Vidaara.orgClass 8 · Mathematics
CodeVID-M8-WS
Cell Division and Heredity — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
45 × 1 = 45 marks
1.
The process by which one cell divides to form new cells is called:
- A.Respiration
- B.Cell division
- C.Digestion
- D.Diffusion
2.
Which of these is NOT a main reason for cell division?
- A.Growth
- B.Repair
- C.Reproduction
- D.Breathing
3.
An organism grows mainly by:
- A.Making each cell huge
- B.Increasing the number of cells
- C.Losing cells
- D.Stopping division
4.
The healing of a cut on the skin is an example of cell division for:
- A.Reproduction
- B.Repair
- C.Photosynthesis
- D.Digestion
5.
In an Amoeba, cell division mainly serves the purpose of:
- A.Reproduction
- B.Excretion
- C.Breathing
- D.Movement
6.
The orderly sequence of stages from a cell's formation until it divides is the:
- A.Food chain
- B.Cell cycle
- C.Water cycle
- D.Life span
7.
The longest part of the cell cycle, during which the cell grows and prepares, is:
- A.M phase
- B.Interphase
- C.Cytokinesis
- D.Anaphase
8.
DNA is copied (replicated) during which sub-phase of interphase?
- A.G1
- B.S
- C.G2
- D.M
9.
The division of the cytoplasm that splits a cell into two is called:
- A.Mitosis
- B.Cytokinesis
- C.Interphase
- D.Synthesis
10.
Uncontrolled cell division, caused by loss of cell-cycle control, can lead to:
- A.Cancer
- B.Digestion
- C.Photosynthesis
- D.Respiration
11.
Mitosis produces daughter cells that are:
- A.Half the chromosome number
- B.Genetically identical to the parent
- C.Always different
- D.Without a nucleus
12.
The correct order of the stages of mitosis is:
- A.Metaphase, prophase, telophase, anaphase
- B.Prophase, metaphase, anaphase, telophase
- C.Anaphase, telophase, prophase, metaphase
- D.Telophase, anaphase, metaphase, prophase
13.
Chromosomes line up along the middle of the cell during:
- A.Prophase
- B.Metaphase
- C.Anaphase
- D.Telophase
14.
Sister chromatids are pulled apart to opposite poles during:
- A.Prophase
- B.Metaphase
- C.Anaphase
- D.Interphase
15.
Mitosis in the body mainly helps in:
- A.Making gametes
- B.Growth and repair
- C.Reducing chromosome number
- D.Producing variation
16.
Meiosis is the type of cell division that produces:
- A.Body cells
- B.Gametes (sex cells)
- C.Bone cells
- D.Skin cells
17.
The number of daughter cells formed at the end of meiosis is:
- A.Two
- B.Four
- C.Eight
- D.One
18.
A cell with half the normal chromosome number is described as:
- A.Diploid
- B.Haploid
- C.Doubled
- D.Body cell
19.
In humans, a gamete (sperm or egg) carries how many chromosomes?
- A.46
- B.23
- C.92
- D.12
20.
The exchange of genetic material between paired chromosomes in meiosis is called:
- A.Replication
- B.Crossing over
- C.Cytokinesis
- D.Pairing only
21.
Chromosomes are mainly made of:
- A.Fat
- B.DNA (with proteins)
- C.Sugar only
- D.Water
22.
The twisted-ladder shape of DNA is called the:
- A.Triangle
- B.Double helix
- C.Square
- D.Spiral fat
23.
A short section of DNA carrying instructions for one feature is a:
- A.Cell
- B.Gene
- C.Tissue
- D.Organ
24.
A human body cell contains how many chromosomes?
- A.23
- B.46
- C.92
- D.12
25.
The 46 human chromosomes are arranged as:
- A.46 pairs
- B.23 pairs
- C.12 pairs
- D.No pairs
26.
The passing of features from parents to offspring is called:
- A.Nutrition
- B.Heredity
- C.Respiration
- D.Digestion
27.
