Reproduction in Organisms

Class 12 Biology Chapter 1 Objective in English : Here you can find class 12th biology Objective questions for board exam 2023. Reproduction in Organisms objective questions is very important for board exam 2022 – 2023. mcqs questions for class 12 biology chapter 1 in english. important question website

12th Biology Chapter 1 Objective Questions in English

  1. Which of the following cannot serve as a vegetative propagule?

(a) A piece of potato tuber with eyes

(b) A middle piece of sugarcane internode

(c) A piece of ginger rhizome

(d) A marginal piece of Bryophyllum leaf

Ans (b)

  1. Which of the following options correctly identifies artificial and natural methods of vegetative propagation?

Artificial methods – Natural methods

(a) Grafting – Cutting

(b) Layering – Bulbils

(c) Offset – Tissue culture

(d) Tubers – Rhizomes

Ans (b)

  1. Sexual reproduction is considered more beneficial than asexual reproduction because

(a) it is not affected by adverse environmental conditions

(b) fertilization is a chance factor

(c) it rapidly multiplies the population

(d) it assists in evolution by producing variations.

Ans (d)

  1. Development of new individual from female gamete without fertilisation is termed as

(a) syngamy

(b) embryogenesis

(c) oogamy

(d) parthenogenesis.

Ans (d)

  1. Fertilisation cannot occur in absence of surface water in

(a) Fucus

(b) Funaria

(c) Marsilea

(d) all of these.

Ans (d)

  1. Spirogyra is a sexually reproducing alga in which vegetative thallus is haploid. In Spirogyra, meiosis

(a) never occurs

(b) occurs at time of gamete production

(c) occurs after fertilization

(d) occurs during vegetative growth.

Ans (c)

  1. Life begin in all sexually reproducing organisms as a

(a) single-celled zygote

(b) double-celled zygote

(c) haploid zygote

(d) haploid gametes.

Ans (a)

  1. Which of the following is not correct regarding sexual reproduction ?

(a) It is usually biparental.

(b) Gametes are always formed.

(c) It is a slow process

(d) It involves only mitosis.

Ans (a)

  1. Offsprings of oviparous animals are at greater risk of survival as compared to those of viviparous animals because

(a) proper embryonic care and protection is absent

(b) embryo does not develop completely

(c) progenies are of smaller size

(d) genetic variations do not occur.

Ans (a)

  • Deposition of calcareous shell around zygote occurs in

(a) birds and reptiles

(b) birds and mammals

(c) mammals and reptiles

(d) all of these.

Ans (a)

  1. Select the option which shows viviparous animals only,

(a) Lizard, Turtile

(b) Platypus, Crocodile

(c) Cow, Crocodile

(d) Whale, Mouse

Ans (d)

  1. Which of the following animals give birth to young ones?

(a) Ornithorhynchus and Echidna

(b) Macropus and Pteropus

(c) Balaenoptera and Homo sapiens

(d) Both (a) and (c)

Ans (d)

  1. Viviparity is found in

(a) Sharks

(b) lizards

(c) frogs

(d) birds

Ans (a)

  1. In which of the following, calyx covers the whole fruit? 

(a) Physalis 

(b) Tomato

(c) Brinjal 

(d) Litchi

Ans (A)

  1. The Oestrus cycle occurs in 

(a) dog

(b) cow

(c) buffalo 

(d) all of these

Ans (D)

  1. Which one of these is haploid? 

(a) Egg 

(b) Zygote

(c) Integument 

(d) Nucellus

Ans (A)

  1. Which one of these is diploid? 

(a) Egg 

(b) Pollen

(c) Male gamete

(d) Zygote

Ans (D)

  1. In which of the following plant body is a gametophyte? 

(a) Algae 

(b) Fungi

(c) Bryophytes 

(d) All of these

Ans (D)

  1. Which of the following is oviparous? 

(a) Crocodile 

(b) Snake

(c) Hen 

(d) All of these

Ans (D)

  1. Diploid chromosome number in potato is

(a) 34 

(b) 40

(c) 48 

(d) 32

Ans (C)

  1. Haploid chromosome number in a dog is 

(a) 23 

(b) 39

(c) 19

(d) 4

Ans (B)

  1. The multiplication of genetically identical copies of a cultivar by asexual means is called

(a) mass culture of plant cells

(b) organogenesis 

(c) clonal variation

(d) None of these

Ans (C)

  1. Parthenogenesis is the development of

(a) fruit without hormones

(b) embryo without fertilization

(c) embryo from an egg without fertilization 

(d) fruit without fertilization

Ans (C)

  1. Upon fertilization, while the ovule develops into a seed, which structure develops from the carpel?

(a) Perisperm 

(b) Pericarp

(c) Testa 

(d) None of these

Ans (B)

  1. Which one is not an oviparous animal?

(a) Snake 

(b) Chicken

(c) Crocodile 

(d) Human

Ans (D)

  1. Which of the following is incorrect? 

(a) The length of time which an organism is likely to live is called its life span.

