Description : In grasses what happens in microspore mother cell for the formation of mature pollen grains? (a) One meiotic and two mitotic divisions (b) One meiotic and one mitotic divisions (c) One meiotic division (d) One mitotic division
Last Answer : (b) One meiotic and one mitotic divisions
Description : Number of meiotic divisions required to produce 200/400 seeds of pea would be (a) 200/400 (b) 400/800 (c) 300/600 (d) 250/500
Last Answer : (d) 250/500.
Description : Total number of meiotic divisions required for forming 100 zygotes/100 grains of wheat is (a) 100 (b) 75 (c) 125 (d) 50
Last Answer : (c) 125
Description : 1. How many meiotic divisions are required to produce 200 microspores from functional microspore mother cell ? a) 400 b) 50 c) 200 d) 100
Last Answer : b) 50
Description : In humans, at the end of the first meiotic division, the male germ cells differentiate into the
Last Answer : In humans, at the end of the first meiotic division, the male germ cells ... Spermatozonia C. Primary spermatocytes D. Secondary spermatocytes
Description : n humans, at the end of the first meiotic division, the male germ cells differentiate into the (a) spermatids (b) spermatogonia (c) primary spermatocytes (d) secondary spermatocytes.
Last Answer : (d) secondary spermatocytes.
Description : Meiotic division of the secondary oocyte is completed (a) prior to ovulation (b) at the time of copulation (c) after zygote formation (d) at the time of fusion of a sperm with an ovum.
Last Answer : (d) at the time of fusion of a sperm with an ovum.
Description : Megaspores are produced from the megaspore mother cells after (a) mitotic division (b) formation of thick wall (c) differentiation (d) meiotic division.
Last Answer : d) meiotic division.
Description : Conversion of testosterone to dihydrotestosterone by the enzyme 5α-reductase is required for the following actions except: A. Formation of male external genitalia in the foetus B. Prostatic hypertrophy in elderly males C. Pubertal changes in the male adolescent D. Spermatogenesis
Last Answer : D. Spermatogenesis
Description : In Ulothrix/Spirogyra, reduction division (meiosis) occurs at the time of (a) gamete formation (b) zoospore formation (c) zygospore germination (d) vegetative reproduction.
Last Answer : (c) zygospore germination
Description : Offsets are produced by (a) meiotic divisions (b) mitotic divisions (c) parthenocarpy (d) parthenogenesis
Last Answer : b) mitotic divisions
Description : Offsets are produced by (1) Meiotic divisions (2) Mitotic divisions (3) Parthenocarpy (4) Parthenogenesis
Last Answer : (2) Mitotic divisions
Description : The microsporogenesis is the formation of a. Male gamete b. Female gamtete c. Female and male gamete d. Non of these
Last Answer : Male gamete
Description : Secondary spermatocytes undergo second meiotic division during spermatogenesis to produce.
Last Answer : Secondary spermatocytes undergo second meiotic division during spermatogenesis to produce. A. ... Spermatogonia `rarr` Sperms D. Spermatogonia
Description : First meiotic division during Oogenesis occurs in:
Last Answer : First meiotic division during Oogenesis occurs in: A. First polar body B. Second polar body C. Primary oocytes D. Secondary polar body
Description : In tobacco plant, the male gametes have twenty four chromosomes. What is the number of chromosomes in the female gamete? What is the number of chromosomes in the zygote? -Biology
Last Answer : The number of chromosome in the female gamete would be same as that in the male gamete, i.e., it will have 24 chromosomes. The number of chromosome in the zygote would be double the number present in the gamete and hence, it would be 48.
Description : (i) Mention the event that induces the completion of the meiotic division of the secondary oocyte. (ii) Trace the journey of the ovum from the ovary, its fertilisation and further development until the implantation of the embryo. -Biology
Last Answer : (i)Secondary oocyte completes meiosis-ll only when a sperm enters its cytoplasm. It forms a larger cell, the ootid and a small cell, the second polar body. (ii)The secondary oocyte is ... and inner cell mass.The trophoblast attacheds to endometrium (implantation) and blastocyst gets embedded in it.
