12 class  Biology Objective with option and Answers Chapter 1 Bihar Board – Reproduction in Organisms

Question 1. Single-celled animals are said to be immortal because

(a) they grow indefinitely in size

(b) they can tolerate any degree of change in temperature

(c) they can reproduce throughout their life span

(d) they continue to live as their daughter cells.

Answer:(d) they continue to live as their daughter cells.

Question 2.Which of the following has the longest life span?

(a) Banyan tree

(b) tortoise

(c) parrot

(d) Elephant

Answer:(a) Banyan tree

Question 3.Select the option which arranges the given organisms in ascending order of their life span.

(a) Parrot < Crow < Butterfly < Banyan tree

(b) Butterfly < Crow < Parrot < Crocodile

(c) Fruit fly < Crocodile < Parrot < Banyan tree

(d) Parrot < Tortoise < Dog < Crow

Answer:(c) Fruit fly < Crocodile < Parrot < Banyan tree

Question 4. ________ is a life process that is not essential for an individual’s survival but for survival of the species.

(a) Growth

(b) Reproduction

(c) Respiration

(d) Nutrition

Answer:(b) Reproduction

Question 5. ‘Clones’ are individuals that have exactly the same

(a) Lifespan

(b) physiology

(c) growth rate

(d) genetic makeup.

Answer:(d) genetic makeup.

Question 6.Which one of the following processes results in the formation of clone of bacteria?

(a) Regeneration

(b) Budding

(c) Binary fission

(d) Fragmentation

Answer:(c) Binary fission

Question 7.Asexual reproduction is seen in members of Kingdom

(a) Monera

(b) Plantae

(c) Animalia

(d) All of these.

Answer:(d) All of these.

Question 8.During binary fission in Amoeba which of the following organelles is duplicated?

(a) Plasma membrane

(b) Nucleus

(c) Contractile

(d) All of these

Answer:(b) Nucleus

Question 9.Vegetative propagation is the term used for

(a) sexual reproduction in animals

(b) sexual reproduction in plants

(c) asexual reproduction in animals

(d) asexual reproduction in plants.

Answer:(d) asexual reproduction in plants.

Question 10.Which of the following is not used for vegetative propagation?

(a) Bud

(b) Bulbil

(c) Turion

(d) Antherozoid

Answer:(d) Antherozoid

Question 11.Which of the following options shows two plants in which new plantlets arise from the same organ?

(a) Dahlia and ginger

(b) Potato and sweet potato

(c) Dahlia and rose

(d) Potato and sugarcane

Answer:(d) Potato and sugarcane

Question 12.Fleshy buds produced in the axil of leaves, which grow to form new plants when shed and fall on ground, are called

(a) bulbs

(b) bulbils

(c) tubers

(d) offsets.

Answer:(b) bulbils

Question 13.In which one pair, both the plants can be vegetatively propagated by leaf pieces?

(a) Bryophyllum and Kalanchoe

(b) Chrysanthemum and Agave

(c) Agave and Dioscorea

(d) Bryophyllium and Asparagus

Answer:(a) Bryophyllum and Kalanchoe

Question 14.If a leaf cell of Agave has x chromosomes then what will be the number of chromosomes in a cell of its bulbil?

(a) 2 x

(b) x/2

(c) x/4

(d) x

Answer:(d) x

Question 15.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

Answer:(b) A middle piece of sugarcane internode

Question 16.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

Answer:(b) Layering – Bulbils

Question 17.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.

Answer:(d) it assists in evolution by producing variations.

Question 18.The growth phase of an organism before attaining sexual maturity is referred to as

(a) juvenile phase

(b) vegetative phase

(c) both (a) and (b)

(d) none of these.

Answer:(c) both (a) and (b)

Question 19.Select the monocarpic plant out of the following.

(a) Bamboo

(b) Lite hi

(c) Mango

(d) All of these

Answer:(a) Bamboo

Question 20.Clear cut vegetative, reproductive and senescent phases cannot be observed in

(a) annual plants

(b) perennial plants

(c) biennial plants

(d) ephemeral plants.

Answer:(b) perennial plants

Question 21.Strobilanthus kunthiana flowers once in

(a) 5 years

(b) 12 years

(c) 20 years

(d) 50 years.

Answer:(b) 12 years

Question 22.Strobilanthus Cynthiana differs from bamboo in

(a) being monocarpic

(b) length of juvenile phase

(c) being polycarpic

(d) none of these.

Answer:(b) length of juvenile phase

Question 23.Oestrous cycle is reported in

(a) cows and sheep

(b) humans and monkeys

(c) chimpanzees and gorillas

(d) none of these.

Answer:(a) cows and sheep

Question 24.Which of the following animals show menstrual cycle ?

(a) Gorillas and chimpanzees

(b) Monkeys and humans

(c) Orangutans and monkeys

(d) All of these

Answer:(d) All of these

Question 25.Senescent phase of an organism’s life span can be recognised by

(a) slow metabolism

(b) cessation of reproduction

(c) decreased immunity

(d) all of these

Answer:(d) all of these

Question 26.If a fungal thallus has both male and female reproductive structures, it will be called

(a) heterothallic

(b) homothallic

(c) dioecious

(d) monoecious

Answer:(b) homothallic

Question 27.Staminate flowers produce

(a) eggs

(b) antherozoids

(c) fruits

(d) all of these

Answer:(b) antherozoids

Question 28.Which of the following groups is formed only of the hermaphrodite organisms?

(a) Earthworm, tapeworm, housefly, frog

(b) Earthworm, tapeworm, sea horse, housefly

(c) Earthworm, leech, sponge, roundworm

(d) Earthworm, tapeworm, leech, sponge

Answer:(d) Earthworm, tapeworm, leech, sponge

Question 29 .Which of the following options shows bisexual animals only?

