Bihar Board 12th Biology Important Questions Objective Type Part 1 are the best resource for students which helps in revision.
Bihar Board 12th Biology Objective Important Questions Part 1
In following Questions. There are only one correct answer. You have to choose the correct answer.
Question 1.
A typical angiospermic embryo sac at maturity is eight nucleate and:
(a) Single celled
(b) Four celled
(c) Seven celled
(d) Eight celled
Answer:
(c) Seven celled
Question 2.
In animals, juvenile phase is followed by-
(a) Vegetative phase
(b) Senescent phase
(c) Reproductive phase
(d) Old age
Answer:
(b) Senescent phase
Question 3.
The number of chromosomes in the shoot tip cells of a pea plant is 14. The number of chromosomes in the microspore mother cells of same plant shall be
(a) 14
(b) 7
(c) 28
(d) 10
Answer:
(a) 14
Question 4.
Vegetative propagation in mint occurs by
(a) Rhizome
(b) Sucker
(c) Runner
(d) Offset
Answer:
(b) Sucker
Question 5.
In angiosperms, male gametes are formed by the division of:
(a) Microspore
(b) Vegetative cell
(c) Generative cell
(d) Microspore mother cell
Answer:
(a) Microspore
Question 6.
The pollen grains from another reach to stigma of another flower of same plant is called:
(a) Autogamy
(b) Xenogamy
(c) Geitonogamy
(d) Karyogamy
Answer:
(c) Geitonogamy
Question 7.
In following pollination which one is autogamous?
(a) Xenogamy
(b) Geitonogamy
(c) Chasmogamy
(d) Cleistogamy
Answer:
(d) Cleistogamy
Question 8.
Synergids are:
(a) Haploid
(b) Diploid
(c) Triploid
(d) Tetraploid
Answer:
(a) Haploid
Question 9.
Apomictic embryo is citrus arise from:
(a) Synergids
(b) Diploid egg
(c) Maternal sporophytic tissue
(d) Antipodal cells
Answer:
(c) Maternal sporophytic tissue
Question 10.
Oestrous cycle occurs in females of:
(a) Apes
(b) Humans
(c) Monkeys
(d) Cow
Answer:
(d) Cow
Question 11.
In followings which one is not a method of asexual reproduction?
(a) Budding
(b) Sowing
(c) Layering
(d) Binary fission
Answer:
(b) Sowing
Question 12.
No individual is immortal except:
(a) Single celled organisms
(b) Green plants
(c) Sponges
(d) Cyanobacteria
Answer:
(a) Single celled organisms
Question 13.
The offsprings those are exactly identical to one another as well as identical to their parents is known as:
(a) Twins
(b) Replicates
(c) Drones
(d) Clones
Answer:
(d) Clones
Question 14.
In angiosperms, functional megaspore develops into:
(a) Embryo sac
(b) Ovule
(c) Endosperm
(d) Pollen sac
Answer:
(a) Embryo sac
Question 15.
Tunica albuginea is the covering of:
(a) Liver
(b) Spleen
(c) Testes
(d) Ovary
Answer:
(c) Testes
Question 16.
Acrosome of a sperm is formed from:
(a) Lysosome
(b) Golgi body
(c) E.R.
(d) Nucleus
Answer:
(b) Golgi body
Question 17.
Testes are extra abdominal for:
(a) Spermatogenesis
(b) More spermatogenesis
(c) Less spermatogenesis
(d) All of the above
Answer:
(b) More spermatogenesis
Question 18.
Testes are attached to scrotum by:
(a) Ligaments
(b) Tendons
(c) Gubemaculum
(d) Cords
Answer:
(c) Gubemaculum
Question 19.
In epididymis:
(a) Sperms are nourished
(b) Sperms mature
(c) Sperms are stored
(d) All of the above
Answer:
(b) Sperms mature
Question 20.
The nutritive rolls found in seminiferous tubules are:
(a) Leydig cells
(b) Sertoli cells
(c) Spermatogonial cells
(d) Chromaffin cells
Answer:
(b) Sertoli cells
Question 21.
Sperm preparation before entry into the ovum is called:
(a) Maturation
(b) Insemination
(c) Capacitation
(d) Fertilization
Answer:
(c) Capacitation
Question 22.
Fertilizin is a chemical substance produced from:
(a) Acrosome
(b) Polar bodies
(c) Mature eggs
(d) Middle piece of sperms
Answer:
(c) Mature eggs
Question 23.
The hormone which inhibits the development of graffian follicles & ovulation is?
(a) FSH
(b) LH
(c) Progesterone
(d) Estrogen
Answer:
(c) Progesterone
Question 24.
Menstrual cycle is affected by:
(a) LH only
(b) FSH only
(c) Estrogen only
(d) FSH, LH & estrogen
Answer:
(d) FSH, LH & estrogen
Question 25.
from ovary which one releases?
(a) Primary Oocyte
(b) Secondary Oocyte
(c) Ovum
(d) Oogonium
Answer:
(b) Secondary Oocyte
Question 26.
