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 Multiple Choice QuestionsMultiple Choice Questions

11.

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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12.

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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13.

Which of the following two hormones are essential for induced breeding of fishes?

  • TSH and ACTH

  • Oestrogen and progesterone

  • FSH and LH

  • Vasopressin and oxytocin


C.

FSH and LH

Induced or artificial methods of breeding are used to obtain desirable eggs. In this ova from the desired female and sperms from the desired male are obtained by artificial mechanical process and the ova gets fertilized by the sperms and then fertilized eggs are collected. FSH and LH present in pituitary extract helps in induced breeding.


14.

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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15.

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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16.

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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17.

One micrometer is equal to

  • 0.0001 mm

  • 0.001 mm

  • 0.01 mm

  • 0.00001 mm


B.

0.001 mm

1 micrometre/ micron/ μm/ μ = 0.001 mm

1 mm  = 10-3 mm = 10 -6 m = 10-4 cm                    


18.

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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19.

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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20.

How many ovum are developed in ovary of Hydra?

  • Two

  • Many

  • One

  • Three


C.

One

In Hydra generally one egg is present in ovary but sometimes in unfavourable condition two eggs are formed.