Sexual Reproduction in Flowering Plants

Coconut water from a tender coconut is

1. innermost layers of the seed coat
2. degenerated nucellus
3. immature embryo
4. free nuclear endosperm.

Which one of the following fruits is parthenocarpic?

1. Jackfruit
2. Banana
3. Brinjal
4. Apple

Male gametophyte in angiosperms produces

1. single sperm and two vegetative cells
2. three sperms
3. two sperms and a vegetative cell
4. single sperm and a vegetative cell.

Which of the following are the important floral rewards to the animal pollinators?

1. Floral fragrance and calcium crystals
2. Protein pellicle and stigmatic exudates
3. Colour and large size of flower
4. Nectar and pollen grains

Which one of the following may require pollinators, but is genetically similar to autogamy?

1. Apogamy
2. Cleistogamy
3. Geitonogamy
4. Xenogamy

Which one of the following statements is not true?

1. The flowers pollinated by flies and bats secrete foul odour to attract them.
2. Honey is made by bees by digesting pollen collected from flowers.
3. Pollen grains are rich in nutrients and they are used in the form of tablets and syrups.
4. Pollen grains of some plants cause severe allergies and bronchial afflictions in some people.

Transmission tissue is characteristic feature of

1. dry stigma
2. wet stigma
3. hollow style
4. solid style.

Geitonogamy involves

1. fertilization of a flower by the pollen from another flower of the same plant
2. fertilization of a flower by the pollen from the same flower
3. fertilization of a flower by the pollen from a flower of another plant in the same population
4. fertilization of a flower by the pollen from a flower of another plant belonging to a distant population.

Pollen tablets are available in the market for

1. in vitro fertilization
2. breeding programmes
3. supplementing food
4. ex situ conservation.

Function of filiform apparatus is to

1. recognize the suitable pollen at stigma
2. stimulate division of generative cell
3. produce nectar
4. guide the entry of pollen tube.

Non-albuminous seed is produced in

1. maize
2. castor
3. wheat
4. pea.

Perisperm differs from endosperm in

1. being a diploid tissue
2. its formation by fusion of secondary nucleus with several sperms
3. being a haploid tissue
4. having no reserve food.

Advantage of cleistogamy is

1. no dependence on pollinators
2. vivipary
3. higher genetic variability
4. more vigorous offspring.

Megasporangium is equivalent to

1. nucellus
2. ovule
3. embryo sac
4. fruit.

Which one of the following statements is correct?

1. Endothecium produces the microspores.
2. Tapetum nourishes the developing pollen.
3. Hard outer layer of pollen is called intine.
4. Sporogenous tissue is haploid.

Animal vectors are required for pollination in

1. Vallisneria
2. mulberry
3. cucumber
4. maize.

Albuminous seeds store their reserve food mainly in

1. endosperm
2. cotyledons
3. hypocotyl
4. perisperm.

Megaspores are produced from the megaspore mother cells after

1. mitotic division
2. formation of thick wall
3. differentiation
4. meiotic division.

Which one of the following statements is correct?

1. Cleistogamous flowers are always autogamous.
2. Xenogamy occurs only by wind pollination.
3. Chasmogamous flowers do not open at all.
4. Geitonogamy involves the pollen and stigma of flowers of different plants.

Which of the following statements is correct?

1. Sporopollenin can be degraded by enzymes.
2. Sporopollenin is made up of inorganic materials.
3. Sporopollenin can withstand high temperatures as well as strong acids and alkalis.
4. Sporopollenin can withstand high temperatures but not strong acids.

The viability of seeds is tested by :

1. 2,3,5-triphenyl tetrazolium chloride
2. Safranine
3. 2,6-dichlorophenol indophenol
4. DMSO

What is the function of germ pore?

1. Emergence of radicle
2. Absorption of water for seed germination
3. Initiation of pollen tube
4. Release of male gametes

Which one of the following statements is wrong?

1. When pollen is shed at two-celled stage, double fertilization does not take place.
2. Vegetative cell is larger than generative cell.
3. Pollen grains in some plants remain viable for months.
4. Intine is made up of cellulose and pectin.

Plants with ovaries having only one or a few ovules, are generally pollinated by

1. bees
2. butterflies
3. birds
4. wind

Both, autogamy and geitonogamy are prevented in

1. Papaya
2. cucumber
3. castor
4. maize.

An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is

1. cuticle
2. sporopollenin
3. lignin
4. cellulose.

Even in absence of pollinating agents seed-setting is assured in

1. Commelina
2. Zostera
3. Salvia
4. fig.

In angiosperms, functional megaspore develops into

1. embryo sac
2. ovule
3. endosperm
4. pollen sac.

What is common between vegetative reproduction and apomixis?

1. Both are applicable to only dicot plants
2. Both bypass the flowering phase
3. Both occur round the year
4. Both produce progeny identical to the parent.

Filiform apparatus is a characteristic feature of

1. suspensor
2. egg
3. synergid
4. zygote.