In a dithecous anther, each pollen sac contains 1000 MMC. What is the total number of pollen-grains produced by the anther?

a. 4,000

b. 8,000

c. 16,000

d. 32,000

Which one of the following statements is correct?

a. Chasmogamous flowers always exhibits geitonogamy.

b. Cleistogamous flowers always exhibits autogamy.

c. Chasmogamous flowers never exhibits autogamy.

d. Cleistogamous flowers exhibits both autogamy and geitonogamy.

If a tetraploid plant contains 48 chromosomes in its nucellus, then number of chromosomes in the egg cell and in a synergid respectively

a. 48 and 48

b. 24 and 24

c. 24 and 48

d. 48 and 24

Pollen grains are generally spherical, measuring about

a. 25-50 micrometres

b. 25-50 millimetres

c. 25-50 nanometres

d. 25-50 centimetres

Which of the following characters is not required for autogamy?

a. Flowers require synchrony in pollen release and stigma maturation

b. Anthers and stigma should lie close to each other

c. Flowers should be bisexual

d. Required pollination agents

Among the following statements related to pollens, choose the correct one.

Statement I: In 40% of angiosperms pollen grains are shed at 3-celled stage.

Statement II: Intine is made of cellulose and pectin and it is discontinuous with germ pores.

a. Both statements I and II are correct

b. Both statements I and II are incorrect

c. Statement I is correct and Statement II is incorrect

d. Statement I is incorrect and Statement Il is correct

When pollen grain is shed at 3-celled stage, name the cells it contains.

a. 1 vegetative cell and 2 male gametes

b. 2 vegetative cells and 1 male gamete

c. 2 generative cells and 1 male gamete

d. 2 male gametes and 1 generative cell

Even in the absence of pollinators, assured seed set will be there in

a. Chasmogamous flowers

b. Geitonogamy

c. Cleistogamous flowers

d. Xenogamy

In some plants, stigma and anther mature at different times because

a. It attracts pollinators

b. It facilitates self-pollination

c. It prevents cross pollination

d. It facilitates cross pollination

Now-a-days agricultural practice is expensive to the farmers as they need to purchase hybrid seeds every year. Which of the following strategies can be employed to overcome this problem?

a. Synthetic seeds

b. Production of Apomictic seeds

c. Conventional plant breeding

d. Parthenocarpy

Identify the correct order of steps involved in artificial hybridization in plants.

a. Artificial pollination → Emasculation → Rebagging → Bagging

b. Rebagging → Artificial pollination → Bagging → Emasculation

c. Emasculation → Bagging → Artificial pollination → Rebagging

d. Bagging → Artificial pollination → Rebagging → Emasculation

Testa and tegmen of the seed coat represent

a. Dried integuments

b. Dried sepals

c. Dried tepals

d. Dried petals

In apple, the chromosome number of gametes is 17. What is the chromosome number in its Primary Endosperm Nucleus (PEN)?

a. 51

b. 34

c. 68

d. 17

During an excavation of soil, pollen fossils were retrieved from deepest layer of soil. The pollen grains remained as fossils because;

a. Pollen grains are asexual reproductive structures

b. The intine of pollen grains is made up of pectin

c. Exine has spiny ornamentation

d. The exine of pollen grains is highly resistant to enzyme action

Identify the mismatch.

a. PEN - Triploid

b. Antipodals - Haploid

c. Zygote - Diploid

d. Synergids - Diploid

Identify the correct order of events in pollen-pistil interaction from the options given below.

I. Release of male gametes into the embryo sac

II. Deposition of pollen grains on stigma

Ill. Entry of pollen tube into embryo sac

IV. Development of pollen tube

V. Entry of pollen tube into the ovule

a. V → IV → III → II → I

b. IV → I → II → I → V

c. I→ IV → V → III → I

d. II → IV → I → V → I

How many microsporangia are located at the corners of a typical bilobed anther of angiosperm?

a. 2

b. 4

c. 8

d. 1

In the given diagram identify the parts labelled as A, B, C and D.

a. A - Coleoptile, B - Scutellum, C - Pericarp, D - Coleorhiza

b. A - Coleoptile, B - Scutellum, C - Coleorhiza, D - Pericarp

c. A - Pericarp, B - Coleorhiza, C - Scutellum, D - Coleoptile

d. A - Coleorhiza, B - Coleoptile, C - Scutellum, D - Pericarp

Consider the following statements and choose the correct answer from the given options.

Statement 1: Innermost layer of microsporangium is tapetum.

Statement 2: Cells of tapetum possess dense cytoplasm more than one nucleus and nourishes developing pollen grains.

a. Both Statements 1 and 2 are incorrect

b. Both Statements 1 and 2 are correct

c. Statement 1 is correct and 2 is incorrect

d. Statement 2 is correct and 1 is incorrect

Identify the correct statement.

a. Only one megaspore present towards chalazal end remains functional

b. 3 megaspores present towards chalazal end degenerate gradually

c. Each megapore mother cell directly develops into a megaspore

d. Each female gametophyte is 7-celled and7-nucleated structure

Which of the following aquatic plant does not show pollination by water?

a. Vallisneria

b. Hydrilla

c. Water hyacinth.

d. Zostera

Which cell of the female gametophyte is involved in the formation of primary endosperm nucleus (PEN) after fertilisation?

a. Antipodals

b. Egg cell

c. Synergids

d. Central cell

Stalk of the stamen is

a. Petiole

b. Filament

c. Penducle

d. Pedicel

The ovule of angiosperm is technically known as

a. Megapore mother cell

b. Megasporangium

c. Megaspore

d. Megasporophyll

Typical mature embryo sac of angiosperm is

a. 7 nucleated, 8 celled structure

b. 8 nucleated, 8 celled structure

c. 8 nucleated, 1 celled structure

d. 8 nucleated, 7 celled structure

One of the 2000 year old viable seed, discovered during the archeological excavation at King Herold's near dead sea.

a. Maize

b. Sunflower

c. Lupin

d. Phoenix dactyliffera