biology MCQs - 9th class Chapter 04 Mcqs

1

The regular series of events a cell follows during its life is called the?

A

Cellular Process

B

Cell Cycle

C

Life Stage

D

Growth Phase

2

Which phase is NOT part of the interphase?

A

G1 Phase

B

S Phase

C

G2 Phase

D

M Phase

3

During which phase of the cell cycle is the DNA of each chromosome replicated?

A

G1 Phase

B

S Phase

C

G2 Phase

D

M Phase

4

What is the name for the division of the nucleus during mitosis?

A

Cytokinesis

B

Karyokinesis

C

Interphase

D

Telophase

5

In which stage of mitosis do the chromosomes align at the equator of the cell?

A

Prophase

B

Metaphase

C

Anaphase

D

Telophase

6

The network of microtubules that forms during prophase is called?

A

Spindle Fibres

B

Chromatin Network

C

Nuclear Matrix

D

Cytoskeleton

7

What structure is formed in plant cells during cytokinesis to divide the cytoplasm?

A

Cleavage Furrow

B

Cell Ring

C

Phragmoplast

D

Microtubule Ring

8

Mitosis is crucial for which of the following processes?

A

Sexual Reproduction

B

Gamete Formation

C

Growth and Repair

D

Genetic Variation

9

Uncontrolled cell division can lead to the formation of?

A

Cysts

B

Organs

C

Tumors

D

Tissues

10

In meiosis, a diploid parent cell produces how many haploid daughter cells?

A

Two

B

Four

C

Six

D

Eight

11

The process where homologous chromosomes pair up during prophase-I is called?

A

Synapsis

B

Crossing Over

C

Disjunction

D

Replication

12

The exchange of chromosome portions between non-sister chromatids is known as?

A

Synapsis

B

Disjunction

C

Recombination

D

Crossing Over

13

During which phase of meiosis do homologous chromosomes separate?

A

Anaphase-I

B

Anaphase-II

C

Metaphase-I

D

Telophase-I

14

After meiosis-I, each daughter cell has?

A

The same number of chromosomes as the parent

B

Twice the number of chromosomes

C

Half the number of chromosomes

D

No chromosomes

15

Which of the following processes occurs in meiosis but not in mitosis?

A

DNA Replication

B

Spindle Formation

C

Crossing Over

D

Cytokinesis

16

If a parent cell has 10 chromosomes, how many chromosomes will each daughter cell have after mitosis?

A

5

B

10

C

20

D

15

17

What is the primary significance of meiosis?

A

Growth of the organism

B

Repair of tissues

C

Asexual reproduction

D

Production of gametes

18

A cell that exits the cell cycle and stops dividing enters which phase?

A

G1 Phase

B

S Phase

C

G0 Phase

D

G2 Phase

19

During anaphase of mitosis, what separates and moves to opposite poles?

A

Homologous chromosomes

B

Sister chromatids

C

Centromeres

D

Spindle fibres

20

What is the role of kinetochore proteins?

A

They form the spindle fibres

B

They attach spindle fibres to the centromere

C

They condense the chromatin

D

They break down the nuclear envelope

21

In animal cells, cytokinesis begins with the formation of a?

A

Cell plate

B

Phragmoplast

C

Cleavage furrow

D

Vesicle wall

22

Which type of cells in the human body are constantly replaced by mitosis?

A

Nerve cells

B

Muscle cells

C

Red blood cells

D

Gamete cells

23

The process where a part of an organism grows back, like a starfish arm, is called?

A

Budding

B

Asexual Reproduction

C

Regeneration

D

Cloning

24

What are malignant tumors that invade other tissues also known as?

A

Benign tumors

B

Metastasis

C

Cancer

D

Cell masses

25

The German biologist who discovered the events of mitosis was?

A

Oscar Hertwig

B

Gregor Mendel

C

Walther Flemming

D

Robert Hooke

26

In meiosis-I, a pair of homologous chromosomes is referred to as a?