(b) Binary fission takes place in Bacteria and Amoeba.

(c) Hydra reproduces asexually by budding. 

(d) Strobilanthus kunthiana flowers once in two years.

Ans (D)

  1. New plants develop from leaves in 

(a) Eichhornia 

(b) Bryophyllum

(c) Cycas 

(d) Gladiolus

Ans (B)

  1. External fertilization takes place in 

(a) algae 

(b) reptiles

(c) birds 

(d) mammals

Ans (A)

  1. External fertilization does not takes place in 

(a) oyster 

(b) sea star

(c) jellyfish 

(d) mammals

Ans (D)

  1. Internal fertilization takes place in 

(a) birds 

(b) frog

(c) algae 

(d) fish

Ans (A)

  1. Reproduction by ‘budding’ occurs in 

(a) yeast 

(B) paramecium

(C) penicillium

(D) all of these

Ans (A)

  1. Penicillium reproduces by : 

(a) budding 

(b) fragmentation

(c) gemmules

(d) conidia

Ans (D)

  1. In which of the following fertilization is internal? 

(a) Fishes

(b) Amphibians 

(c) Majority of Algae

(d) Angiosperms

Ans (D)

  1. Which one is incorrect? 

(a) Sexual reproduction involves the formation and fusion of gametes

(b) Pre-fertilization events include gametogenesis and gamete transfer

(c) Gametes are diploid in nature. 

(d) Syngamy occurs between the male and female gametes

Ans (C)

  1. Morphologically and genetically similar organisms are called

(a) clone 

(b) somaclones

(c) cosmids

(d) hybrids

Ans (A)

  1. In which of the following water is not essential for gamete transfer?

(a) Algae 

(b) Bryophytes

(c) Pteridophytes

(d) Gymnosperms

Ans (D)

  1. Which one has a diploid parental body? 

(a) Fungi 

(b) Human

(c) Algae 

(d) Bryophytes

Ans (B)

  1. Binary fission takes place in 

(a) Amoeba 

(b) Paramecium

(c) Bacteria 

(d) None of the above

Ans (B)

  1. Which of the following reproduces by budding? 

(a) Hydra 

(b) Saccharomyces

(c) Amoeba 

(d) (a) and (b)

Ans (D)

  1. Aplanospores are formed in 

(a) Sycon 

(b) Rhizopus

(c) Mucor 

(d) (b) and (c)

Ans (D)

  1. Conidia are formed in 

(a) Aspergillus.

(b) Rhizopus 

(c) Chlamydomonas

(d) None of the above

Ans (A)

  1. Which of the following is a modified stem and used for vegetative propagation?

(a) Rhizome 

(b) Bulb

(c) Tuber 

(d) All of the above

Ans (D)

  1. Which statement is correct with regard to Eichhornia?

(a) It is an aquatic plant.

(b) It is also known as the terror of Bengal. 

(c) It reproduces by offset.

(d) All of the above

Ans (D)

  1. Which one is monocarpic? 

(a) Agave 

(b) bamboo

(c) (a) and (b) 

(d) Kalanchoe

Ans (C)

  1. In which of the following ‘new plants develop on leaves?

(a) Bryophyllum

(b) Kalanchoe

(c) (a) and (b) 

(d) Helianthus

Ans (C)

  1. Internal fertilization takes place in 

(a) Mammals 

(b) Reptiles

(c) Birds 

(d) All of the above

Ans (D)

  1. Which of the following type of gametes occur in Chlamydomonas?

(a) Isogametes 

(b) Anisogametes

(c) Oogametes 

(d) All of the above

Ans (D)

  1. Which of the following is a hermaphrodite?

(a) Tapeworm

(b) Sponge 

(c) Earthworm 

(d) All of the above

Ans (D)

  1. Which of the following are formed without completion of the fertilization process?

(a) Bee 

(b) Pea

(c) Rotifers

(d) (a) and (c)

Ans (D)

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