Tag: botany

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Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Starting with microspore mother cells, what is the least number of meiotic and mitotic divisions needed for the formation of $500$ male gametes in an angiosperm?

  1. $65$ and $500$
  2. $63$ and $252$
  3. $63$ and $500$
  4. $63$ and $504$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In angiosperms, one microspore mother cell undergo meiosis, form into four microspores or pollen grains. Each pollen grain by undergoing two mitotic divisions produces two male gametes. 63 microspore mother cells undergo 63 meiotic divisions and form into 252 microspores or pollen grains. These microspores undergo 500 mitotic divisions and form into 500 male gametes.

So, the correct option is ’63 and 500’. 

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

A seed is

  1. A female gametophyte

  2. A mature pollen tube

  3. A mature ovule

  4. A mature ovary
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When the male nucleus fertilizes the egg cell, the entire ovule is converted into a structure which is known as a seed. The endosperm which is formed after double fertilization or triple fusion nourishes this growing seed.

So, the correct option is 'a mature ovule'

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

How many meiotic divisions are required to produce 250 pollen grains in an angiosperm?

  1. 60

  2. 63

  3. 626

  4. 312
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Each microspore mother cell (MMC) undergoes one meiosis to produce 4 pollen grains. To get 250 pollen grains, we need 250/4 = 62.5 MMCs. Since we cannot have half a division, we need 63 meiotic divisions (62*4 = 248, plus one more division to get the remaining 2).

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Find correct match
Column  I                 Column  II
a.  Sinigrin              (i)  Liliaceae
b.  Carthamin        (ii) Brassicaceae
c.  Atropine          (iii) Solanaceae
d.  Aloin               (v)  Asteraceae

  1. $a(ii),b(iv),c(iii),d(i)$
  2. $a(ii),b(iv),c(i),d(iii)$
  3. $a(i),b(ii),c(iii),d(iv)$
  4. $a(ii),b(ii),c(iv),d(iii)$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sinigrin is a glucosinolate that belongs to the family of glucosides found in some plants of the Brassicaceae family such as Brussels sprouts, broccoli etc. Carthamin is a natural red pigment obtained from safflower oilseed crops belongs to the family Asteraceae. Atropine and vasopressors act to combat bradycardia and hypotension and are derived from the plants that belong to the family Liliaceae.  Aloe vera produces secondary metabolites, such as aloin, which is used in cosmetics and this plant belongs to the family Solanaceae.

So, the correct option is ' a(ii),b(iv),c(i),d(iii)'.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

The plant 'Hibisus' belongs to division _____

  1. Bryophta

  2. Pteridophyta

  3. Gymnosperms

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

A.Bryophyta – chlorophyllous, aquatic, embryophytic, archegoniatic, plants in the plant kingdom. These are also called amphibian of the plant kingdom.

B.Pteridophyta – Chlorophyllous, terrestrial, embryophytic, tracheophytes in the plant kingdom. These are also called vascular cryptogams.

C.Gymnosperms – Naked seeded plants in the plant kingdom.

D.Angiosperms -  Fruit producing plants in the plant kingdom. These are highly advanced plants. Hibiscus is an angiosperm.

So, the correct option is ‘ Angiosperms’.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Consider the following statements:

(a) Plants are divided into five groups: Thallophytes, Bryophytes, Pteridophytes, gymnosperms, and Angiosperms.
(b) Monera is divided into Archaebacteria and Eubacteria.
(c) $Penicillium$ and Yeast both belong to group fungi.

Which of the above statements are correct?

  1. (a) and (b)

  2. (b) and (c)

  3. (a), (b) and (c)

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The first level of classification among plants depends on whether the plant body is well-differentiated or not. The next level of classification is based on whether the differentiated body has special vascular tissues for the transport of water and other substances. Further classification is based on the ability to bear seeds and whether the seeds are naked or enclosed within fruits. 
Monera is a kingdom that contains unicellular organisms with no nuclear membrane, such as bacteria. It can be divided into Archaebacteria and Eubacteria.
A fungus is any member of a large group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. Penicillium and Yeast both belong to group fungi.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

The orchid plants, which are found growing on the trees, are

  1. Parasites

  2. Epiphytes

  3. Saprophytes

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

Different types of epiphytes may grow on the same tree, including orchids. The name 'epiphyte' comes from the Greek word 'epi' meaning 'upon' and 'phyton' meaning 'plant'

So, the correct answer is 'Epiphytes'

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Umbrella plant is

  1. Melia azedarach

  2. Panicum decompositum

  3. Acetabularia

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

Melia azedarach is commonly known as the Persian lilac or umbrella tree due to its canopy shape. The other options refer to different types of plants or algae.

Multiple choice botany plant biology introduction to angiosperms phanerogams angiosperms

Characteristic of series thalamiflorae is

  1. Absence of disc below ovary

  2. Presence of nectariferous disc below ovary

  3. Presence of non-nectariferous disc below ovary

  4. Occurrence of gynophore
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In Bentham and Hooker's classification, the series Thalamiflorae is characterized by flowers having a superior ovary with the stamens inserted on the receptacle (thalamus) below the ovary, meaning there is an absence of a nectariferous disc below the ovary.