Class 12 Biology Chapter 4 MCQ. We covered all the Class 12 Biology Chapter 4 MCQ in this post for free so that you can practice well for the exam.
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Class 12 Biology Chapter 4 MCQ for Students
An embryo with 8-16 blastomeres is called
(A) blastocyst
(B) morula
(C) trophoblast
(D) inner cell mass
Option b – morula
Ovulation occurs ( Class 12 Biology MCQ )
(A) after follicular phase
(B) after the secretory phase
(C) before the proliferative phase
(D) after luteal phase
Option a – after follicular phase
Secretions from which of the following gland(s) constitute seminal plasma?
(A) Bulbourethral gland
(B) Seminal vesicle
(C) Prostrate gland
(D) All of the above
Option d – All of the above
The part of the oviduct that has a narrow lumen and joins the uterus is ( Class 12 Biology MCQ )
(A) ampulla
(B) infundibulum
(C) fimbriae
(D) Isthmus
Option d – Isthmus
Spermatogonia differentiate into primary spermatocytes
(A) during fetal life
(B) at birth
(C) at puberty
(D) during childhood
Option c – at puberty
Which of the following method blocks male gamete transport and prevents conception? ( Class 12 Biology MCQ )
(A) Tubectomy
(B) IUDS
(C) Contraceptive pills
(D) Vasectomy
Option d – Vasectomy
Complete the given analogy with respect to phases of the menstrual cycle. to 1st to 5th Day : Menstrual Phase :: 5th to to 13th 13th Day : ………..
(A) Ovulatory phase
(B) Proliferative phase
(C) Luteal phase
(D) Secretory phase
Option b – Proliferative phase
……… are fleshy folds of tissue surrounding the vaginal opening. ( Class 12 Biology MCQ )
(A) Clitoris
(B) Mons pubis
(C) Labia majora
(D) Vaginal orifice
Option c – Labia majora
The cap-like structure of the sperm filled with enzymes that help in fertilization is called
(A) antrum
(B) ampulla
(C) acrosome
(D) middle piece
Option c – acrosome
Milk is sucked out of the mammary gland through the ( Class 12 Biology MCQ )
(A) mammary lobe
(B) lactiferous duct
(C) mammary ampulla
(D) mammary duct
Option b – lactiferous duct
The sex of the baby is decided at which of the following stages?
(A) Implantation
(B) Fertilisation
(C) Cleavage
(D) Blastocyst stage
Option b – Fertilisation
The corpus luteum secretes large amounts of progesterone during ( Class 12 Biology MCQ )
(A) follicular phase
(B) menstrual phase
(C) ovulatory phase
(D) luteal phase
Option d – luteal phase
The sperm head comes in contact with …….. of the ovum during fertilization.
(A) corona radiate
(B) perivitelline space
(C) zona pellucida
(D) plasma membrane
Option c – zona pellucida
Identify the hormones produced by the placenta and select the correct option. i. Estrogen ii. hCG iii. hPL iv. Progesterone ( Class 12 Biology MCQ )
(A) i and iv
(B) ii and iii
(C) i, ii and iv
(D) i, ii, iii and iv
Option d – i, ii, iii and iv
Foetus limbs and digits develop
(A) in the first month of pregnancy
(B) by the end of the first trimester
(C) by the end of the second month of pregnancy
(D) by the end of the second trimester
Option c – by the end of the second month of pregnancy
During the method of periodic abstinence, couples abstain from coitus between which days of the menstrual cycle. ( Class 12 Biology MCQ )
(A) 1-5
(B) 10-17
(C) 18-28
(D) 5-10
Option b – 10-17
Which of the following is TRUE for a vasectomy?
(A) A small part of the vas deferens is removed /tied.
(B) A small part of the fallopian tube is removed.
(C) A small portion of the vasa efferentia is tied through an incision on the scrotum.
(D) Cervix is made hostile to sperm.
Option a – A small part of the vas deferens is removed /tied
Identify which of the following statements are TRUE with respect to lactational amenorrhea and choose the correct option. i. Chances of conception are high during this period. ii. Ovulation does not occur during this period. iii. It is characterized by the onset of menstruation. iv. The method is effective to prevent pregnancy for up to six months following parturition.
