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Biology Test

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Stem is modified into cladode in

  1. casuarina

  2. asparagus

  3. opuntia

  4. euphorbia


Correct Option: B
Explanation:

Cladode is a type of phylloclade consisting of one internode only. These are cylindrical (not fleshy) and are mistaken for leaves

Verticillaster type of inflorescence is found in

  1. cotton

  2. datura

  3. lilium

  4. ocimum


Correct Option: D
Explanation:

Verticillaster is a complex inflorescence found in the Ocimum sanctum, a member of family Labiatae.

A simple one seeded fruit in which pericarp is fused with seed coat is

  1. achene

  2. caryopsis

  3. cypsela

  4. nut


Correct Option: B

The portion of DNA which contains information for an entire polypeptide is called

  1. cistron

  2. muton

  3. recon

  4. operon


Correct Option: A

Alburnum is also called

  1. autumn wood

  2. heart wood

  3. sap wood

  4. spring wood


Correct Option: C

The entry of pollen tube into the ovule through micropyle is called

  1. porogamy

  2. mesogamy

  3. anisogamy

  4. chalazogamy


Correct Option: A

Bicarpellary, syncarpous ovary with axile placentation is seen in

  1. solanaceae

  2. caesalpinaceae

  3. asteraceae

  4. malvaceae


Correct Option: A

The process of embryo formation without fertilization is known as

  1. apospory

  2. apogamy

  3. parthenocarpy

  4. polyembryony


Correct Option: B

Cholodny-Went Theory is related to

  1. photomorphogenesis

  2. photoperiodism

  3. phototropism

  4. photorespiration


Correct Option: C

Type of pollination in Commelina is

  1. chasmogamy

  2. geitonogamy

  3. xenogamy

  4. ceistogamy


Correct Option: D
Explanation:

Cleistogamy is seen in underground flowers of Commelina bengalensis which are small and inconspicuous. This plant also bears chasmogamous blue flowers above.

The hormone present in the liquid endosperm of coconut is

  1. cytokinin

  2. gibberellin

  3. ethylene

  4. auxin


Correct Option: A

The phytohormone, which influences apical dominance growth is

  1. IAA

  2. ABA

  3. GA3

  4. C2H4


Correct Option: A

An example of short day plant is

  1. wheat

  2. maize

  3. chrysanthemum

  4. radish


Correct Option: C
Explanation:

Short day plant (SDP) requires a relatively short day light period (usually 8-10 hrs.) and a continuous dark period of about 14-16 hours for subsequent flowering

The ovary after fertilization is converted into

  1. embryo

  2. endosperm

  3. fruit

  4. seed


Correct Option: C

The first compound that accepts CO2 during dark phase is

  1. NADP

  2. Ferrodoxin

  3. RUBP

  4. Cytochrome


Correct Option: C

Initiation codon for methionine is

  1. AAA

  2. UUU

  3. UAA

  4. AUG


Correct Option: D

Little leaf disease is caused by the deficiency of ___________, which is a micronutrient.

  1. copper

  2. zinc

  3. boron

  4. iron


Correct Option: B

The molecular formula of Chlorophyll ‘a’ is

  1. C55H72O5N4Mg

  2. C55H70O6N4Mg

  3. C55H72O6N4Mg

  4. C50H72O5N4Mg


Correct Option: A

Prechilling treatment to break seed dormancy is called

  1. scarification

  2. stratification

  3. impaction

  4. vernalization


Correct Option: D

The pyruvic acid formed during glycolysis is oxidized to CO2 and H2O in a cycle called

  1. calvin cycle

  2. nitrogen cycle

  3. hill reaction

  4. krebs cycle


Correct Option: D

Respiratory quotient (RQ) is one in case of

  1. fatty acids

  2. nucleic acids

  3. carbohydrates

  4. organic acids


Correct Option: C

Kranz anatomy is a morphological diversity in the leaves of

  1. C3-plants

  2. C4-plants

  3. C3 and C4-plants

  4. CAM plants


Correct Option: B
Explanation:

Kranz anatomy—It is a typical structure in the leaves of plants that have a C4-pathway of CO2 fixation. The leaves contain a ring of mesophyll cells, containing a few chloroplasts surroundings a sheath of bundle sheath cells having large chloroplasts involved in the Calvin cycle.

An example of free living nitrogen fixing aerobic bacteria is

  1. clostridium

  2. rhizobium

  3. azotobacter

  4. rhodospirillum


Correct Option: C

The plant which belongs to the Reed-Swamp stage in hydrarch succession is

  1. juncus

  2. sagittaria

  3. salix

  4. trapa


Correct Option: B

A gas produced by paddy fields and connected with global warming is

  1. CO2

  2. chlorine

  3. H2S

  4. methane


Correct Option: D
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