Tag: botany

Questions Related to botany

The Sporophyte is the dominant phase in

botany types and parts of plants plant life cycle alternation of generations life span

  1. Pteridophytes

  2. Gymnosperms

  3. Angiosperms

  4. All of these

Show answer
Correct Option: D
Explanation:

The plant body  or the vegetative phase is diploid in pteridophytes, gymnosperms and angiosperms. The reproductive structures like the stobili in pteridophytes, ovules and microsporangium,  anther are also diploid. Here, only the reproductive cells undergo meiosis or gametogenesis to give rise to male and female gametes that are haploid. These fuse to produce a  diploid zygote. So, the gametophytic stage is restricted and of a very short duration as compared to the sporophytic stage. therefore, sporophyte is a dominant phase.

So, the correct answer is 'All of these'

Which of the following has the longest life span?

botany types and parts of plants plant life cycle alternation of generations life span

  1. Banyan tree

  2. Tortoise

  3. Parrot

  4. Elephant

Show answer
Correct Option: A
Explanation:
The period from birth to the natural death of an organism is called its life span. Banyan tree has the longest life span $(200-300\ years)$.

So, the correct answer is A 'Banyan tree'.

Sporophytic generation is represented only by one celled zygote in

botany types and parts of plants plant life cycle alternation of generations life span

  1. Algae

  2. Ferns

  3. Mosses

  4. Liverworts

Show answer
Correct Option: A
Explanation:

Algae are mostly haploid. They show haplontic lifestyle i.e. for the most part of the life haploid is the dominant stage. Fusion of gametes results in diploid sporophyte in algae which undergoes meiosis to form haploid gametophyte. There are no free-living sporophytes. The gametophyte is the dominant phase.

So, the correct option is 'Algae'.

Which of the following is monocarpic plant :-

botany types and parts of plants plant life cycle alternation of generations life span

  1. Shisham

  2. Mango

  3. Pinus

  4. Bamboo

Show answer
Correct Option: D
Explanation:
The term monocarpic was first used by Alphonse de Candolle to refer to the plants that flower, produce seeds and then die. They are also called semelparous. Examples include plants like bamboo, rice, radish, carrot, wheat, etc.
So, the correct answer is 'Bamboo'.

Monocarpic perennial plant is 

botany types and parts of plants plant life cycle alternation of generations life span

  1. Maize

  2. Brassica

  3. Bambusa

  4. Mango

Show answer
Correct Option: C
Explanation:

Monocarpic plants are those plants that flower and fruit only once and then die. They are also called as semelparous plants. Most perennial plants are polycarpic. They flower many seasons in a lifetime. However, certain perennial plants are monocarpic. They flower only once and die after that. However, it can live up to 40 years before it flowers. Example includes Bambusa, Agave.

Thus, the correct answer is 'Bambusa.'

Haploid condition is shown by
I. Spore
II. Sporophyte
III. Gametophyte

botany types and parts of plants plant life cycle alternation of generations life span

  1. I only

  2. II only

  3. I and III

  4. I and II

  5. II and III

Show answer
Correct Option: C
Explanation:

Sporophyte develops by diploid zygote and hence is diploid. Spores are produced on sporophyte by meiosis and hence are haploid. Haploid spores develop mitotically into the haploid multicellular gametophyte. Thus, spores and gametophyte exhibit haploid condition while sporophyte is diploid. 

Therefore, the correct answer is option C.

Isomorphic alternation of generations is found in

botany types and parts of plants plant life cycle alternation of generations life span

  1. Oedogonium

  2. Chara

  3. Ectocarpus

  4. Vaucheria

Show answer
Correct Option: C

A plant living for a few days is

botany types and parts of plants plant life cycle alternation of generations life span

  1. Annual

  2. Ephemeral

  3. Biennial

  4. Perennial

Show answer
Correct Option: B
Explanation:

An ephemeral plant is the one which is marked by short life cycles. An annual plant is a plant that grows for one year whereas biennial and perennial plants are plants that grow for two years and infinite years, respectively.

So the correct option is B.

Identify the correct statement regarding a Monocarpic plant.

botany types and parts of plants plant life cycle alternation of generations life span

  1. Flowers twice in every year

  2. Bears only one type of flower

  3. Flowers once in every year

  4. Dies after flowering once in its life cycle.

Show answer
Correct Option: D
Explanation:

Monocarpic plants are those plants which bear flower once in their life cycle, produce seeds and then die. It means they reproduce once in its life cycle. 

Examples; rice, wheat, radish and carrot.
So, the correct option is 'Option D'.

Match column I with column II and select the correct option from the given codes.

Column I Column II
A. Tallest flower (i) Maize
B. Pronuba moth (ii) Amorphophallus
C. Anemophily (iii) Salvia
D. Entomophily (iv) Yucca
botany flower to flower importance of pollination flower: parts of a flower flower and pollination

  1. A-(ii), B-(iv), C-(i), D-(iii)

  2. A-(ii), B-(iv), C-(iii), D-(i)

  3. A-(iii), B-(ii), C-(i), D-(iv)

  4. A-(iv), B-(iii), C-(ii), D-(i)

Show answer
Correct Option: A
Explanation:

The tallest flower is amorphophallus which is commonly known as Rafflesia flower. It is known to be the largest flower in the world.

Pronuba moth and the plant Yucca have an interdependent relationship regarding the pollination. These are codependent on each other.
Entomophilous flowers are those kinds where pollination is done with the help of insects. The flower that are entomophilous are usually bright in colour to attract the insects. An example is salvia.
Anemophilous flowers are the one ones where the pollination takes place by the wind. The pollen grains are very light and the stigma is sticky and feathery so that they can catch the pollen grains. In maize, the pollination is anemophilous.
So, the correct option is 'A-(ii), B-(iv), C-(i), D-(iii)'