The egg apparatus is made up of two ________ and one ________ at the ________ end of the embryo sac.

  • antipodals, egg cell, micropylar

  • synergids, egg cell, chalazal

  • egg cells, synergids, chalazal

  • synergids, egg cells, micropylar

Consider the following features seen in a plant:

I. Male and female reproductive organs are generally found in separate flowers.

II. The male flowers having a number of long filaments terminating in exposed stamens.

III. The female  flowers having long, feather-like stigmas.

The flowers of this plant would most likely be pollinated by:

  • Wind

  • Water

  • Bees

  • Birds

The cells of which of the following layers of the anther wall are multinucleated due to endomitosis?

  • Epidemis

  • Endothecium

  • Middle layer

  • Tapetum

A typical angiosperm anther is dithecous which means that it is:

  • One lobed and the lobe has two theca

  • Two lobed and each lobe has two theca

  • Two lobed and each lobe has one theca

  • Four lobed and each lobe has two theca

Which of the following layers in the wall of an anther nourishes the developing pollen grains?

  • Tapetum

  • Epidermis

  • Endothecium

  • Middle layers

Pollen intine is made of:

  • Sporopollenin

  • Cellulose and pectin

  • Ergosterol

  • Phospholipids and cholesterol

Pollen grains lose their viability within 30 minutes of their release in:

  • Rose

  • Potato

  • Pea

  • Wheat

The pistil of Papaver is:

  • Monocarpellary

  • Multicarpellary apocarpous

  • Multicarpellary syncarpous

  • Absent

How many of the nuclei in the female gametophyte in angiosperms are surrounded by cell wall?

  • 5

  • 6

  • 7

  • 8

The only type of pollination that brings genetically different types of pollen grains to the stigma is:

  • Chasmogamy

  • Cleistogamy

  • Geitonogamy

  • Xenogamy

Dioecy in plants prevents:

  • Autogamy but not geitonogamy

  • Geitonogamy but not autogamy

  • Both autogamy and geitonogamy

  • Neither autogamy nor geitonogamy

If the female parent produces unisexual flower:

  • Emasculation must be done before maturity

  • Emasculation must be done after maturity

  • Emasculation must be done before pollination

  • Emasculation is not needed

The central cell in the embryo sac, after triple fusion, becomes:

  • Primary endosperm cell

  • Endosperm

  • Embryo

  • Zygote

The endosperm is completely consumed by the developing embryo in all of the following except:

  • Pea

  • Groundnut

  • Beans

  • Castor

Epicotyl has a shoot apex and a few leaf primordial enclosed in a hollow foliar structure called as the:

  • Coleoptile

  • Coleorhiza

  • Scutellum

  • Perisperm

The micropyle remains as a small pore in the seed coat. During germination, this facilitates entry of:

I. Oxygen

II. Water

  • Only I

  • Only II

  • Both I and II

  • Neither I nor II

Why do seeds need water to germinate?

  • Following hydration, enzymes break down stored food and make it available for the embryo.

  • Water provides energy.

  • Water activates the chlorophyll molecules so that photosynthesis can begin.

  • Water dissolves the minerals in the soil so that they become available to the seed.

Genetic self-incompatibility tends to increase

  • pollen dispersal

  • inbreeding

  • pollination

  • outcrossing

If a flower is to be pollinated by moths, it should

  • be heavily scented

  • be shaped like a tulip

  • close about noon

  • be brightly colored

A fertilized embryo sac of an angiosperm contains:

I. Haploid cells

II. Diploid cells

III. Triploid cells

  • I and II only

  • I and II only

  • II and III only

  • I, II and III

The intine of the pollen grain is a:

  • Thick and discontinuous layer made of sporopollenin

  • Thick and continuous layer made of sporopollenin

  • Thin and discontinuous layer made of cellulose and pectin

  • Thin and continuous layer made of cellulose and pectin

In the monosporic embryo sac of a flowering plant, the number of nuclei that get surrounded by cell walls and thus are organized into cells is:

 

  • 5

  • 6

  • 7

  • 8

Female flowers remain submerged in water and the pollen grains are released inside the water in:

  • Sea grasses

  • Vallisneria

  • Water lily

  • Water hyacinth

Scientists are trying to transfer apomictic genes into hybrid varieties of several of our food and vegetable crops so that:

  • They get resistance against common pathogens

  • The yield of these plants can be increased many folds

  • Hybrid seeds need not be produced every year

  • Their germplasm is easily stored in labs for further research

Which of the following is the most common abiotic pollinating agent?

  • Insects

  • Birds and bats

  • Wind

  • Water

The asexual production of seeds is called as:

  • Adventition
  • Fragmentation
  • Self-fertilization
  • Apomixis

The ovule of an angiosperm is technically equivalent to

  • megasporangium

  • megasporophyll

  • megaspore mother cell

  • megaspore

Megasporangium is equivalent to

  • embryo sac

  • fruit

  • nucellus

  • ovule

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

  • Geitonogamy

  • Xenogamy

  • Apogamy

  • Cleistogamy

Flowers, which have single ovule in the ovary and are packed into inflorescence are usually pollinated by

  • water

  • bee

  • wind

  • bat

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