleozoic era

c) Cenozoic era

d) Pleistocene era

Answer: (a)

Question : 3

ICBN stands for

a) Indian Code of Botanical Nomenclature

b) International Code of Botanical Nomenclature

c) International Congress of Biological Names

d) Indian Congress of Biological Names.

Answer: (b)

ICBN (International Code of Botanical Nomenclature) - It is one of the codes of nomenclature which is independent of zoological and bacteriological nomenclature.

The code applies equally to names of taxonomic groups treated as plants whether or not these groups were originally so treated.

Question : 4

Energy is maximum in ................ trophic level and minimum in the ............... trophic level

a) top, Bottom

b) producer, consumer

c) consumer, decomposer

d) bottom, Top

Answer: (d)

A. Producers are the green plants which synthesise their own food using sunlight.

B. Herbivores are primary consumers who feed on producers.

C. Carnivores are secondary consumers who feed primary consumers.

D. Top carnivores are tertiary consumers who feed on other carnivores.

Maximum energy is stored in the trophic levels of producers as they synthesise their own food. They occupy the lowest trophic level and energy is transferred from them to higher subsequent trophic levels. As the energy decreases each time it is transferred to the next higher trophic level, the lowest trophic level i.e. producers, have maximum energy.

Question : 5

The accumulation of non-biodegradable substances in a food chain in increasing amount at each higher trophic level is known as:

a) Pollution

b) Accumulation

c) Eutrophication

d) Bio magnification

Answer: (d)

Non-biodegradable substances like pesticide residues cannot be digested or consumed by organisms, so, they are just passed on to organisms of the next trophic level along with food. These non-biodegradable residues keep on accumulating.

The higher the trophic level an organism occupies in the food chain higher will be the accumulation of non-biodegradable pesticide residues.

This phenomenon is called biomagnification. So, the correct answer is 'Biomagnification'

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