A

Bivalent

B

Tetrad

C

Dyad

D

Monad

27

What is the outcome of non-disjunction during meiosis?

A

Genetically identical gametes

B

Gametes with abnormal chromosome numbers

C

Faster cell division

D

Normal zygote formation

28

In flowering plants, meiosis produces what?

A

Gametes

B

Spores

C

Zygotes

D

Seeds

29

The M phase of the cell cycle consists of?

A

Karyokinesis only

B

Cytokinesis only

C

Karyokinesis and Cytokinesis

D

Interphase and Cytokinesis

30

In the G1 phase, the cell grows and synthesizes?

A

DNA

B

Chromosomes

C

Spindle fibres

D

Proteins and organelles

31

How long does the interphase typically last in the cell cycle?

A

About 50% of the time

B

About 75% of the time

C

About 90% of the time

D

About 25% of the time

32

During telophase of mitosis, what reforms around the sets of chromosomes?

A

Spindle fibres

B

Cell membrane

C

Nuclear envelope

D

Metaphase plate

33

Hydra reproduces asexually by which process involving mitosis?

A

Fragmentation

B

Fission

C

Budding

D

Spore formation

34

The point where non-sister chromatids form an X-shaped structure for crossing over is called?

A

Centromere

B

Kinetochore

C

Chiasma

D

Synapse

35

In anaphase-II of meiosis, what gets pulled apart to opposite poles?

A

Homologous chromosomes

B

Tetrads

C

Sister chromatids

D

Non-sister chromatids

36

Which cells in the human body may remain in the G0 phase for indefinite periods?

A

Epithelial cells

B

Liver cells

C

Neurons

D

Skin cells

37

Binary fission is a type of cell division found in?

A

Eukaryotes

B

Plants

C

Animals

D

Prokaryotes

38

In plant cells, which organelle produces vesicles that form the phragmoplast?

A

Ribosomes

B

Mitochondria

C

Golgi apparatus

D

Endoplasmic reticulum

39

What is restored in the zygote during sexual reproduction?

A

The haploid number of chromosomes

B

The original diploid number of chromosomes

C

Genetic variation

D

The number of gametes

40

Errors in mitosis can lead to a daughter cell receiving?

A

Both sister chromosomes

B

No chromosomes

C

A damaged chromosome

D

All of the above

41

Meiosis contributes to genetic diversity through?

A

Asexual reproduction

B

Crossing over and random assortment

C

Cell replacement

D

Binary fission

42

During metaphase-I, what aligns at the cell's equator?

A

Single chromosomes

B

Sister chromatids

C

Tetrads (homologous pairs)

D

Centrosomes

43

Which of these is a key difference between mitosis and meiosis?

A

Meiosis involves one division, mitosis involves two

B

Mitosis produces haploid cells, meiosis produces diploid cells

C

Homologous chromosomes pair up in meiosis but not in mitosis

D

Mitosis creates genetic variation, meiosis does not

44

In which phase does the cell check for DNA damage after replication and make repairs?

A

G1 Phase

B

S Phase

C

G2 Phase

D

M Phase

45

What happens to the nucleolus during prophase of mitosis?

A

It becomes larger

B

It duplicates

C

It breaks down

D

It moves to the poles

46

What is the term for the spreading of malignant tumors to other parts of the body?

A

Metastasis

B

Benign growth

C

Invasion

D

Disjunction

47

The final result of meiosis and cytokinesis is?

A

Two diploid cells

B

Two haploid cells

C

Four diploid cells

D

Four haploid cells

48

Sister chromatids are attached to each other at a point called the?

A

Kinetochore

B

Centrosome

C

Centromere

D

Chiasma

49

The division of cytoplasm is known as?

A

Karyokinesis

B

Cytokinesis

C

Interkinesis

D

Apoptosis

50

Which event happens during telophase-I of meiosis?

A

Chromosomes condense

B

Spindle fibres form

C

Homologous chromosomes separate

D

A new nuclear envelope forms around each haploid set