Tag: biology

Questions Related to biology

Which is not true of monocots?

  1. Parallel venation

  2. Single seed leaf

  3. Floral parts in multiples of $4 - 5$

  4. Adventitious roots


Correct Option: C

Which is not a monocot?

  1. Rose

  2. Palm

  3. Orchid

  4. Banana


Correct Option: A

Pick out the wrong statement.

  1. Double fertilization is unique to gymnosperms and monocotyledons

  2. Sequoia, a gymnosperm is one of the tallest trees

  3. Phaeophyceae members possess chlorophylls $a, c$, carotenoids and xanthophylls

  4. Moss is a gametophyte which consists of two stages, namely protonema stage and leafy stage

  5. Evolutionarily, pteridophytes are the first terrestrial plants to possess xylem and phloem


Correct Option: A

Occurrence of triploid $\left(3n\right)$ endosperm is characteristic feature of

  1. Algae

  2. Bryophyte

  3. Gymnosperms

  4. Angiosperms


Correct Option: D

Which is not true about monocots?

  1. Embryo has single cotyledon

  2. Leaves show parallel venation

  3. Flowers are generally trimerous

  4. Vascular bundles are conjoint, collateral and open


Correct Option: D

Consider the following statements with respect to angiosperms.
(a) Male sex organ in a flower is the stamen
(b) Anthers following mitosis produce pollen grains
(c) In an embryo sac, the primary endosperm nucleus (PEN) is diploid
(d) After double fertilization, ovules develop into seeds and ovaries into fruits
Of the above statements

  1. (c) and (d) are correct

  2. (a) and (b) are correct

  3. (a) and (c) are correct

  4. (a) and (d) are correct

  5. (b) and (c) are correct


Correct Option: D

Read the following statements.
(a) Angiosperms range in size from microscopic Wolffia to tall trees of Eucalyptus
(b) In angiosperms, the seeds are enclosed by fruits
(c) Double fertilization is an event unique to angiosperms
(d) In angiosperms, each cell of embryo sac is diploid
(e) In angiosperms, the zygote develops into an endosperm
Of the above statements, the correct ones are

  1. $a, b$ and $d$

  2. $a, b$ and $e$

  3. $a, b$ and $c$

  4. $b, c$ and $d$

  5. $b, c$ and $e$


Correct Option: C

The most diverse group of plants on earth are

  1. Bryophytes

  2. Ferns

  3. Gymnosperms

  4. Angiosperms


Correct Option: D

In grasses, the ligule occurs

  1. At leaf base

  2. Between leaf base and lamina

  3. Between leaf base and petiole

  4. Between petiole and lamina


Correct Option: A
Explanation:

 A ligule is an outgrowth present at the junction of leaf sheath and lamina in grasses. It occurs at the end of petiole at the leaf base. It is a strap-shaped extension of the corolla. It is a membranous appendages.

Thus, the correct answer is 'At leaf base.'

Seed leaf is

  1. Leaf present over the plumule

  2. Colyedon

  3. Coleoptile

  4. Mesocotyl


Correct Option: B
Explanation:

The seed coat encloses an embryo wich is differentiated into radicle (give rise to primary root), plumule(give rise to aerial shoot) and cotyledons (seed leaves). The number of cotyledons may be one or two. These are different from foliage leaves. Some times they store reserve food materials or serve as photosynthetic organs in young seedling. The plumule is surrounded by a conical protective sheath, called coleoptile.

So, the correct answer is 'Cotyledon'.