Description : Each secondary spermatocyte after second meiotic division produces
Last Answer : Each secondary spermatocyte after second meiotic division produces A. Four haploid spermatids B. ... haploid spermatids D. Two diploid spermatids.
Description : In angiosperms regarding development of microgametophyte each microspore mother cell undergoes (a) Mitosis to produce 4 microspores (b) Two successive mitosis to form 4 microspores (c) Two successive meiotic division to form 4 microspores (d) Meiosis to produce 4 haploid microspores
Last Answer : Ans. ((d))
Description : Crossing over is followed by a. Meiotic division I b. Meiotic division II, c. Both d. None
Last Answer : Both
Description : The figure shows a section of human ovary. Select the option which gives the correct identification of either A or B with function/characteristic (a) B- Corpus luteum - Secretes progesterone (b) A- ... Secretes estrogen (d) A- Primary oocyte - It is in the prophase I of the meiotic division
Last Answer : (a) B- Corpus luteum - Secretes progesterone
Description : 26. Anaphase in second meiotic division is characterized by: (a) Separation of non-homologous chromosomes (b) Separation of homologous chromosomes (c) Separation of chromatids (d) All of them
Last Answer : Answer: c Separation of chromatids
Description : Endosperm is formed during the double fertilisation by (a) two polar nuclei and one male gamete (b) one polar nuclei and one male gamete (c) ovum and male gamete (d) two polar nuclei and two male gametes.
Last Answer : (a) two polar nuclei and one male gamete
Description : During gamete formation, the enzyme recombinate participates during
Last Answer : During gamete formation, the enzyme recombinate participates during A. Prophase-I B. Prophase-II C. Metaphase-I D. Anaphase-II
Description : What did flipping the coin during gamete formation simulate?
Last Answer : Need answer
Description : During gamete formation, the enzyme recombinase participates during (a) metaphase I (b) anaphase II (c) prophase I (d) prophase II
Last Answer : (c) prophase I
Description : During gamete formation, the enzyme recombinase participates during (1) Prophase-II (2) Metaphase-I (3) Anaphase-II (4) Prophase-I
Last Answer : (4) Prophase-I
Description : What principle states that during gamete formation genes for different traits separate without influencing each other’s inheritance? a. principle of dominance b. principle of independent assortment c. principle of probabilities d. principle of segregation
Last Answer : b. principle of independent assortment
Description : In a flowering plant male gamete is formed inside _____ -Science-7
Last Answer : In a flowering plant male gamete is formed inside anther.
Description : The male gamete producing structure of bryophyte is
Last Answer : antheridia.
Description : In case of a couple where the male is having a very low sperm count, which technique will be suitable for fertilisation? (a) Gamete Intracytoplasmic Fallopian Transfer (b) Artificial Insemination (c) Intracytoplasmic sperm injection (d) Intrauterine transfer
Last Answer : (b) Artificial Insemination
Description : Double fertilisation is fusion of (a) two eggs (b) two eggs and polar nuclei with pollen nuclei (c) one male gamete with egg and other with synergid (d) one male gamete with egg and other with secondary nucleus.
Last Answer : (d) one male gamete with egg and other with secondary nucleus.
Description : Double fertilisation is (a) fusion of two male gametes of a pollen tube with two different eggs (b) fusion of one male gamete with two polar nuclei (c) fusion of two male gametes with one egg (d) syngamy and triple fusion.
Last Answer : (d) syngamy and triple fusion.
Description : Which one of the following is surrounded by a callose wall? (a) Male gamete (b) Egg (c) Pollen grain (d) Microspore mother cell
Last Answer : (d) Microspore mother cell
Description : Synapsis occurs between (a) mRNA and ribosomes (b) spindle fibres and centromere (c) two homologous chromosomes (d) a male and a female gamete.
Last Answer : (c) two homologous chromosomes
Description : Select the wrong statement. (a) In oomycetes, female gamete is smaller and motile, while male gamete is larger and non- motile. (b) Chlamydomonas exhibits both isogamy and anisogamy and ... in structure, function and behaviour. (d) Anisogametes differ either in structure, function or behaviour.
Last Answer : (a) In oomycetes, female gamete is smaller and motile, while male gamete is larger and non- motile.