The "Father of Genetics" is:
- A.Charles Darwin
- B.Gregor Mendel
- C.Louis Pasteur
- D.Robert Hooke
28.
Mendel carried out his famous experiments on:
- A.Maize plants
- B.Garden pea plants
- C.Rose plants
- D.Mango trees
29.
Crossing pure tall × pure short pea plants gave an F1 generation that was:
- A.All short
- B.All tall
- C.Half tall, half short
- D.3 : 1 tall to short
30.
The factors of a trait separate during gamete formation according to the Law of:
- A.Independent Assortment
- B.Segregation
- C.Gravity
- D.Motion
31.
A trait that appears even when only one of its factors is present is:
- A.Recessive
- B.Dominant
- C.Hidden
- D.Lost
32.
The genetic make-up of an organism (e.g. TT, Tt, tt) is its:
- A.Phenotype
- B.Genotype
- C.Species
- D.Habitat
33.
Which genotype produces a short pea plant (t = short, recessive)?
- A.TT
- B.Tt
- C.tt
- D.All of these
34.
An organism with two identical alleles (e.g. TT or tt) for a trait is:
- A.Heterozygous
- B.Homozygous
- C.Recessive only
- D.Dominant only
35.
A plant with genotype Tt is tall because:
- A.t hides T
- B.T is dominant over t
- C.both alleles are recessive
- D.it has no alleles
36.
The sex chromosomes of a human female are:
- A.XY
- B.XX
- C.YY
- D.XO
37.
A human male has the sex chromosomes:
- A.XX
- B.XY
- C.YY
- D.XXY
38.
The sex of a child is determined by the:
- A.Mother's egg
- B.Father's sperm
- C.Number of autosomes
- D.Size of the egg
39.
Which of these is a sex-linked trait?
- A.Tallness in pea
- B.Colour blindness
- C.Seed shape
- D.Pod colour
40.
Haemophilia is a condition in which the blood:
- A.Clots too fast
- B.Does not clot properly
- C.Turns green
- D.Stops flowing
41.
A sudden, permanent change in the DNA or chromosomes is called a:
- A.Mutation
- B.Mitosis
- C.Mineral
- D.Membrane
42.
A change in the DNA of a single gene is a:
- A.Chromosomal mutation
- B.Gene mutation
- C.Cell cycle
- D.Phenotype
43.
Down syndrome is caused by an extra copy of chromosome number:
- A.23
- B.21
- C.1
- D.46
44.
Sickle cell anaemia affects the shape and oxygen-carrying ability of:
- A.Bone cells
- B.Red blood cells
- C.Nerve cells
- D.Skin cells
45.
Which of these can cause mutations?
- A.Radiation (X-rays, UV)
- B.Certain chemicals
- C.Copying mistakes in DNA
- D.All of these
Answer Key
Section A — Multiple Choice (1 mark each)
- (B) Cell division
- (D) Breathing
- (B) Increasing the number of cells
- (B) Repair
- (A) Reproduction
- (B) Cell cycle
- (B) Interphase
- (B) S
- (B) Cytokinesis
- (A) Cancer
- (B) Genetically identical to the parent
- (B) Prophase, metaphase, anaphase, telophase
- (B) Metaphase
- (C) Anaphase
- (B) Growth and repair
- (B) Gametes (sex cells)
- (B) Four
- (B) Haploid
- (B) 23
- (B) Crossing over
- (B) DNA (with proteins)
- (B) Double helix
- (B) Gene
- (B) 46
- (B) 23 pairs
- (B) Heredity
- (B) Gregor Mendel
- (B) Garden pea plants
- (B) All tall
- (B) Segregation
- (B) Dominant
- (B) Genotype
- (C) tt
- (B) Homozygous
- (B) T is dominant over t
- (B) XX
- (B) XY
- (B) Father's sperm
- (B) Colour blindness
- (B) Does not clot properly
- (A) Mutation
- (B) Gene mutation
- (B) 21
- (B) Red blood cells
- (D) All of these
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