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Multiple choice gymnosperms pictorial feature of plant kingdom biology

The special leaves which bear seeds in conifers and cycads are called as.

  1. Chlorophyll

  2. Sporophyll

  3. Dicot

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

A sporophyll is a leaf that bears sporangia. Both microphylls and megaphylls can be sporophylls. In heterosporous plants, sporophylls (whether they are microphylls and megaphylls) bear either megasporangia and thus are called as megasporophylls, or microsporangia and are called as microsporophylls. The dicotyledons, also known as dicots, were one of the two groups into which all the flowering plants or angiosperms were formerly divided. Chlorophyll is the molecule that absorbs sunlight and uses its energy to synthesise carbohydrates from CO$ _2$ and water. Monocotyledons, more properly referred to as monocots, are flowering plants whose seeds typically contain only one embryonic leaf, or cotyledon. 

Therefore, the correct answer is option B.

Multiple choice gymnosperms pictorial feature of plant kingdom biology

Which of the following is the largest groups of gymnosperms?

  1. Cycads

  2. Gnetinae

  3. Cycadofilicales

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

Conifers are most abundant in cool temperate and boreal regions, where they are important timber trees and ornamentals, but they are most diverse in warmer areas, including tropical mountains. They are the largest group of gymnosperms.
 The largest group of living gymnosperms are the conifers (pines, cypresses and relatives) and the smallest is ginkgo, a single living plant species found in China.
There are around 1000 species of gymnosperm. 

Multiple choice gymnosperms pictorial feature of plant kingdom biology

Cycas is

  1. Monoecious

  2. Bisexual

  3. Dioecious

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

Cycas is dioecious in nature since it produces micro and megaspores in the micro and megasporangia. The micro and megasporangia are born on microsporophyll and megasporophyll respectively.

Multiple choice gymnosperms pictorial feature of plant kingdom biology
Gymnosperms are classified into monocots and dicots

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • The correct answer is 'false'

Monocots and dicots are types of angiosperms and not gymnosperms as the presence of covered seed and cotyledons is a feature of angiosperms only.

Multiple choice gymnosperms pictorial feature of plant kingdom biology

The plant kingdom is comprised of four major divisions (phyla), each of which has evolved to be more complex than the next. Answer the following question using the choices provided. The answer choices may be used once, more than once, or not at all.
This division of the plant kingdom has true vascular tissues and possesses leaves that are often reduced in size which allow them to conserve water. Their gametophyte generation is greatly reduced in size and demonstrates a great difference in size between the male and female gametophyte. This group also possesses woody stems. demonstrating that they have secondary growth. 

  1. Phaeophyta

  2. Angiosperms

  3. Conifers

  4. Pteridophytes (Tracheophytes)

  5. Bryophytes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A. Phaeophyta includes the brown algae that are multicellular organisms having the pigments chlorophyll a and c and fucoxanthin also.
B. Angiosperms are the seed-bearing, flowering vascular plants in which seeds are enclosed in fruits.
C. Conifers are the gymnosperms that are naked seeded plants having a sporophytic plant body which is differentiated into roots, stems, and leaves. Leaves are modified to form needle-like structures to prevent excessive water loss. The stem is woody and shows secondary growth due to the activity of vascular cambium. In conifers, gametophytic generation is highly reduced.
D. Pteridophytes are the seedless vascular plants in which sporophyte represents the dominant phase of a life cycle and the gametophyte is dependent on sporophyte
E. Bryophytes are the simplest and among first land inhabiting plants having two distinct multicellular stages in the life cycle, gametophyte and sporophyte. Gametophytic generation is dominant over a sporophytic generation and the sporophyte is dependent on the gametophyte.
Hence the characteristics given in the question demonstrate that the division is Conifers.
So, the correct answer is 'Conifers'.
Multiple choice gymnosperms pictorial feature of plant kingdom biology

Pick out wrong statement :

  1. Double fertilization is unique to gymnosperms and monocotyledons

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

  3. Phaeophyceae members possess chlorophyll 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.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Sequoia, a gymnosperm, is one of the tallest trees. 
Phaeophyceae members possess chlorophyll a, c carotenoids and xanthophylls.
Moss is a gametophyte which consists of two stages namely, protonema stage and leafy stage.
Double fertilisation is absent in  gymnosperms. It occurs both in monocotyledons and dicotyledons.
So, the correct option is  'Double fertilization is unique to gymnosperms and monocotyledons.'

Multiple choice gymnosperms pictorial feature of plant kingdom biology

Submerged hydrophytes have commonly dissected leaves for

  1. Decreasing surface area

  2. Increasing surface area

  3. Reducing effects of water currents

  4. Increasing number of stomata
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plants with both submerged and floating or emerged leaves show heterophylly (Ranunculus), that is, occurrence of more than one type of leaves or dissected leaves (Hydrilla).This prevents the tearing of the leaves that are constantly exposed to water currents.

So, the correct answer is 'Reducing effects of water currents'

Multiple choice gymnosperms pictorial feature of plant kingdom biology

Sporangia of conifers are located in/on

  1. Axils of leaves

  2. Axils of branches

  3. Dwarf shoots

  4. Scales of the cones
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In conifers, the sporangia (microsporangia and megasporangia) are borne on specialized leaves called sporophylls, which are arranged in cones.

Multiple choice gymnosperms pictorial feature of plant kingdom biology

Which one of the following has not changed for the last several thousand years?

  1. Dryopteris

  2. Gnetum

  3. Ginkgo

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

Ginkgo is widely recognized as a living fossil that has shown little morphological change over geological time.