In human beings placenta forms by:
(a) Chorion
(b) Amnion
(c) Allantois
(d) Allantois & utsine wall
Answer:
(a) Chorion
Question 27.
Antrum is the cavity of:
(a) Ovary
(b) Graffian follicle
(c) Blastula
(d) Gastrula
Answer:
(b) Graffian follicle
Question 28.
For the formation of hundred one men, how many meiotic divisions will be required?
(a) 202
(b) 101
(c) 126
(d) 127
Answer:
(d) 127
Question 29.
From 20 secondary spermatocytes how many sperms will form?
(a) 20
(b) 80
(c) 40
(d) 100
Answer:
(c) 40
Question 30.
From 100 Primary follicles how many ova will form?
(a) 100
(b) 200
(c) 300
(d) 400
Answer:
(a) 100
Question 31.
Corpus luteum and macula lutea both are:
(a) A source of hormone
(b) Found in human ovaries
(c) Characterized by a yellow colour
(d) Contributory in maintaining pregnancy
Answer:
(c) Characterized by a yellow colour
Question 32.
During which month of pregnancy movement of foetus & appearance of hairs on head observed?
(a) 3rd month
(b) 4th month
(c) 5th month
(d) 6th month
Answer:
(c) 5th month
Question 33.
The secreation of which gland nourishes the sperms?
(a) Prostate gland
(b) Seminal vesicle
(c) Bulbourethral gland
(d) Perineal gland
Answer:
(b) Seminal vesicle
Question 34.
The part of fallopian tube closest to ovary is:
(a) Isthmus
(b) Ampulla
(c) Infundibulum
(d) Cervix
Answer:
(c) Infundibulum
Question 35.
Parturition signal originates from:
(a) Fully developed foetus only
(b) Placenta only
(c) Placenta and fully developed foetus
(d) Oxytocin released from pituitary gland
Answer:
(c) Placenta and fully developed foetus
Question 36.
Polar bodies are formed during the production of:
(a) Spermatozoon
(b) Secondary Oocyte
(c) Ovum
(d) both (b) & (c)
Answer:
(d) both (b) & (c)
Question 37.
In females at the age of puberty menstruation starts. The start of menstruation is known as:
(a) Menarche
(b) Menopause
(c) Onset
(d) All of these
Answer:
(a) Menarche
Question 38.
LH is in high level during menstrual cycle is in:
(a) 7th day
(b) 14th day
(c) 20th day
(d) 28th day
Answer:
(b) 14th day
Question 39.
During embryonic development which embryonic layer first forms?
(a) Ectoderm
(b) Mesoderm
(c) Endoderm
(d) Ectoderm & Mesoderm both
Answer:
(c) Endoderm
Question 40.
In human beings placenta forms by:
(a) Amnion
(b) Chorion
(c) Allantois
(d) chorion & allantois
Answer:
(b) Chorion
Question 41.
Which of the following hormones is not secreted by human placenta?
(a) hcg
(b) Estrogen
(c) Progesteron
(d) LH
Answer:
(d) LH
Question 42.
Progesterone in the contraceptive pill:
(a) Prevents ovulation
(b) Inhibits estrogen
(c) Checks implantation
(d) All of the above
Answer:
(a) Prevents ovulation
Question 43.
Copper-T prevents:
(a) Ovulation
(b) Fertilization of egg
(c) Implantation of zygote Mendel worked on:
(d) both (b) & (c)
Answer:
(d) both (b) & (c)
Question 44.
Mendel worked on:
(a) Edible Pea
(b) Wild Pea
(c) Garden Pea
(d) All of these
Answer:
(c) Garden Pea
Question 45.
Mendel’s laws were rediscovered by:
(a) Correns
(b) Tshermark
(c) Hugo de Vries
(d) All of these
Answer:
(d) All of these
Question 46.
Genes located on Y-chromosome are:
(a) Autosomal genes
(b) Sex-linked genes
(c) Holandric genes
(d) Mutant genes
Answer:
(c) Holandric genes
Question 47.
In Mirabilis jalapa red (RR) flower is crossed with white (WW) flower. Offspring produced pink (RW). This one is a case of:
(a) Dominant recessive
(b) Incomplete dominance
(c) Hybrid
(d) Supplementary genes
Answer:
(b) Incomplete dominance
Question 48.
Who is the father of genetics?
(a) Devries
(b) Darwin
(c) Mendel
(d) Morgan
Answer:
(c) Mendel
Question 49.
The contrasting pairs of factors in Mendelian crosses are called:
(a) Alloy
(b) Multiple alleles
(c) Allelomorphs
(d) Paramorphs
Answer:
(c) Allelomorphs
Question 50.
In sickle cell anaemia which amino acid is substituted:
(a) Glutamic acid by valine in B-chain
(b) Valine by glutamic acid in α-chain
(c) glutamic acid by valine in α-chain
(d) Valine by glutamic acid in β-chain
Answer:
(a) Glutamic acid by valine in B-chain