(A) ii and iv
(B) i, ii and iii
(C) i, ii and iv
(D) i and iii
Option a – ii and iv
Which of the following statements is INCORRECT with respect to oral contraceptive pills? ( Class 12 Biology MCQ )
(A) They are generally taken for a period of 21 days followed by a gap of 7 days.
(B) They prevent ovulation and implantation.
(C) They may alter the quality of cervical mucus to retard the entry of sperms.
(D) They increase the phagocytosis of sperm within the uterus.
Option d – They increase the phagocytosis of sperm within the uterus.
In the case of males having low sperm count, which of the following technique would be useful for fertilization?
(A) Intra uterine transfer
(B) Gamete Intra cytoplasmic fallopian transfer
(C) In vitro fertilization
(D) Artificial insemination
Option d – Artificial insemination
Which hormone level reaches a peak during the luteal phase of the menstrual cycle? ( Class 12 Biology MCQ )
(A) Follicle-stimulating hormone
(B) Progesterone
(C) Luteinising hormone
(D) Oxytocin
Option b – Progesterone
Which of the following is NOT a male sex accessory duct?
(A) Rete testis
(B) Vasa efferentia
(C) Vas deferens
(D) Seminal vesicles
Option d – Seminal vesicles
………. is not a part of the fallopian tube. ( Class 12 Biology MCQ )
(A) Cervix
(B) Ampulla
(C) Isthmus
(D) Infundibulum
Option a – Cervix
Which of the following statement is INCORRECT?
(A) HCI provides the alkaline pH optimal for pepsins.
(B) About 30% of the starch is hydrolyzed by salivary amylase.
(C) Intrinsic factor is essential for the absorption of vitamin B12.
(D) Chyme is partly digested food that moves from the stomach to the small intestine.
Option a – HCI provides the alkaline pH optimal for pepsins
Read the following statements and select the correct option. Statement I: Break down of biomacromolecules occurs in the duodenum region of the small intestine. Statement II: The simple substances formed after digestion are absorbed in the jejunum and ileum regions of the large intestine.
(A) Statement I is correct and II is incorrect.
(B) Statement I is incorrect and II is correct.
(C) Both Statements I and II are correct.
(D) Both Statements I and II are incorrect.
Option a – Statement I is correct and II is incorrect.
The hormone produced by the atria of the heart which is involved in the regulation of kidney function is
(A) Aldosterone
(B) Angiotensin
(C) Renin
(D) Atrial Natriuretic Factor
Option d – Atrial Natriuretic Factor
Before defaecation, the faecal matter is temporarily stored in
(A) ileum
(B) caecum
(C) jejunum
(D) rectum
Option d – rectum
The hairpin-shaped part next to the proximal convoluted tubule is
(A) Renal corpuscle
(B) Collecting duct
(C) Distal convoluted tubule
(D) Henle’s loop
Option d – Henle’s loop
The physiological value of fats is
(A) 2.5 kcal/gm
(B) 4.1 kcal/gm
(C) 5.65 kcal/gm
(D) 9.0 kcal/gm
Option d – 9.0 kcal/gm
Read the following statements and select the correct option. i. Gastro-oesophageal sphincter regulates the opening of oesophagus into the stomach. ii. The descending colon opens into the duodenum. iii. The stomach is located in the upper right portion of the abdominal cavity. iv. The caecum is a small blind sac that hosts some symbiotic microorganisms.
(A) Statements i and iii are incorrect
(B) Statements ii and iii are correct
(C) Statements i and iv are correct
(D) Statements ii and iv are incorrect
Option c – Statements i and iv are correct
Read the statements given below and select the correct option. Statement I: PCT helps in maintaining the pH and ionic balance of the body fluids. Statement II: Conditional reabsorption of Na and water takes place in DCT.
(A) Statement I is correct and II is incorrect.
(B) Statement I is incorrect and II is correct.
(C) Both Statements I and II are correct.
(D) Both Statements I and II are incorrect.
Option c – Both Statements I and II are correct.
In an electrocardiogram, the QRS complex represents
(A) atrial depolarization
(B) ventricular depolarization
(C) ventricular repolarization
(D) relaxation of ventricles
Option b – ventricular depolarization
The proenzyme pepsinogen and mucous are secreted by ………. of gastric glands. respectively
(A) peptic cells and mucus neck cells
(B) oxyntic cells and peptic cells
(C) mucus neck cells and parietal cells
(D) parietal cells and chief cells
Option a – peptic cells and mucus neck cells
A fall in GFR activates JG cells to release
(A) pepsin
(B) trypsin
(C) renin
(D) enterokinase
Option c – renin
Read the following statements and select the correct option. Statement I: Thrombin converts fibrinogen into fibrin. Statement II: Thrombokinase converts prothrombin into active thrombin.
