Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

In angiosperms, the chalazal megaspore undergoes mitosis how many times?

  1. Never

  2. Twice

  3. Thrice

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

In angiosperms, the functional megaspore (usually the chalazal one) undergoes three successive rounds of free-nuclear mitotic divisions to form an 8-nucleate, 7-celled embryo sac. Therefore, it undergoes mitosis thrice.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Identify the incorrect statement.

  1. In over $60$ percent of angiosperms, pollen grains all shed at $2$-celled stage
  2. In less than $40$ percent species of angiosperms pollination occurs at $3$-celled stage of pollen grains

  3. Intine of pollen grain is made up of cellulose and pectin

  4. Pollen grains of a few species cause severe allergies and bronchial
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

What are cotyledons?

  1. They are the leaves of embryo.

  2. They are the leaves.

  3. They are the stems of embryo.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cotyledons are the leaves of embryo. Their number is either one or two. Sometimes, they store food materials and become fleshy.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Angiosperms were the first plants to have

  1. Petals

  2. Seed coats to protect seeds

  3. Fleshy fruit

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Angiosperms are the most advanced group of vascular plants. They are commonly called 'Flowering plants'. 
The most important feature in angiosperms is that they exhibit reproductive structures called flowers. The flowers contain certain structures arranged in four whorls. The outer whorls contain accessory structures such as sepals and petals and the two inner whorls containing essential structures such as stamens and carpels.
The stamens represent microsporophylls. Each stamen has an anther and a filament. The anther produces pollen grains containing the highly reduced male gametophyte. The carpels represent megasporophyll. They enclose ovules containing the egg cell which with the associated cells represent the female gametophyte.
A characteristic feature of angiosperms is the occurrence of a phenomenon called double fertilization one male gamete fuses with the egg cell to form a zygote while another male gamete fuses with a diploid secondary nucleus, to form a triploid endosperm (triple fusion). Following pollination and fertilization, the ovule transforms into the seed while the ovary that encloses the ovule transforms into the fruit. Thus, seeds are enclosed in fruits.
Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

.......... is an example of monocot.

  1. Nutmeg

  2. Maize

  3. Cinnamon

  4. Sunflower

  5. Both B and C
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • Monocot plants seeds have one cotyledon. Rice, wheat, maize, bamboo, palm, banana, ginger, onion, garlic, lilies, daffodils, iris, orchids, bluebells, tulips, amaryllis are examples of monocots.
Dicot plants seeds have two cotyledons. Magnolias, nutmeg, cinnamon, avocado, black pepper, water lily, star anise, hornwort are examples of dicots.
Therefore, the correct answer is option B.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

The plants whose seeds have only one cotyledon are called as

  1. Monocots

  2. Dicots

  3. Biennials

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

Angiosperms are also called as flowering plants. Monocots contain a single cotyledon as because the endosperm needed to nourish is not present outside the seed leaf. Therefore, the correct answer is option A.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Sunflower is a 

  1. Dicot

  2. Monocot

  3. Pteridophyte

  4. Nonflowering plant
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sunflower is a dicot plant meaning that it produces two cotyledons. Dicots produce two leaves when they first germinate. The leaves of a dicot vary in shape and size, with the veins extending out from the center. Roots of a dicot are tough and branched. A sunflower seed is a dicot that contains the characteristic double cotyledon. The cotyledon, also known as a seed leaf, holds food reserves for the developing seed. Sunflower is a flowering plant and not a monocot or pteridophyte.

Therefore, the correct answer is option A.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

An example of angiosperm (closed-seeded plant) is

  1. Mango

  2. Cycas

  3. Pinus

  4. Ginkgo

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Angiosperms are the flowering plants. Their seeds develop inside a female reproductive part of the flower, called as the ovary, which usually ripens into a protective fruit. Gymnosperms do not have flowers or ovaries. Their seeds mature inside cones. Seeds may be carried away from the parent plant by wind, water, or animals. Mango is an angiosperm. Cycas, Ginkgo and Pinus are gymnosperms. 

Therefore, the correct answer is option A.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Phanerogamae having vascular tissue and reproductive tissue

  1. Thallophyta

  2. Bryophyta

  3. Phanerogamae

  4. All of above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Thallophyta and bryophyta are cryptogams. They do not have vascular tissue and reproductive tissue, they are non-vascular plants and they reproduce asexually by formation of spores. They are flowering plants and have vascular and reproductive tissue.

So, the correct answer is 'Phanerogamae'.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

The plants whose seeds have two cotyledons are called as

  1. Monocots

  2. Dicots

  3. Biennials

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

Angiosperms are also called as flowering plants. They 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 B.