In the Western Ghats biodiversity hotspot, what percentage of plant species are endemic to India?

The correct answer is B: Approximately 60%. The Western Ghats contains about 60% endemic plant species, making it one of India's most critical biodiversity areas.

Which of the following phyla contains organisms with a true coelom and bilateral symmetry?

The correct answer is C: Annelida. Annelida possesses true coelom (eucoelomate) and bilateral symmetry, unlike Porifera (no symmetry), Cnidaria (radial symmetry), and Platyhelminthes (pseudocoelom or acoelomate).

Which hormone primarily regulates sodium reabsorption in the distal convoluted tubule and collecting duct?

The correct answer is B: Aldosterone. Aldosterone, released by the adrenal cortex, increases sodium reabsorption via mineralocorticoid receptors in the DCT and collecting duct.

According to the Convention on Biological Diversity (CBD) which India ratified, what is the current target for protecting land-based ecosystems?

The correct answer is B: 30% by 2030. The CBD's post-2020 global biodiversity framework targets 30% land protection by 2030, known as the '30 by 30' target.

The hormone that increases blood glucose concentration is:

The correct answer is B: Glucagon. Glucagon, secreted by alpha cells of pancreatic islets, increases blood glucose through glycogenolysis and gluconeogenesis.

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NEET Zoology
Genetics & Evolution

Zoology questions for NEET UG — Animal Kingdom, Human Physiology, Genetics, Evolution.

27 Q 6 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–27 of 27

Topics in NEET Zoology

All Animal Kingdom 100 Human Physiology 100 Genetics & Evolution 100 Reproductive Health 100 Ecology & Environment 100 Biotechnology & Applications 40

Q.21 Easy Genetics & Evolution

Gene mutation is defined as:

A Change in allele frequency in a population

B Permanent alteration in DNA sequence

C Crossing over during meiosis

D Separation of homologous chromosomes

Correct Answer: B. Permanent alteration in DNA sequence

EXPLANATION

Mutation is a permanent change in the DNA sequence that can occur spontaneously or be induced. It is the source of genetic variation.

Test

Q.22 Easy Genetics & Evolution

A cross between a homozygous dominant (AA) and homozygous recessive (aa) individual produces offspring that are all:

A Homozygous dominant (AA)

B Heterozygous (Aa)

C Homozygous recessive (aa)

D Mixed phenotypes

Correct Answer: B. Heterozygous (Aa)

EXPLANATION

AA × aa produces all Aa offspring (test cross principle). All offspring are heterozygous with dominant phenotype.

Test

Q.23 Easy Genetics & Evolution

Which of the following best describes alleles?

A Different forms of the same gene at a locus

B Different genes on different chromosomes

C Proteins produced by genes

D Mutations in non-coding DNA

Correct Answer: A. Different forms of the same gene at a locus

EXPLANATION

Alleles are alternative forms of a gene that occupy the same locus on homologous chromosomes and control different variations of the same trait.

Test

Q.24 Easy Genetics & Evolution

In a monohybrid cross between two heterozygous individuals (Aa × Aa), what is the probability of homozygous recessive offspring?

A 1/4

B 1/2

C 3/4

D 1/8

Correct Answer: A. 1/4

EXPLANATION

Monohybrid cross Aa × Aa produces genotypic ratio 1 AA : 2 Aa : 1 aa. Probability of aa (homozygous recessive) = 1/4 or 25%.

Test

Q.25 Easy Genetics & Evolution

Which law states that traits are inherited through discrete units?

A Law of Segregation

B Law of Independent Assortment

C Law of Dominance

D Hardy-Weinberg Principle

Correct Answer: A. Law of Segregation

EXPLANATION

Mendel's Law of Segregation states that hereditary traits are controlled by discrete units (genes) that separate during gamete formation.

Test

Q.26 Easy Genetics & Evolution

What is the chromosome number in a normal human somatic cell?

A 23

B 46

C 92

D 48

Correct Answer: B. 46

EXPLANATION

Humans have 46 chromosomes (23 pairs) in somatic cells - 22 pairs of autosomes and 1 pair of sex chromosomes (XX or XY).

Test

Q.27 Easy Genetics & Evolution

Which of the following is the basic unit of heredity?

A Gene

B Chromosome

C Nucleotide

D Codon

Correct Answer: A. Gene

EXPLANATION

A gene is the fundamental unit of heredity that carries information for a specific trait. It consists of a segment of DNA coding for a protein or RNA.

Test

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NEET Zoology Genetics & Evolution

NEET Zoology
Genetics & Evolution