(A) Statement I is correct and II is incorrect.
(B) Statement I is incorrect and II is correct.
(C) Both Statements I and II are correct.
(D) Both Statements I and II are incorrect.
Option c – Both Statements I and II are correct.
Select the INCORRECT statement from the following.
(A) Maltase converts maltose into glucose and fructose
(B) Lactase converts lactose into glucose and galactose
(C) Sucrase converts sucrose into glucose and
(D) fructose Nucleosidases convert nucleosides into sugars and bases
Option a – Maltase converts maltose into glucose and fructose
The proximal convoluted tubule is lined by ……… brush border epithelium, which increases the surface area for reabsorption.
(A) simple cuboidal
(B) compound ciliated
(C) simple glandular
(D) compound columnar
Option a – simple cuboidal
A closed circulatory system is found in
(A) crabs
(B) octopus
(C) cockroach
(D) earthworms
Option d – earthworms
Structure ‘X’ is a digestive gland. It is both an endocrine and an exocrine gland. It is situated in the limbs of the ‘C’ shaped duodenum. Identify the structure ‘X’ and select the correct option.
(A) Pancreas
(B) Small intestine
(C) Liver
(D) Stomach
Option a – Pancreas
Urine is stored in ……… till a voluntary signal from CNS is given for its release.
(A) ureter
(B) urinary bladder
(C) urethra
(D) renal corpuscle
Option b – urinary bladder
Read the following statements and select the correct option. Statement I: Small amounts of lipases are secreted by gastric glands. Statement II: Gastric glands are located in the mucosa of the stomach.
(A) Statement I is correct and II is incorrect.
(B) Statement I is incorrect and II is correct.
(C) Both Statements I and II are correct.
(D) Both Statements I and II are incorrect.
Option c – Both Statements I and II are correct.
Pick out the INCORRECT statement.
(A) An adult human excretes 1.5 liters of urine on average per day.
(B) Around 50% of the filtrate is reabsorbed by the renal tubules.
(C) 70-80% of the electrolytes and water are reabsorbed in the proximal convoluted tubule.
(D) The glomerular filtration rate in a healthy individual is 180 liters per day.
Option d – The glomerular filtration rate in a healthy individual is 180 liters per day.
The course of blood flow in the systemic circulation is
(A) left ventricle to the right atrium through the aorta
(B) right ventricle to left auricle through the aortic arch
(C) left atrium to the right atrium through the vena cava
(D) right ventricle to left ventricle through vena cava
Option a – left ventricle to the right atrium through the aorta
Which of the following is TRUE with respect to Marasmus? ( Practice Questions for NEET Biology )
(A) It is commonly found in adolescents.
(B) In this skin becomes dry, thin, and wrinkled.
(C) It is caused due to deficiency of vitamins in the diet.
(D) It shows an abnormal increase in growth rate and body weight.
Option b – In this skin becomes dry, thin, and wrinkled.
Which of the following cells are arranged in an intricate manner in Bowman’s capsule to form filtration slits?
(A) Megakaryocytes
(B) Podocytes
(C) Oxyntic cells
(D) Goblet cells
Option b – Podocytes
Enzymes are diverse from inorganic catalysts as they
(A) have a high diffusion rate
(B) work at high temperatures
(C) are being used up in reactions
(D) are proteinaceous in nature
Option d – are proteinaceous in nature
Which of the following is NOT an example of prokaryotes?
(A) Pleuro pneumonia-like organisms
(B) Mycoplasma
(C) Protists.
(D) Both (A) and (B)
Option c – Protists.
Alary muscles are associated with ……….. system of cockroach.
(A) Digestive
(B) Circulatory
(C) Respiratory
(D) Excretory
Option b – Circulatory
During an enzymatic reaction, the transition state structure of the substrate formed is
(A) permanent and stable
(B) permanent but unstable
(C) transient but stable
(D) transient and unstable
Option d – transient and unstable
The middle lamella which holds the neighboring plant cells together is mainly composed of
(A) suberin
(B) calcium pectate
(C) cellulose
(D) lignin
Option b – calcium pectate
Watson and Crick described the salient features of ……
(A) Z-DNA
(B) B-DNA
(C) A-DNA
(D) D-DNA
Option b – B-DNA
Identify the function of centrioles.