(a) Amoeba, sponge, leech

(b) Sponge, cockroach, Amoeba

(c) Earthworm, sponge, leech

(d) Tapeworm, earthworm, honeybee

Answer:(c) Earthworm, sponge, leech

Question 30.Read the following statements and select the incorrect one.

(a) Cucurbits and coconuts are monoecious plants.

(b) Papayas and date palms are dioecious plants.

(c) Leeches and tapeworms are bisexual animals.

(d) Sponges and coelenterates are unisexual animals.

Answer:(d) Sponges and coelenterates are unisexual animals.

Question 31.Meiosis does not occur in

(a) asexually reproducing diploid individuals

(b) sexually reproducing haploid individuals

(c) sexually reproducing diploid individuals

(d) all of these.

Answer:(a) asexually reproducing diploid individuals

Question 32.A diploid parent plant body produces ________ gametes and a haploid parent plant body produces ________ gametes.

(a) diploid, haploid

(b) haploid, diploid

(c) diploid, diploid

(d) haploid, haploid

Answer:(d) haploid, haploid

Question 33.Which of the following organisms has the highest number of chromosomes?

(a) Housefly

(b) Butterfly

(c) Ophioglossum

(d) Onion

Answer:(c) Ophioglossum

Question 34.In maize, a meiocyte has 20 chromosomes. What will be the number of chromosomes in its somatic cell?

(a) 40

(b) 30

(c) 20

(d) 10

Answer:(c) 20

Question 35.If a butterfly has chromosome number 360 in its meiocyte (2n). What will be the chromosome number in its gametes?

(a) 380

(b) 190

(c) 95

(d) 760

Answer:(b) 190

Question 36.In flowering plants, both male and female gametes are non-motile. The method to bring them together for fertilisation is

(a) water

(b) air

(c) pollination

(d) apomixis

Answer:(c) pollination

Question 37.Development of new individual from female gamete without fertilisation is termed as

(a) syngamy

(b) embryogenesis

(c) oogamy

(d) parthenogenesis.

Answer:(d) parthenogenesis.

Question 38.Fertilisation cannot occur in absence of surface water in

(a) Fucus

(b) Funaria

(c) Marsilea

(d) all of these.

Answer:(d) all of these.

Question 39.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 fertilisation

(d) occurs during vegetative growth.

Answer:(c) occurs after fertilisation

Question 40.Life begin in all sexually reproducing organisms as a

(a) single-celled zygote

(b) double-celled zygote

(c) haploid zygote

(d) haploid gametes.

Answer:(a) single-celled zygote

Question 41.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.

Answer:(a) It is usually biparental.

Question 42.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.

Answer:(a) proper embryonic care and protection is absent

Question 43.Deposition of calcareous shell around zygote occurs in

(a) birds and reptiles

(b) birds and mammals

(c) mammals and reptiles

(d) all of these.

Answer:(a) birds and reptiles

Question 44.Select the option which shows viviparous animals only,

(a) Lizard, Turtile

(b) Platypus, Crocodile

(c) Cow, Crocodile

(d) Whale, Mouse

Answer:(d) Whale, Mouse

Question 45.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)

Answer:(d) Both (a) and (c)

Question 46.Viviparity is found in

(a) Sharks

(b) lizards

(c) frogs

(d) birds

Answer:(a) Sharks

Question 47.In which of the following plants, sepals do not fall off after fertilisation and remain attached to the fruit?

(a) Brinjal

(b) Cucumber

(c) Papaya

(d) Bitter gourd

Answer:(a) Brinjal

Question 48.The wall of the ovary forms

(a) pericarp

(b) fruit wall

(c) fruit

(d) both (a) and (b).

Answer:(d) both (a) and (b).

Question 49.The term ‘clone’ cannot be applied to offspring formed by sexual reproduction because

(a) offspring do not possess exact copies of parental DNA

(b) DNA of only one parent is copied and passed on to the offspring

(c) offspring are formed at different times

(d) DNA of parent and offspring are completely different

Answer:(a) offspring do not possess exact copies of parental DNA

Question 50.The male gametes of rice plant have 12 chromosomes in their nucleus. The chromosome number in the female gamete, zygote and the cells of the seedling will be, respectively

(a) 12,24,12

(b) 24,12,12

(c) 12, 24, 24

(d) 24, 12, 24.

Answer:(c) 12, 24, 24

Question 51.Appearance of vegetative propagules from the nodes of plants such as sugarcane and ginger is mainly because

(a) nodes are shorter than intemodes

(b) nodes have meristematic cells

(c) nodes are located near the soil

(d) nodes have non-photosynthetic cells.

Answer:(b) nodes have meristematic cells

Question 52.There is no natural death in single celled organisms like Amoeba and bacteria because

(a) they cannot reproduce sexually

(b) they reproduce be binary fission

(c) parental body is distributed among the offspring

(d) they are microscopic.

Answer:(c) parental body is distributed among the offspring

Question 53.There are various types of reproduction. The type of reproduction adopted by an organism depends on

(a) the habitat and morphology of the organism

(b) morphology of the organism

(c) morphology and physiology of the organism

(d) the organisms habitat, physiology and genetic makeup.

Answer:(d) the organisms habitat, physiology and genetic makeup.

Question 54.Which of the following is a post-fertilisation event in flowering plants?

(a) Transfer of pollen grains

(b) Embryo development

(c) Formation of flower

(d) Formation of pollen grains

Answer:(b) Embryo development

Question 55.The number of chromosomes in the shoot tip cells of a maize plant is 20. The number of chromosomes in the microspore mother cells of the same plant shall be

(a) 20

(b) 10

(c) 40

(d) 15

Answer:(a) 20

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