Tag: introduction to gymnosperms

Quizzes (0) Questions (20)

Questions Related to introduction to gymnosperms

Multiple choice biology plants in daily life uses of gymnosperms introduction to gymnosperms importance of plants

The leaves of gymnosperms are well-adapted to withstand extremes of temperature, humidity and wind, because of which of the following features?

  1. Needle like leaves

  2. Thick cuticle

  3. Sunken stomata

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Conifers have a number of xerophytic characters such as needle-like (e.g., Pinus), scale-like {e.g., Thuja) or small and leathery leaves {e.g., Araucarias), thick cuticle, sclerenchymatous hypodermis and sunken stomata to reduce transpiration. They are, thus, well adapted to tide over the winter period when the soil becomes frozen and availability of water is very little.

So the correct option is D.

Multiple choice biology plants in daily life uses of gymnosperms introduction to gymnosperms importance of plants

Ephedrine (medicine) is obtained from __A, it is effective medicine in _B_ :-

  1. A : Gnetum, B : Fever

  2. A : Ephedra, B : Asthma

  3. A : Pinus, B : Chilgoza

  4. A : Claviceps , B : Cough
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ephedra is an alkaloid chemical compound traditionally obtained from the plant Ephedra sinica. Ephedrine is a medication and stimulant. It is often used to prevent low blood pressure during spinal anesthesia. It has also been used for asthma, narcolepsy, and obesity but is not the preferred treatment. It is of unclear benefit in nasal congestion.


So, the correct option is 'Option B'.

Multiple choice biology plants in daily life uses of gymnosperms introduction to gymnosperms importance of plants

The  wood produced by gymnosperms is commercially known as

  1. hardwood

  2. sapwood

  3. logwood

  4. softwood
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
 Wood is secondary xylem consisting largely of dead cells involved in the transport of water and minerals as well as support. Plants grow in length because of the elongation of cells produced by terminal (apical) meristem. Most of the cells formed by meristems mature to form epidermis, general matrix tissue (parenchyma), and primary xylem and phloem. In herbaceous plants all of the vascular tissue is produced by apical meristems. In plants that subsequently become woody, a cambium layer forms between the primary xylem and phloem cells. The cambium is a lateral (expanding in width) meristem, capable of dividing to produce additional xylem toward the inside of the stem and additional phloem to the outside. Gymnosperms (softwood) are composed primarily of tracheids, long cells that conduct water primarily through openings in their side walls. Gymnosperms contain fewer kinds of cells than does angiosperm wood, and tends to be comparatively uniform.
So the correct option is 'softwood'.
Multiple choice biology plants in daily life uses of gymnosperms introduction to gymnosperms importance of plants

The giant Redwood tree (Sequoia sempervirens) is a / an _______________.

  1. Angiosperm

  2. Free fern

  3. Pteridophyte

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

Sequoia sempervirens is a gymnosperm. It is the sole living species of genus Sequoia. Its common names include coast redwood, California redwood. It is an evergreen, long-living monoecious tree.

So the correct option is D.

Multiple choice biology plants in daily life uses of gymnosperms introduction to gymnosperms importance of plants

Cedarwood oil is obtained from the heartwood of

  1. Cedrus

  2. Thuja occidentalis

  3. Tagetes

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

The oil obtained from Juniperus virginiana, is cedar wood oil and is used in laboratory for microscopic work. Today, cedar oil is often used for its aromatic properties, especially in aromatherapy. Cedar oil is used as an insect repellent, both directly applied to the skin and as an additive to sprays, candles and other products.

Multiple choice biology plants in daily life uses of gymnosperms introduction to gymnosperms importance of plants

From which of the following plants is a medicine for respiratory disorders obtained?

  1. Bambusa

  2. Sesamum

  3. Ephedra

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

Ephedra (Ephedra sinica) is an herb, that has been used in traditional chinese medicine for more than 5,000 years, primarily to treat asthma or bronchitis. Ephedra is also prescribed for symptoms of cold and flu, including nasal congestion, cough, fever, and chills.

Multiple choice biology plants in daily life uses of gymnosperms introduction to gymnosperms importance of plants

Wood of Cedrus deodara is mainly used for making

  1. Railway sleepers

  2. Match sticks

  3. Pencils

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

Cedrus deodara is a high mountain tree that occurs in a wide range of habitats in the Himalaya. It is also knowns as Deodar and its is in great demand as building material because of its durability, rot-resistant character and good polish taking ability. Thus the correct answer is option A.

Multiple choice biology plants in daily life uses of gymnosperms introduction to gymnosperms importance of plants

Resin got from Pinus is

  1. Hard resin

  2. Mixture of resin and latex

  3. Oleoresin

  4. Gum resin.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Oleoresins are pure extracts of a spice or herb. They are concentrated natural liquid flavourings that contain both volatile and non-volatile flavour components. It is mainly extracted from Pinus. It represents an inestimable and renewable source of terpenes, showing several industrial applications. 
The correct answer is 'Oleoresin'.
Multiple choice biology plants in daily life uses of gymnosperms introduction to gymnosperms importance of plants

Select the correct one from the following

  1. Vascular tissues develop first in amphibian bryophytes

  2. Seed formation start from the pteridophyte plants

  3. Thalloid mycelium and hyphae are common in green algae.

  4. Wood of gymnosperms are durable and resistant to termites attack
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Vascular tissues did not appear in bryophytes. Bryophytes are non-vascular plants. 
  • Pteridophytes do not have seeds. Seed formation, first of all, started from angiospermous plants.
  • Mycelium is the vegetative part of fungus made up of thread-like structures called hyphae.
So, statement numbers 1, 2 and 3 are incorrect.
  • The wood of gymnosperm is durable, and it is also resistant to attack by termites. So, it has a very high economic value.
Thus option D is the correct answer.