(A) Formation of spindle fibers
(B) Formation of the nucleolus
(C) Initiation of cell division
(D) Formation of cell plate
Option a – Formation of spindle fibers
All the given below are associated with the excretory system of cockroaches, except
(A) Maxillary palps
(B) Urecose glands
(C) Nephrocytes
(D) Malpighian tubules.
Option a – Maxillary palps
…….. are glycerides of fatty acid with low melting points.
(A) Trihydroxy propane
(B) Trichloroacetic acids
(C) Nucleic acids
(D) Oils
Option d – Oils
…….. is an exchange of chromosomal segments between maternal and paternal chromatids during meiosis.
(A) Linkage
(B) DNA multiplication
(C) Crossing over
(D) Dominance
Option c – Crossing over
In cockroaches, during respiration, the exchange of gases takes place at the …….. by diffusion.
(A) Tracheoles
(B) Ganglia
(C) Ommatidia
(D) Maxillary palps
Option a – Tracheoles
How does an enzyme act on a substrate?
(A) By increasing the pH
(B) By decreasing the pH
(C) By increasing the energy of activation
(D) By reducing the energy of activation
Option d – By reducing the energy of activation
Identify the phase of gamete formation which requires the presence of the enzyme recombinase.
(A) Pachytene
(B) Leptotene
(C) Diplotene
(D) Zygotene
Option a – Pachytene
From the following which is NOT a feature of enzymes?
(A) They speed up the rate of biochemical reactions.
(B) They are proteinaceous in nature.
(C) They are used up in reactions.
(D) They are specific in nature.
Option c – They are used up in reactions.
Identify the role of the Golgi complex.
(A) Trapping the light and transforming it into chemical energy
(B) Digesting proteins and carbohydrates
(C) Energy-transferring organelles
(D) Post-translational modification of proteins and glycoxidation of lipids
Option d – Post-translational modification of proteins and glycoxidation of lipids
Identify the type of enzyme involved in the following reaction. S-G+S’→S + S’-G
(A) Hydrolase
(B) Polymerase
(C) Transferase
(D) Lyase
Option c – Transferase
In the synthesis phase of the cell cycle.
(A) amount of DNA doubles in each cell.
(B) amount of DNA is reduced to half in each cell.
(C) amount of DNA remains the same in each cell.
(D) chromosome number is increased.
Option a – amount of DNA doubles in each cell.
Which of the following is regarded as a unit of nervous tissue?
(A) Myelin sheath
(B) Neuroglia
(C) Axons
(D) Neurons
Option d – Neurons
Identify the enzyme that catalyzes inter-conversion of optical, geometrical, or positional isomers.
(A) Lyases
(B) Isomerases
(C) Hydrolases
(D) Ligases
Option b – Isomerases
Which phase of the cell cycle occupies the maximum part?
(A) Cytokinesis
(B) Meiotic phase
(C) Interphase
(D) Mitotic phase
Option c – Interphase
A glycosidic bond exists between …….. in the DNA molecule.
(A) Any two nitrogen bases
(B) Purines and pyrimidines
(C) Sugar and a nitrogen base
(D) Sugar and phosphate
Option c – Sugar and a nitrogen base
During which phase the duplication of the centriole occurs in the cytoplasm?
(A) ‘S’ phase
(B) Telophase
(C) Metaphase
(D) Prophase
Option a – ‘S’ phase
For which of the following purpose hepatic caeca is useful in cockroaches?
(A) Respiration
(B) Excretion
(C) Secretion of digestive juice
(D) Sensation
Option c – Secretion of digestive juice
Inulin is a type of ……… found in plant cells.
(A) vitamin
(B) polysaccharide
(C) protein
(D) lipid
Option b – polysaccharide
Identify a stage in which a chromosome is minimum coiled.
(A) Interphase
(B) Anaphase
(C) Metaphase
(D) Prophase
Option a – Interphase
We covered all the class 12 biology chapter 4 MCQ above in this post for free so that you can practice well for the exam.
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