NEET Test 119

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NEET Test 119

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Weekly Quiz Competition

Question 1
4 / -1

Connecting link between meiosis I and meiosis II is:

A
Interphase I

B
Interphase II

C
Interkinesis

D
Anaphase I

Solution

Interkinesis is brief intra meiotic interphase, which is found in some cases in order to synthesize deficient biochemicals. DNA synthesis does not occur in this phase of the cell cycle.

Hence, the correct option is (C).
Question 2
4 / -1

Two competing species evolve different patterns of resource use so as to avoid competition. In which of the following types of niche differentiation can the partitioning be on a daily scale?

A
Temporal partitioning

B
Resource partitioning

C
Spatial partitioning

D
Morphological differentiation

Solution

Conditional differentiation (sometimes called temporal niche partitioning) occurs when species differ in their competitive abilities based on varying environmental conditions. For example, in the Sonoran Desert, some annual plants are more successful during wet years, while others are more successful during dry years.

Hence, the correct option is (A).
Question 3
4 / -1

In Kranz anatomy, the bundle sheath cells have:

A
Thin walls, many intercellular spaces and no chloroplasts.

B
Thick walls, no intercellular spaces and a large number of chloroplasts.

C
Thin walls, no intercellular spaces and several chloroplasts.

D
Thick walls, many intercellular spaces and few chloroplasts.

Solution

In Kranz anatomy, the bundle sheath cells have thick walls, no intercellular spaces and a large number of chloroplasts.

Kranz anatomy occurs in the chloroplast of C₄ plants such as sugarcane, maize (Zea mays), sorghum etc. It has two types of the photosynthetic cell arranged in a specific manner. These are bundle sheath cells that surround the vascular centres, and mesophyll cells that, in turn, surround the bundle sheath cells. Rubisco is localised only within internalised bundle sheath cells which helps in fixation of carbon dioxide. The bundle sheath cells have thick walls, no intercellular spaces and a large number of chloroplasts.

Hence, the correct option is (B).
Question 4
4 / -1

If the electron in the hydrogen atom jumps from the third orbit to the second orbit, the wavelength of the emitted radiation in term of Rydberg constant is:

A

B

C

D

Solution

As given, in the hydrogen atom jumps from the third orbit to the second orbit
Question 5
4 / -1

A candle of diameter ′d′ is floating on a liquid in a cylindrical container of diameter ′D′(D >>d) as shown in the figure. If it is burning at the rate of 2 cm/ℎ, the top of the candle will

A
Remain at the same height

B
Fall at the rate of 1 cm / h

C
Fall at the rate of 2 cm / h

D
Go up at the rate of 1 cm / h

Solution

From Archimedes' principle this apparent loss in weight is equal to the weight of the liquid displaced by the body.
Question 6
4 / -1

A particle of mass 0.1kg is held between two rigid supports by two springs of force constant 8 Nm⁻¹ and 2Nm⁻¹. If the particle is displaced along the direction of length of the springs, its frequency of vibration is:

A

B

C

D

Solution
Question 7
4 / -1

0.73 g of organic compound on oxidation gave 1.32 g of carbon dioxide. The percentage of carbon in the given compound will be:

A
49.32

B
59.32

C
29.32

D
98.64

Solution
Question 8
4 / -1

Which of the following statements is correct?

a. rRNA is the most abundant RNA.

b. Ribosomes are composed of approximately 80% rRNA and 20% ribosomal proteins.

c. rRNA is a type of coding RNA.

A
Statements 'a', 'b' and 'c' are correct

B
Statement 'a' is correct

C
Statements 'a' and 'c' are correct

D
Statements 'b' and 'c' are correct

Solution

rRNA is most abundant in the cell. It constitutes 80% of the total RNA of the cell. Ribosomes are composed of approximately 60% rRNA and 40% ribosomal proteins. rRNA is a type of non-coding RNA.

Hence, the correct option is (B).
Question 9
4 / -1

Tendons connect the following:

A
Bone to bone

B
Muscle to muscle

C
Cartilage to muscle

D
Bone to muscle

Solution

Tendons connect the bone to muscle.

A tendon is a fibrous connective tissue which attaches bone to muscle. Tendons may also attach muscles to structures such as the eyeball. A tendon serves to move the bone or structure. A ligament is a fibrous connective tissue which attaches bone to bone, and usually serves to hold structures together and keep them stable.

Hence, the correct option is (D).
Question 10
4 / -1

Arrange the following acids in decreasing order of acidity.

1. HCOOH

2. CH₃COOH

3. FCH₂COOH

4. NO₂CH₂COOH

5. C₆H₅COOH

A
1 > 2 > 3 > 4 > 5

B
2 > 5 > 1 > 3 > 4

C
4 > 3 > 1 > 5 > 2

D
4 > 1 > 3 > 2 > 5

Solution

Very simple, as +I groups are attached to a carboxylic acid, the acidic nature decreases. As the size of +I groups increases, the acidity decreases proportionally. Whereas the -I groups enhance the acidity. As in alcohols, the acidity is dependent on the same factors in the same way but compared to carboxylic acids, alcohols are less acidic due to their weak alkoxide ion (RO-). As the aromatic groups are connected, the acidic nature is enhanced due to resonance. So an aromatic carboxylic acid is more acidic than its aliphatic counterpart.

The order of acidity therefore is,

4 > 3 > 1 > 5 > 2

Hence, the correct option is (C).