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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which one of the following plants is monoecious?

  • Marchantia

  • Pinus

  • Cycas

  • Papaya


B.

Pinus

Pinus is monoecious, which bear male cone as well as a female cone on the same tree on separate branches.
Marchantia Cyas and papaya are dioecious plants

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2.

What will you look for to identify the sex of the following?

  • male frog - a copulatory pad on the first digit of the hind limb

  • Female cock - anal cerci

  • Male shark - claspers borne on pelvic fins

  • Female Ascaris - sharply curved posterior end


C.

Male shark - claspers borne on pelvic fins

A clasper is a male anatomical structure found in some groups of animals, and used in mating. Male cartilaginous fish like shark hacve claspers formed from the posterior portion of their pelvic fin which serves as intromittent organs used to channel semane into the female's cloaca during mating.

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3.

Keel  is characteristic of the flowers of 

  • gulmohur

  • cassia

  • Calatropis

  • Bean


D.

Bean

The bean or legume family is one of the most common plant families. Flowers in bean family typically have their two bottom petals grown together along one side forming a structure a bit like a narrow but deep scoop. This special Bean- family kind of two -in-one petal is called the keel, like the keel of a boat. Bean blossoms with the configuration are said to be papilionaceous.

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4.

Male gametes are flagellated in

  • Polysiphonia

  • Anabaena

  • Ectocarpus

  • Spirogyra


C.

Ectocarpus

Male gametes are flagellated in Ectocarpus belonging to Phaeophyceae. The flagella of male and gamete plays an important role in establishing initial sexual contact with the female gamete. However, in Ectocarpus the female gamete too is flagellated but is different in structure. 
In Polysiphonia (Rhodophyceae) flagellated gametes are not observed, in Anabaena sexual reproduction through gametes is absent while in Spirogya sexual reproduction takes place by conjugation wherein male gamete passes through a tube to the adjacent filament. The male gametes here are non-flagellated and show amoeboid movement. 

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5.

Archegoniophore is present in 

  • Chara

  • Adiantum 

  • Funaria

  • Marchantia


D.

Marchantia

In Marchantia, a bryophyte, the archegonia (female sex organs) are borne on special branches called archegoniophore or female receptacles. Each archegoniophore has rows of archegonia protected by involucre or perichaetium.

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6.

In cloning of cattle a fertillized egg is taken out of the mother’s womb and

  • the egg is divided into 4 pairs of cells which are implanted into the womb of other cows

  • in the eight cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb of other cow

  • in the eight cell stage the individual cells are separated under electrical field for further development in culture media

  • from this upto eight identical twins can be produced


B.

in the eight cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb of other cow

In cloning of cattle a fertilized egg divides in 2, then in 4 and then in 8. This embryo is carefully removed from the womb. The embryonic cells are then separated using enzyme. Each isolated cell is kept in a nutrient medium and later implanted in the womb of a different 'host mother' cow.

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7.

Examine the figure below and select the right option giving all the four part (A, B,C and D) correctly identified.


  • A

    B

    C

    D

    Archegoni Ophore

    Female thallus

    Gemma cup

    Rhizoids

  • A

    B

    C

    D

    Archegoni

    Female thallus Bud Foot
  • A

    B

    C

    D

    Seta

    Sporophyte Protonema Rhizods
  • A

    B

    C

    D

    Antheridiophore

    Male thallus Globule Roots

A.

A

B

C

D

Archegoni Ophore

Female thallus

Gemma cup

Rhizoids

Marchantia, a liverwort, is dioecious. The female thallus bears female sex organs called archegonia on special branches called archegoniophores. The plant's body is anchored by unicellular rhizoids.

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8.

What is common between vegetative reproduction and apomixis?

  • Both are applicable to only dicot plants

  • Both bypass the flowering phase

  • Both occur round the year

  • Both produces progeny identical to the parent


D.

Both produces progeny identical to the parent

Both vegetative and apomixis are an asexual reproduction. The progeny produced are genetically similar to a parent and are called clone.

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9.

How many different kinds of gametes will be produced by a plant having the genotype AABbCC?

  • Three

  • Four

  • Nine

  • Two


D.

Two

The types of gametes produced by a plant depend upon the number of hetrozygous pair.
Number of types of gametes  = Zn
   n = number of heterozygous pair
                 21 = 2
The gametes are  - ABC and AbC.

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10.

Monoecious plant of Chara shows occurrence of 

  • antheridiophore and archengoniophore on the same point

  • stamen and carpel on the same plant

  • upper antheridium and lower oogonium on the same plant

  • upper oogonium and lower antheridium on the same plant


D.

upper oogonium and lower antheridium on the same plant

Monoecious or homothallic, a condition in Chara (green algae) is used to denote upper oogonium and lower antheridium on the same plant. The organisms, which possess both the reproductive organs are bisexual. Unisexual condition represents both male or female organs in the same organism.

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