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Biology (Medical Entrance)

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Ruminate endosperm is commonly found in the seeds of

  1. Euphorbiaceae

  2. Cruciferae

  3. Annonaceae

  4. Compositae


Correct Option: C
Explanation:

Ruminate endosperm is commonly found in the seeds of Annonaceae

The growth of pollen tube towards ovule is due to

  1. geotropism

  2. thigmotropism

  3. chemotropism

  4. hydrotropism


Correct Option: C

The endosperm of Brassica campestris is

  1. haploid

  2. diploid

  3. triploid

  4. tetraploid


Correct Option: C

In unisexual plants, sex can be changed by application of

  1. Auxins (or Ethylene)

  2. ABA

  3. Ethanol

  4. Cytokinins


Correct Option: A

Syngamy means

  1. fusion of similar spores

  2. fusion of dissimilar spores

  3. fusion of cytoplasms

  4. fusion of gametes


Correct Option: D

Pollen tube at the time of entering embryo sac has

  1. four gametes

  2. three male gametes

  3. two male gametes

  4. one gamete nucleus


Correct Option: C

The phenomenon of vernalization was described for the first time by

  1. Went

  2. Lysenko

  3. Kurosawa

  4. Aristotle


Correct Option: B

Maximum growth occurs in

  1. lag phase

  2. senescent phase

  3. exponential phase

  4. decline phase


Correct Option: C

Malacophily is the name given to pollination by

  1. bats

  2. birds

  3. snails

  4. insects


Correct Option: C

Vernalization is

  1. flowering induction by low temperature treatment of moist seeds

  2. growth curvature in response to light

  3. cycle of day and night

  4. effect of day length on plant growth


Correct Option: A

Richmond-Lang effect is shown by

  1. auxins

  2. gibberellins

  3. kinetin

  4. sugars


Correct Option: C

Opening and closing of flowers represent a kind of

  1. autonomic movement

  2. nutation

  3. tropic movement

  4. nastic movement


Correct Option: D

Fusion of one male gamete with the egg cell and fusion of another male gamete with secondary nucleus is called

  1. apomixis

  2. double fertilization

  3. triple fertilization

  4. karyogamy


Correct Option: B

Pollination characteristically occurs in

  1. Angiosperms and Fungi

  2. Angiosperms and Gymnosperms

  3. Pteriodophytes and Angiosperms

  4. Bryophytes and Angiosperms


Correct Option: B

Insect-pollinated flowers usually possess

  1. brightly coloured pollen

  2. dry pollens with smooth surface

  3. sticky pollens with rough surface

  4. large quantities of pollen


Correct Option: C

A close relation between flower and pollinating agent is best exhibited by

  1. Cocos

  2. Salvia

  3. Yucca

  4. Avena


Correct Option: C

The insect Blastophaga grossorum is associated with the pollination of

  1. mango

  2. paddy

  3. beans

  4. ficus


Correct Option: D

Work of Garner and Allard is related with

  1. photolysis

  2. photophosphorylation

  3. phototropism

  4. photoperiodism


Correct Option: D

If a pollen of a flower falls on the stigma of another flower belonging to the same plant, it is

  1. ecologically self-pollination

  2. genetically and ecologically cross pollination

  3. genetically self-pollination and ecologically cross-pollination

  4. none of these


Correct Option: C

The fusion product of polar nuclei and male gamete is

  1. microsporocyte

  2. primary endosperm nucleus

  3. zygote

  4. secondary nucleus


Correct Option: B

Entomophilous flowers are

  1. very large in size

  2. colourless flowers

  3. coloured and scented

  4. small in size


Correct Option: C

Pollination by ants is called

  1. malacophily

  2. myrmecophily

  3. entomophily

  4. ornithophily


Correct Option: B

A typical example of cross pollination is

  1. rice

  2. maize

  3. wheat

  4. cotton


Correct Option: B

Which condition prevents self-pollination?

  1. Herkogamy

  2. Dichogamy

  3. Self sterility

  4. All the above


Correct Option: D

Porogamy is

  1. entry of the pollen tube in the ovule through micropyle

  2. entry of the pollen tube in the ovule through chalaza

  3. entry of the pollen tube in the stigma and style

  4. entry of the pollen tube in the ovule through integuments


Correct Option: A

A bisexual flower which never opens in its life span is known as

  1. homogamous

  2. heterogamous

  3. dichogamous

  4. cleisto gamous


Correct Option: D

Translator mechanism is found in

  1. Ocimum

  2. Pisum

  3. Calotropis

  4. Yucca


Correct Option: C

Bioassay for auxin is

  1. avena curvature test

  2. green leaf test

  3. dwarf maize test

  4. cell division test


Correct Option: A

Elongation of a genetically dwarf plant is possible by the application of

  1. vitamin

  2. kinetin

  3. gibberellins

  4. X-rays


Correct Option: C

Milky water of green coconut is

  1. liquid nucellus

  2. liquid of female gametophyte

  3. liquid endosperm

  4. liquid chalaza


Correct Option: C

When pollen of a flower is transferred to the stigma of another flower of the same plant, the pollination is referred to as

  1. xenogamy

  2. geitonogamy

  3. autogamy

  4. allogamy


Correct Option: B

Parthenocarpy is most commonly seen in

  1. banana

  2. litchi

  3. apple

  4. mango


Correct Option: A

Lever mechanism or turnpipe mechanism for pollination is a characteristic feature of

  1. Antirrhinum

  2. Ocimum

  3. Salvia

  4. Ficus


Correct Option: C

The formation of fruits without fertilization is known as

  1. parthenocarpy

  2. parthenogenesis

  3. polyembryony

  4. polygamy


Correct Option: A

Hydrophily is best demonstrated by

  1. Nelumbium

  2. Vallisneria

  3. Eichhornia

  4. Nymphaea


Correct Option: B
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