Biology · Environmental Studies

Plant Reproduction and Germination

892 Questions

Plant reproduction and germination involve seed structure, cotyledon function, and dispersal mechanisms. These core botany concepts frequently appear in general science sections. Practice these questions to ensure better retention.

Seed germination typesSeed dispersal mechanismsCotyledons and albuminous seedsCryptogamic plantsPhanerogams reproduction

Plant Reproduction and Germination Questions

Multiple choice

Male gametes are formed from

  1. generative cell

  2. tube cell

  3. body cell

  4. prothallial cell
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In angiosperms, the pollen grain contains a generative cell and a tube cell. The generative cell undergoes mitosis to produce two male gametes.

Multiple choice

Seed viability is determined by

  1. seed germination test

  2. tetrazolium dye test

  3. triphenyl chloride test

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Seed viability can be assessed through various methods including germination tests and biochemical tests like the tetrazolium dye test (which uses triphenyl tetrazolium chloride).

Multiple choice

Double fertilization refers to fusion of

  1. two polar nuclei

  2. secondary nucleus with male gamete

  3. two eggs

  4. one male gamete with an egg and another with 2 polar nuclei
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Double fertilisation refers to the fusion of one male gamete with an egg and another with 2 polar nuclei.The two central cell maternal nuclei (polar nuclei) that contribute to the endosperm arise by mitosis from the same single meiotic product that gave rise to the egg. The maternal contribution to the genetic constitution of the triploid endosperm is double that of the embryo.

Multiple choice

Seeds whose germination is inhibited by light are called

  1. �vely photophobic

  2. �vely photoblastic

  3. +vely photoblastic

  4. +vely photophobic
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Seeds that require darkness for germination are called negatively photoblastic. The term 'photophobic' is generally not used in this context.

Multiple choice

Pinus has

  1. winged seeds

  2. winged pollen

  3. mycorrhizal roots

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pinus (pine trees) exhibit all these characteristics: winged seeds for wind dispersal, winged pollen grains, and mycorrhizal associations in their roots.

Multiple choice

Pinus seed originates in the

  1. capsule

  2. microsporophyll

  3. microsporangia

  4. megasporophyll
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Seed is the result of fertilization and consequent enlargement of the ovule. Two ovule or megasporangium are present on the adaxial side of ovuliferous scale. The ovuliferous scale and bracts constitute the megasporophyll. There are about 80-90 megasporophylls in a single female cone of Pinus.

Multiple choice

'Seed dresser' is used for

  1. mixing/treating seeds with chemicals (pesticides/fungicides etc.)

  2. sowing seeds at proper distance

  3. producing seeds of high grade

  4. keeping seeds effective upto a longer period
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A seed dresser is a machine or device used to coat seeds with chemicals such as fungicides or pesticides before sowing. This treatment protects the seeds from soil-borne diseases and pests during the early stages of growth.

Multiple choice

Which of the following seeds is a monocot seed?

  1. Gram

  2. Bean seed

  3. Maize

  4. Castor seed
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Monocots or monocotyledons are one of two major groups, of flowering plants, that have one cotyledon (seed-leaf) Examples of monocots of grass family, used for human consumption, is, rice, wheat, corn (maize), rye, barley, teff, millet and other species.

Multiple choice

Which of the following statements is correct?

  1. Lettuce germinates in dark and onion requires light for germination.

  2. Lettuce requires light for germination and onion germinates in dark.

  3. Lettuce and onion require light for germination.

  4. Lettuce and onion germinate in dark.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lettuce requires light for germination and onion germinates in dark.

Multiple choice

The reason for seed dormancy in xanthium is

  1. impermeability of seed coat to water

  2. impermeability of seed coat to oxygen

  3. presence of plant growth inhibitors

  4. rudiment embryo
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Xanthium seeds are impermeable to oxygen as they have very hard seed coat.

Multiple choice

Waxy coating on a bean seed makes it

  1. resistant to pathogens

  2. impermeable to water

  3. feasible for dispersion by animals

  4. capable of epigeal germination
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Waxy coating on the surface of beans makes them impermeable to water.