NEET Test 8

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NEET Test 8

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Weekly Quiz Competition

Question 1
4 / -1

The bond order is maximum in-

A
CO

B
N₂⁺

C
O₂

D
O₂^2-

Solution

bond order is the number of chemical bonds between a pair of atoms in a molecule.
CO has 3 bonds between C and O, the bond order is 3
N₂⁺ has bond order 2.5
O₂ has bond order 2
O₂^2- has bond order 1
Question 2
4 / -1

In cattle, the coat colour red and white are two dominant traits, which express equally in F1 to produce roan (red and white colour in equal proportion). If F1 progeny are self-bred, the resulting progeny in F2 will have phenotypic ratio (red:roan:white) is

A
1:1:1

B
3:9:3

C
1:2:1

D
3:9:4

Solution

Coat colour in cattle is an example of co-dominance. Thus the two dominant phenotypes express equally in the progenies. If the F1 individuals are self-bred then the phenotypic ration will be 1:2:1. The genotypic and phenotypic ratios are the same in case of a codominant monohybrid cross.
Question 3
4 / -1

The following ratio is generally constant for a given species:

A
A+G/C + T

B
T+C/G+A

C
G+C/A+T

D
A+C/T+G

Solution

The ratio of A + T/G + C may vary from one species to another, but is constant for a given species, it is rarely equal to one and varies between 0.4 and 1.9.
Question 4
4 / -1

In sponges, digestion of food completes in

A
Choanocytes

B
Intercellular

C
Paragastric cavity Intercellular

D
Spongocoel

Solution

Digestion of food in sponges completes in choanocytes. Choanocytes are also known as collar cells.
Question 5
4 / -1

Which of the following is not true about phylum porifera?

A
Digestion is intracellular

B
Multicellular with cellular level of organization

C
Fertilization is internal

D
They are only present in marine water and are mostly radially symmetrical

Solution

Porifera are generally marine but some are fresh water. And they are mostly asymmetric.
Question 6
4 / -1

By what is Taenia solium attached to the intestinal mucosa

A
Rostellum

B
Acetabulum

C
Scolex

D
Proglottids

Solution

Taenia solium is attached to the intestinal mucosa by rostellum which is a knob like protruding part of the anterior end of tapeworms.
Question 7
4 / -1

Which of the following fish has tough skin containing minute placoid scales?

A
Betta

B
Hippocampus

C
Scoliodon

D
Labeo

Solution

Scoliodon has minute placoid scales. Thus, they have tough skin.
Question 8
4 / -1

The upright pyramid of number is absent in

A
Pond

B
forest

C
Lake

D
grassland

Solution

The pyramid of number depicts number of organisms at each trophic level in a food chain. The pyramid of number is not upright in case of a forest ecosystem but is inverted in shape. Upright pyramid of number is observed in pond, lake and grassland ecosystems.
Question 9
4 / -1

Which of the two climatic factors helps soil microbes to fasten the rate of decomposition.

A
Temperature and soil moisture

B
Soil pH and aeration

C
aeration and temperature

D
Soil moisture and soil pH

Solution

temperature and availability of soil water and chemical components of detritus play an important role in litter decomposition. The rate is high in tropical climate because of high temperature and high soil moisture while it is slow in temperate climates.
Question 10
4 / -1

Standing crop is defined as:

A
Each trophic level has a certain mass of living material at a particular time.

B
Each trophic level has a certain mass of non-living material at a particular time.

C
Both of these

D
None of these

Solution

the standing crop is measured as the mass of living organism or the number in a unit area.
It is defined as a certain mass of living material at a particular time at each trophic level.
Standing state is defined as a certain mass of non living material at a particular time.
Question 11
4 / -1

during ecological succession

A
The gradual and predictable change in species Composition occurs in a given area

B
The establishment of a new biotic community very fast in its primary phase

C
The numbers and types of animals re Constant

D
The changes lead to a community that is in equilibrium with the environment and is cal pioneer community.

Solution

The gradual and fairly predictable change in species composition of a given area is ecological succession. During ecological succession, some species start to colonize an area and their populations become more numerous. Due to limitation of resources populations of other species decline and even disappear.

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NEET Test 8

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NEET Test 8

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SHARING IS CARING

Question 1

CO

N2+

O2

O22-

Solution

Question 2

1:1:1

3:9:3

1:2:1

3:9:4

Solution

Question 3

A+G/C + T

T+C/G+A

G+C/A+T

A+C/T+G

Solution

Question 4

Choanocytes

Intercellular

Paragastric cavity Intercellular

Spongocoel

Solution

Question 5

Digestion is intracellular

Multicellular with cellular level of organization

Fertilization is internal

They are only present in marine water and are mostly radially symmetrical

Solution

Question 6

Rostellum

Acetabulum

Scolex

Proglottids

Solution

Question 7

Betta

Hippocampus

Scoliodon

Labeo

Solution

Question 8

Pond

forest

Lake

grassland

Solution

Question 9

Temperature and soil moisture

Soil pH and aeration

aeration and temperature

Soil moisture and soil pH

Solution

Question 10

Each trophic level has a certain mass of living material at a particular time.

Each trophic level has a certain mass of non-living material at a particular time.

Both of these

None of these

Solution

Question 11

The gradual and predictable change in species Composition occurs in a given area

The establishment of a new biotic community very fast in its primary phase

The numbers and types of animals re Constant

The changes lead to a community that is in equilibrium with the environment and is cal pioneer community.

Solution

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N₂⁺

O₂

O₂^2-