Description : In case of a couple where the male is having a very low sperm count, which technique will be suitable for fertilisation ? (1) Gamete intracytoplasmic fallopian transfer (2) Artificial Insemination (3) Intracytoplasmic sperm injection (4) Intrauterine transfer
Last Answer : (2) Artificial Insemination
Description : Double fertilization is (1) Fusion of two male gametes of a pollen tube with two different eggs (2) Fusion of one male gamete with two polar nuclei (3) Fusion of two male gametes with one egg (4) Syngamy and triple fusion
Last Answer : (4) Syngamy and triple fusion
Description : Cleavage divisions differ from normal mitotic divisions in that: (a) There is no nuclear division during cleavage (b) There is no division of cytoplasm during cleavage (c) The division of cytoplasm follows nuclear division (d) There is no period of growth in between divisions
Last Answer : Ans:(d)
Description : In ferns, meiosis takes place at the time of (a) spore formation (b) spore germination (c) gamete formation (d) antheridia and archegonia formation.
Last Answer : (a) spore formation
Description : Gregor Mendel used pea plants to study a. flowering. b. gamete formation. c. the inheritance of traits. d. cross-pollination.
Last Answer : c. the inheritance of traits.
Description : A hierarchical system in which cultural, political, and economic structures are dominated by males is a ______________. a. Elite model. b. Patriarchy. c. Pluralist model. d. Gendered division of labour.
Last Answer : b. Patriarchy.
Description : The scale of a galvanometer of resistance `100 ohms` contains 25 divisions. It gives a defelction of one division on passing a current of `4xx 10 ^(-4
Last Answer : The scale of a galvanometer of resistance `100 ohms` contains 25 divisions. It gives a defelction of one division ... is A. 150 B. 170 C. 110 D. 220
Description : Mark the correct option a) The Inspector should maintain a register of lines and stages in respect of his sub division in form M-40 b) Entries should be made in the register in alphabetical ... in accordance with correction memos issued by the Superinendent from time to time. d) All the above
Last Answer : d) All the above
Description : The least count of a Vernier scale is (A) Sum of the smallest divisions of main and Vernier scales (B) Value of one division of the primary scale divided by total number of divisions ... division of Vernier scale divided by total number of divisions of primary scale (D) None of these
Last Answer : (B) Value of one division of the primary scale divided by total number of divisions of Vernier scale
Description : The staff reading at a distance of 80 m from a level with the bubble at its centre is 1.31 m. When the bubble is moved by 5 divisions out of the centre, the reading is 1.39 m. The angular value of the one division of the bubble, is (A) 28.8 sec (B) 41.25 sec (C) 14.52 sec (D) 25.05
Last Answer : (B) 41.25 sec
Description : Five male teenagers and five female teens each step into ten separate circles. The males make disparaging remarks to the females while pointing their thumbs downward, and the female teens respond to ... loudly, until only one person is left who is legally performing the maneuver within t -Riddles
Last Answer : The two five-member teams are competing in a hula-hoop endurance contest. The theme song played during the competition is one of The Chipmunks greatest hits called: The Chipmunk’s Hula-Hoop Christmas Song.
Description : (i) Write the specific location and the functions of the following cells in human males Leydig cells Sertoli cells Primary spermatocyte (ii) Explain the role of any two accessory glands in human male reproductive system. -Biology
Last Answer : I)Oogenesis begins during the embryonic development stage when a million gamete mother cells (oogonia) are formed within each foetal ovary. (ii) (a) Sertoli cells are located on the inside ... provide nutrition to sperms. (b) Bulbourethral glands Their secretion helps in the lubrication of penis.
Description : Assertion : In male , urethra is considered as urinogenital duct . Reason : Urethra carries both urine and semen in males .
Last Answer : Assertion : In male , urethra is considered as urinogenital duct . Reason : Urethra carries both urine ... D. If both Assertion & Reason are False.
Description : . Select the incorrect statement. (a) Human males have one of their sex-chromosome much shorter than other. (b) Male fruit fly is heterogametic. (c) In male grasshoppers, 50% of sperms have no sex-chromosome. (d) In domesticated fowls, sex of progeny depends on the type of sperm rather than egg.
Last Answer : (d) In domesticated fowls, sex of progeny depends on the type of sperm rather than egg.