Find out the correct option:

  • Among animals, insects, particularly bees are the dominant biotic pollinating agents

  • Often flowers of animal- pollinated plants are specially adapted for particular species of animals

  • In some species floral rewards like edible nectar, pollen grains, shelter for egg laying are given to pollinating animals

  • All the above are correct

a. Flowers are usually large, colourful, fragrant

b. Pollen grains are produced in large number

c. Pollen grains are light in weight and non-sticky

d. Sticky pollen grains

e. Stigma inserted and sticky

f. Edible pollen grains and nectar.

Which of the above characters favour entomophily?

  • II, IV, V           

  • I, II, III, VI      

  • III, IV, V          

  • I, IV, V, VI

A homogamous tall pistillate plant (TT) is crossed with homogamous dwarf staminate plant (tt). What is the genotype of endosperm?

  • TTT                 

  • TTt                 

  • Ttt                            

  • ttt

For artificial hybridisation experiment in bisexual flower, which of the sequences is correct?

  • Bagging → Emasculation → Cross pollination → Rebagging

  • Emasculation → Bagging → Cross pollination → Rebagging

  • Cross pollination → Bagging → Emasculation → Rebagging

  • Self-pollination → Bagging → Emasculation → Rebagging

Which of the following is false?

I. Endosperm formation starts prior to first division of zygote

II. Angiospermic endosperm is mostly 3N while gymnospermic one is N.

III. The most common type of endosperm is nuclear.

IV. Coconut has both liquid nuclear (multinucleate) and cellular endosperm.

V. Milky water of green tender coconut is liquid female gametophyte.

  • I and II only   

  • III only           

  • V only             

  • II only

Diagram given below shows stages in embryogenesis in a typical dicot (Capsella). Identify structures A to D respectively:
  • () Suspensor, Radicle, Plumule, Cotyledons
  • () Hypophysis, Radicle, Plumule, Cotyledons
  • () Suspensor, Plumule, Radicle, Cotyledons
  • () Suspensor, Radicule, Plumule, Hypocotyls

Go through the given diagram of a typical dicot embryo. In which of the following all the 3 parts labelled as A, B, C with their respective functions are correctly identified?

 

A

B

C

(a)

Plumule,

shoot system

formation

Radicle,

root system

formation

Hypophysis,

formation of

radicle

(b)

Plumule,

shoot system

formation

Radicle,

root system

formation

Cotyledon,

food storage

(c)

Radicle,

root system

formation

Plumule,

shoot system

formation

Cotyledon,

food storage

(d)

Radicle,

root system

formation

Plumule,

shoot system

formation

Endosperm,

food storage
  • 1
  • 2
  • 3
  • 4

Which are the external conditions required for seed germination:

  • Oxygen, carbon dioxide and suitable temperature

  • Oxygen, light and suitable temperature

  • Light, moisture and suitable temperature

  • Oxygen, moisture and suitable temperature

Which of the following is not correct?

  • As the seed matures, its water content is reduced and seeds become relatively dry(10-15% moisture by mass)

  • The seed dormancy is the internal or innate inhibition of generation of normal or viable seeds

  • Embryo in dormant seed shows higher rate of general metabolic rate

  • Because of dormancy seeds remain viable for longer period and can be stored

Which of the following will lose its economic value if fruits are produced through parthenocarpy:

  • Citrus             

  • Banana           

  • Grape             

  • Pomegranate

Which of the following statements is false?

  • Some 2000 years old viable seeds of Pheonix dactylifera were discovered during archaeological excavation of King Herod's palace near Dead Sea

  • Record of 10,000 years of dormancy of seeds has been estimated in Lupinus arcticus

  • The number of seeds in each fruit in case of orchid and some parasitic forms like Orobanche and Striga is one

  • Many fruits have evolved mechanisms for dispersal of seeds

Hybrid seeds have to be produced every year because:

  • Hybrid plants become sterile in coming years

  • They show more heterosis in coming years

  • Hybrid vigour is not maintained beyond one generation as segregation of genes begins in the second generation

  • Hybrid seed industry tends to increase cost of the seeds

Active research is going on in many laboratories around the world to understand the genetics of apomixis. What is the purpose of such active research?

  • Hybrid plants are directly formed by apomixis

  • Apomixis is the method to produce seed without fertilization

  • To transfer apomictic genes into hybrid varieties which will prevent loss of hybrid vigour with successive years

  • Apomixis produces genetically different individuals

Both, autogamy and geitonogamy are prevented in:

  • Papaya           

  • Cucumber       

  • Castor             

  • Maize

Pollen tube, after reaching the ovary, does not show following event:

  • Enters the ovule through the micropyle

  • May enter the ovule through chalaza

  • Enters one of the synergid through filiform apparatus

  • Chemotactic movement of pollen tube towards synergid

In which organ the growth of pollen tube is observed, till it reaches the ovules?

  • .Pollen tube

  • .Style

  • C.Ovary

  • .Stigma

Polygonum type embryo sac is

 

  • All are correct

  • Monosporic

  • Seven celled with one largest binucleate cell

  • Eight nucleated with 3 + 2 + 3 arrangement

A plant breeder employ technique of emasculation

  • To cover the flower with a bag

  • To prevent self-pollination
  • To prevent stamen from being contaminated
  • To produce female plant

Which one of the following statement is false in respect of flowering plants?

  • Parthenocarpy can be induced through the application of growth hormones

  • Integuments encircle the ovule except at the tip where a small opening called the germ pore is organized
  • Endosperm development precedes embryo development
  • Apomicts have several advantages in horticulture and agriculture

To form four fully developed Polygonum type of embryosacs in angiosperms total number of meiosis and mitosis divisions generations required are :-

  • 4, 12

  • 1, 3

  • 4, 4

  • 1, 12

Megaspore mother cell differentiates from

  • Nucellus in the micropylar region.

  • Nucellus in the chalazal region.

  • Primary parietal cell in chalazal region.

  • Integument cell in micropylar region.

Which of the following has proved helpful in preserving pollens as fossils?

  • Pollenkit

  • Cellulosic intine

  • Oil content

  • Sporopollenin

Winged pollen grains are present in
  • 1 Mustrd
  • 2. Cycas
  • 3. Mango
  • 4. Pinus

Pollen grains can be stored for several years in liquid nitrogen having a temperature of

  • –120 °C

  • –80 °C

  • –196 °C

  • –160 °C

Double fertilization is

  • Fusion of two male gametes of a pollen tube with two different eggs

  • Fusion of one male gamete with two polar nuclei
  • Fusion of two male gametes with one egg
  • Syngamy and triple fusion

Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?

 
  • Hydrilla
  • Yucca
  • Banana
  • Viola

Double fertilization is exhibited by:

  • Algae

  • Fungi

  • Angiosperms

  • Gymnosperms

Proximal end of the filament of stamen is attached to the

 
  • connective
  • placenta
  • thalamus or petal
  • anther
The coconut water from tender coconut represents

Transmission tissue is characteristic feature of
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