Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Angiosperms are classified into 

  1. Phanerogams and cryptogams

  2. Thallophytes and bryophytes

  3. Monocots and dicots

  4. Vertebrates and invertebrates
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Angiosperms are also called as flowering plants that are classified based on characteristics that include cotyledon structure, pollen grains, as well as flower and vascular tissue arrangement. Basal angiosperms, classified separately, contain features found in both monocots and dicots, as they are believed to have originated before the separation of these two main groups. Monocots contain a single cotyledon and have veins that run parallel to the length of their leaves; their flowers are arranged in three to six-fold symmetry. Dicots have flowers arranged in whorls, two cotyledons, and a vein arrangement that forms networks within their leaves. 

Therefore, the correct answer is option C.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Maize is a __________.

  1. Dicotyledonous plant

  2. Monocotyledonous plant

  3. Crytogamae

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

Angiosperm are subdivided into two classes which are cotyledons and dicotyledons depending on the number of cotyledons in their embryo. Maize has just one cotyledon in its embryo.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Angiosperms are subdivided into two classes which are cotyledons and dicotyledons.

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Phanerogamae are the sub-kingdom of kingdom Plantae. They include seed bearing and flowering plants. They are further grouped into angiosperms and gymnosperms. Angiosperms are subdivided into two classes which are cotyledons and dicotyledons depending on the number of cotyledons in their embryo.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

What is true of angiosperms?

  1. Seeds are naked

  2. They have tracheids only

  3. They are not cryptogams

  4. They lack companion cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Angiosperms are flowering plants and are not cryptogams (which are non-flowering plants like algae, mosses, and ferns). They have seeds enclosed in fruits, possess vessel elements, and have companion cells.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Endosperm cell of an angiosperm has $24$ chromosomes. The number of chromosomes in the gametes would be.

  1. $8$
  2. $16$
  3. $24$
  4. $48$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The endosperm in angiosperms is triploid (3n). If 3n = 24, then n = 8. Gametes are haploid (n), so they contain 8 chromosomes.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

In angiosperms, a mature male gametophyte is formed from a pollen mother cell through.

  1. Two meiotic divisions

  2. Three mitotic divisions

  3. One meiotic and two mitotic division

  4. A single meiotic division
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Meiosis produces pollen grain. Its cell divides mitotically to form generative nucleus and tube cell. The generative nucleus undergoes another mitosis to form two male gametes.

So, the correct answer is 'One meiotic and two mitotic division'

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

In angiosperms, formation of two male gametes from a pollen grain involves - divisions.

  1. One mitotic and one mitotic

  2. Two meiotic and two mitotic

  3. Only two mitotic

  4. Only two meiotic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The microspore nucleus undergoes one mitotic division to form the vegetative and generative cells. The generative cell then undergoes a second mitotic division to produce two male gametes. Thus, two mitotic divisions occur.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

A natural sequence of developmental stages in the life cycle of an angiosperm is?

  1. Cleavage $\rightarrow$ Fertilization $\rightarrow$ Differentiation $\rightarrow$ Fruit formation
  2. Pollination $\rightarrow$ Fertilization $\rightarrow$ Seed formation $\rightarrow$ Germination
  3. Germination $\rightarrow$ Double fertilization $\rightarrow$ Endosperm formation $\rightarrow$ Seed dispersal
  4. Maturation $\rightarrow$ Mitosis $\rightarrow$ Differentiation $\rightarrow$ Fertilization
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The standard sequence in the angiosperm life cycle is pollination, followed by fertilization, which leads to seed formation, and finally germination of the seed.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Centrospermae is regarded a natural order of angiosperms. All except two of its families contain the pigments that are collectively called battalions. Some of the families of the order are enumerated below. Which two families lack betalains?
a. Amaranthaceae
b. Aizoaceae
c. Chenopodiaceae
d. Caryophyllaceae
e. Mouginaceae
Select the correct answer using the codes given.

  1. $1$ and $2$
  2. $2$ and $3$
  3. $3$ and $4$
  4. $4$ and $5$
Reveal answer Fill a bubble to check yourself
D Correct answer