CBSE Class 12 Biology Term 1 MCQs
Q1: The outermost and innermost wall layers of microsporangium in an anther are respectively.
(a) Endothecium and tapetum
(b) Epidermis and endodermis
(c) Epidermis and middle layer
(d) Epidermis and tapetum
Q2: Which of the following fruit is a case of parthenogenesis?
(a) Fruit without seeds after pollination
(b) Fruit with seeds after pollination
(c) Fruit with viable seeds without fertilization
(d) Fruit with viable seeds after fertilization.
Q3: Entry of pollen tube through micropyle is called
(a) Mesogamy
(b) Pseudogamy
(c) Chalazogamy
(d) Porogamy
Q4: 'Corn cobs have long tassels'. This is because
(a) they are useful in protecting the pollen grains from wetting
(b) they can easily attract insects
(c) they can easily trap the air-borne pollen grains
(d) it helps them to reach the surface of the water which helps them to get pollinated by insects
Q5: The Leydig cells are a source of
(a) fructose
(b) androgens
(c) progesterone
(d) mucus
Q6: Oestrogen is more active during
(a) ovulatory phase
(b) secretory phase
(c) menstrual phase
(d) post-menstrual phase
Q7: Colostrum is important for newly born because
(a) it contains essential antigen
(b) it contains essential antibodies
(c) Both (a) and (b)
(d) it has more nutrients than ordinary milk
Q8: In oocyte secondary maturation occurs in
(a) ovary
(b) abdominal cavity
(c) Fallopian tube
(d) uterus
Q9: Which of the following is not a bacterial STD?
(a) Syphilis
(b) Gonorrhea
(c) Herpes genitalis
(d) Chlamydiasi
Q10: Intensely lactating mothers generally do not conceive due to the
(a) suppression of gonadotropins
(b) hypersecretion of gonadotropins
(c) suppression of gametic transport
(d) suppression of fertilisation
Q11: The method of directly injecting sperm into the ovum is assisted by reproductive technology is called
(a) GIFT
(b) ZIFT
(c) ICSI
(d) ET
Q12: Tubectomy is a method of sterilisation in which
(a) nucleus is removed
(b) ovaries are removed
(c) a small part of the fallopian tube is removed
(d) a small part of the vas deferens is removed
Q13: Distance between the genes and percentage of recombination shows
(a) a direct relationship
(b) an inverse relationship
(c) a parallel relationship
(d) no relationship
Q14: Downs syndrome is due to
(a) non-disjunction of chromosome
(b) sex-linked inheritance
(c) crossing over
(d) linkage
Q15: Who has given the concept of gene mapping?
(a) Thomas Hunt Morgan
(b) Gregor John Mendel
(c) Alfred Sturtevant
(d) Henking
Q16: Mendels Law of independent assortment holds good for genes situated on the
(a) nonhomologous chromosomes
(b) homologous chromosomes
(c) extranuclear genetic element
(d) same chromosome
Q17: What is not the genetic code?
(a) It is nearly universal.
(b) It is degenerate.
(c) It is unambiguous.
(d) A codon in mRNA is read in a noncontiguous fashion.
Q18: Discontinuous synthesis of DNA occurs on one strand because
(a) DNA molecule being synthesized is very long
(b) DNA dependent polymerase catalyses polymerisation only in one direction (5-3‘)
(c) It is a more efficient process
(d) DNA ligase has to have some role
Q19: Adenine pairs with thymine with
(a) 1 hydrogen bond
(b) 2 hydrogen bond
(c) 3 hydrogen bond
(d) 4 hydrogen bond
Q20: The protein of DNA, which contains information for an entire polypeptide is called as
(a) Cistron
(b) Muton
(c) Recon
(d) Operon
Answers:
1: (d) Epidermis and tapetum
2: (a) Fruit without seeds after pollination
3: (d) Porogamy
4: (c) they can easily trap the air-borne pollen grains
5: (b) androgens
6: (b) secretory phase
7: (b) it contains essential antibodies
8: (c) Fallopian tube
9: (c) Herpes genitalis
10: (a) suppression of gonadotropins
11: (c) ICSI
12: (d) small part of vas deferens is removed
13: (a) a direct relationship
14: (a) non-disjunction of chromosome
15: (a) Thomas Hunt Morgan
16: (b) homologous chromosomes
17: (d) A codon in mRNA is read in a noncontiguous fashion.
18: (b) DNA dependent polymerase catalyses polymerisation only in one direction (5-3‘)
19: (b) 2 hydrogen bond
20: (a) Cistron
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