biology MCQs - 12th class Chapter 04 Mcqs

1

Asexual reproduction requires how many parental organisms?

A

One

B

Two

C

Three

D

Four

2

The development of an egg without fertilization is known as?

A

Cloning

B

Parthenogenesis

C

Budding

D

Sporulation

3

Which process leads to the formation of gametes in sexual reproduction?

A

Mitosis

B

Meiosis

C

Fission

D

Cloning

4

In plants, the diploid generation is called the?

A

Gametophyte

B

Sporophyte

C

Thallus

D

Archegonium

5

The evolution of which structure was an important step for land adaptation in spermatophytes?

A

Pollen tube

B

Root system

C

Leaf cuticle

D

Flower petals

6

Fruit development without fertilization is called?

A

Parthenogenesis

B

Parthenocarpy

C

Apomixis

D

Dormancy

7

Which of the following is an example of a fruit that can develop through parthenocarpy?

A

Apple

B

Banana

C

Peach

D

Plum

8

The special condition of rest that enables an embryo to survive unfavourable conditions is called?

A

Germination

B

Hibernation

C

Seed Dormancy

D

Vernalisation

9

A burst of respiratory activity that accompanies fruit ripening is called?

A

Climacteric

B

Photoperiodism

C

Abscission

D

Guttation

10

The effect of photoperiodism was first studied in 1920 by?

A

Watson and Crick

B

Mendel

C

Garner and Allard

D

Darwin

11

Plants that require long days for flowering are known as?

A

Short-day plants

B

Long-day plants

C

Day-neutral plants

D

Night-flowering plants

12

Which of the following is an example of a short-day plant?

A

Henbane

B

Cocklebur

C

Cucumber

D

Spring wheat

13

The pigment responsible for detecting light quality and duration in plants is?

A

Chlorophyll

B

Carotenoid

C

Phytochrome

D

Anthocyanin

14

The active form of phytochrome, P730, absorbs which type of light?

A

Red light

B

Blue light

C

Green light

D

Far-red light

15

The conversion of P730 to P660 in phytochromes occurs during the?

A

Day

B

Dark/Night

C

Morning

D

Evening

16

The induction of flowering by exposure to low temperature is called?

A

Photoperiodism

B

Vernalisation

C

Dormancy

D

Germination

17

An effective temperature for vernalisation is around?

A

25°C

B

15°C

C

4°C

D

0°C

18

In honeybees, males (drones) develop from?

A

Fertilized eggs

B

Unfertilized eggs

C

Diploid eggs

D

Worker eggs

19

Organisms produced from a single cell by subculturing are called?

A

Gametes

B

Zygotes

C

Clones

D

Twins

20

Twins that develop from a single zygote splitting are called?

A

Fraternal twins

B

Identical twins

C

Siamese twins

D

Dizygotic twins

21

Animals that lay shelled eggs for external development after internal fertilization are called?

A

Viviparous

B

Oviparous

C

Ovoviviparous

D

Parthenogenic

22

Animals that give birth to live young after internal development are known as?

A

Viviparous

B

Oviparous

C

Ovoviviparous

D

Hermaphrodites

23

The male reproductive system in humans consists of a pair of?

A

Ovaries

B

Testes

C

Kidneys

D

Lungs

24

Sperms are produced in which structures within the testes?

A

Vas deferens

B

Epididymis

C

Seminiferous tubules

D

Sertoli cells

25

Which cells provide nourishment to developing sperms in the tubules?

A

Germinal cells

B

Interstitial cells

C

Sertoli cells

D

Spermatogonia

26

The hormone responsible for male secondary sexual characteristics is?

A

Estrogen

B

Progesterone

C

Testosterone

D

LH

27

In human females, the release of an ovum from the ovary is called?

A

Menstruation

B

Gestation

C

Ovulation

D

Fertilization

28

Where does fertilization of the ovum typically occur in humans?

A

Uterus

B

Vagina

C

Ovary

D

Proximal part of the oviduct

29

The periodic reproductive cycle in human females is called the?

A

Oestrous cycle

B

Menstrual cycle

C

Lunar cycle

D

Ovarian cycle

30

The average length of the human menstrual cycle is approximately?

A

14 days

B

21 days

C

28 days

D

35 days

31

Which pituitary hormone stimulates the development of primary follicles?

A

LH

B

FSH

C

Oxytocin

D

Progesterone

32

The yellowish glandular structure formed from follicle cells after ovulation is the?

A

Corpus albicans

B

Corpus luteum

C

Endometrium

D

Placenta

33

Which hormone is secreted by the corpus luteum to prepare the uterus for implantation?

A

Estrogen

B

FSH

C

Progesterone

D

Oxytocin

34

The cessation of the menstrual cycle in females is called?

A

Menarche

B

Menopause

C

Ovulation

D

Atresia

35

The total gestation period in humans is usually about?

A

200 days

B

240 days

C

280 days

D

320 days

36

From the beginning of the 3rd month of pregnancy, the embryo is referred to as the?

A

Zygote

B

Blastocyst

C

Fetus

D

Infant

37

Which hormone induces labour pains by causing uterine contractions?

A

Progesterone

B

Estrogen

C

LTH

D

Oxytocin

38

The structure that facilitates the exchange of nutrients and waste between mother and fetus is the?

A

Amnion

B

Chorion

C

Placenta

D

Uterus wall

39

Fertilizing an ovum outside the female body is a technique known as?

A

Cloning

B

Parthenogenesis

C

In vitro fertilization

D

Artificial insemination

40

Gonorrhea is caused by which type of microorganism?

A

Virus

B

Fungus

C

Spirochaete

D

Bacterium

41

The causative agent of Syphilis is?

A

Neisseria gonorrhoeae

B

Herpes simplex virus

C

Treponema pallidum

D

HIV

42

Genital Herpes is caused by a?

A

Bacterium

B

Fungus

C

Virus

D

Protozoan

43

The union of gametes is called?

A

Meiosis

B

Fertilization

C

Gametogenesis

D

Cleavage

44

In the alternation of generations in plants, meiosis occurs during?

A

Gametogenesis

B

Sporogenesis

C

Fertilization

D

Zygote formation

45

A diploid cell of the ovule developing into an embryo without a male gamete is called?

A

Parthenocarpy

B

Apomixis

C

Cloning

D

Budding

46

Which hormone is artificially added to tomatoes to induce parthenocarpy?

A

Gibberellin

B

Cytokinin

C

Auxin

D

Ethylene

47

In the Bryophyte life cycle, the sporophyte is dependent on the?

A

Gametophyte

B

Soil

C

Water

D

Rhizoids

48

The process where a nucleus from a somatic cell is transplanted into an enucleated egg cell is central to?

A

Tissue culture

B

Cloning

C

Parthenogenesis

D

Identical twinning

49

The reproductive cycle found in all female mammals except humans is the?

A

Menstrual cycle

B

Lunar cycle

C

Oestrous cycle

D

Gestation cycle

50

The average loss of blood after birth is about?

A

150 cm³

B

250 cm³

C

350 cm³

D

450 cm³