Sexual Reproduction in Flowering Plants

Pollen grain of water pollinated plants are coated by covering to prevent it from wetting.

1. Mucilaginous covering
2. Sporopollenin
3. Lipid layer
4. Protein coat

60% of the angiosperms shed their pollens at the-

1. 2-celled stage
2. 3-celled stage
3. 4-celled stage
4. Single cell stage

Body of ovule fuses with funicle in the region as-

1. Hilum
2. Chalaza
3. Micropyle
4. Funiculus

Germ pore is aperture on exine where-

1. Sporopollenin is absent
2. Sporopollenin is present
3. Pollen tube enters
4. Germination occurs

Tetragonal structure is shape of-

1. Anther
2. Pollen
3. Ovule
4. Ovary

Essential part of flower is-

1. Calyx and Corolla
2. Stamen and pistil
3. Androecium and Calyx
4. Corolla and Gynoecium

Seed dormancy allows the plants to-

1. Overcome favourable climatic conditions
2. Overcome unfavourable climatic conditions
3. Prevent germination in summer
4. Increase germination rate

During germination, micropyle of seeds takes part in-

1. Entry of water and oxygen
2. Entry of pollen tube
3. Both of the above
4. None

In some seeds like black pepper and beet, remnants of nucellus are present. This residual, persistent nucellus is called-

1. Endosperm
2. Perisperm
3. Pericarp
4. Cotyledon

Epicotyl has a shoot apex and a few leaf primordia enclosed in a hollow foliar structure, the ......

1. Coleoptile
2. Coleorhiza
3. Scutellum
4. Plumule

Nuclear or cellular nature of endosperm can be known at a–

1. Free nuclear stage
2. Cellular stage
3. Both stages
4. Mature stage

Endosperm in angiosperms is formed from secondary nucleus–

1. Before fertilization
2. After fertilization but prior to embryogenesis
3. Simultaneously with embryo development
4. After embryo development

The study of formation, growth and development of new individual from an egg is called

1. Embryology
2. Anatomy
3. Histology
4. Physiology

How many and which type of male gametes are produced by the male gametophyte of angiosperm?

1. Three non-motile
2. Three motile
3. Two motile
4. Two non-motile

Product of sexual reproduction generally generates:

1. New genetic variations
2. Identical offspring
3. Clones
4. Haploid offspring

After triple fusion central cell changes into–

1. Embryo
2. Seed
3. Primary endosperm cell
4. Fruit

The sequential order of pollen-pistil interaction events is:

1. (iii) → (i) → (iv) → (ii)
2. (ii) → (iv) → (iii) → (i)
3. (iii) → (iv) → (ii) → (i)
4. (ii) → (iii) → (i) → (iv)

Double fertilisation is

1. Fusion of two male gametes with one egg
2. Fusion of one male gamete with two polar nuclei
3. Fusion of two male gametes of a pollen tube with two different eggs
4. Syngamy and triple fusion

In a fertilised ovule, n, 2n and 3n conditions occur respectively in–

1. Antipodals, zygote, endosperm
2. Megaspore mother cell, nucellus, endosperm
3. Egg, nucellus, microspore
4. Endosperm, micropyle, egg

Which of the following options is correct?

1. Pollination gives the guarantee of the promotion of post-pollination events that lead to fertilisation.
2. The events – from pollen deposition on stigma until pollen tubes enter the ovule – are together referred to as pollen-pistil interaction.
3. Pollen-pistil interaction is a dynamic process involving pollen recognition followed by only promotion (not rejection) of the pollen.
4. Pistil has no ability to recognise the pollen, whether right or wrong type.

The most common type of pollination is–

1. Entomophily
2. Ornithophily
3. Malacophily (by snails)
4. Chiropterophily (by bats)

Which of the following is false about xenogamy?

1. It is the transfer of pollen grains from anther to stigma of another plant of the same species
2. It produces genetic variation
3. It is genetically and ecologically (= functionally) cross pollination
4. It occurs in cleistogamous flowers

Transfer of pollen grains from anther to the stigma of another flower of same plant is–

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

The process whereby a perfect flower is pollinated by its pollen is called

1. Allogamy
2. Autogamy
3. Xenogamy
4. Hydrogamy

Which of the following plants produce(s) chasmogamous and cleistogamous flowers?

1. Viola (Common pansy)
2. Oxalis
3. Commelina
4. All

Pollen grains can be stored in liquid nitrogen at –

1. 70°C
2. 100°C
3. –196°C
4. 0°C

Which of the following is correct about Parthenium (Carrot grass)?

1. Parthenium came into India as a contaminant with imported wheat
2. It has become ubiquitous in occurrence
3. It causes pollen allergy
4. All of the above

Embryo sac is monosporic when it develops from–

1. One of the four megaspores of a megaspore mother cell (MMC)
2. 3 megaspores of a megaspore tetrad
3. 2 megaspores
4. The MMC where meiosis has occurred but cytokinesis does not take place

For the formation of embryo sac, the megaspore mother cell undergoes–

1. Two meiotic and two mitotic divisions
2. One meiotic and three mitotic divisions
3. Two meiotic divisions
4. One meiotic and two mitotic divisions

In angiosperms, microsporogenesis and megasporogenesis

1. Involve meiosis
2. Occur in ovule
3. Occur in anther
4. Form gametes without further divisions.

Apocarpous condition is

1. When there are more than one, the pistils may be free.
2. When there are more than one, the pistils may be fused together.
3. Both (1) and (2)
4. None of the above.

Why G1 and G2 are genetically identical?

1. Because they are products of meiosis one
2. Because they are products of mitosis
3. Because they are products of meiosis
4. Because they are products of amitosis

The placenta is located.......

1. Inside the ovarian cavity.
2. Outside the ovarian cavity.
3. Both of the above.
4. None of the above.

Each cell of sporogenous tissue in anther is–

1. Microspore
2. Pollen
3. Potential pollen or microspore mother cell
4. Megaspore mother cell

As the anthers mature and dehydrate, the _____ separate from each other and develop into–

1. Megaspore, embryo sac
2. Microspores, pollen grains
3. Pollen grains, megaspores
4. Megaspores, microspores

Whorl of stamen is ________

1. Androecium
2. Gynoecium
3. Staminode
4. Anther

Several _____ and _____ changes are initiated which lead to the differentiation and further development of the floral primordium:

1. Hormonal and structural
2. Physiological and Genetic
3. Structural and genetic
4. Hormonal and Genetic

Mark the correct about sporophyte of angiosperm:

1. Haploid
2. Diploid
3. Develop gametes
4. All of these

The proximal part of the filament of stamen is attached to:-

1. Thalamus or the petal
2. Sepals or thalamus
3. Pedicel or petiole
4. Ovary or ovule

Diversity of structure of the inflorescences, flower and floral parts–

1. Are responsible for making our garden beautiful
2. Ensure self-pollination
3. Are adaptations to ensure formation of end products of sexual reproduction
4. Ensure anemophily