Tag: phanerogams

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Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

In prothallus of vascular crypogams, antherozoids and eggs mature at different times resulting in

  1. High degree of sterility

  2. Apomixis

  3. Prevention of self fertilisation

  4. No change in success rate of fertilization
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Dichogamy (maturing at different times) in the prothallus of vascular cryptogams prevents self-fertilization, thereby promoting cross-fertilization and genetic diversity.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

A plant with bulb, trimerous flowers, $6$ stamens in two whorls belongs to a specific class in Bentham and Hooker's classification. The number of natural orders present in that class is

  1. $165$
  2. $202$
  3. $3$
  4. $34$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The plant described (bulb, trimerous, 6 stamens) is a monocot (Liliaceae). In Bentham and Hooker's system, the class Monocotyledones contains 34 natural orders.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Trimerous flowers occur in

  1. Monocots

  2. Dicots

  3. Gymnosperms

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

Trimerous flowers are those that have floral parts in the count of three. These flowers are characteristic features of monocots. 

A. Monocots have trimerous florets.
B. Dicots either have tetramerous or pentamerous flowers. 

C. Gymnosperms do not have the flowers. They produce the naked seeds.
Hence, the correct answer is 'Monocots'

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Rolling grass is

  1. Agropyron

  2. Ammophila

  3. Poa

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The grasses, used in the making of lawns are called Rolling grass or Lawn grass. Agropyron, Ammophila, Poa are used in making lawns. So they are called Rolling grass.

So, the correct option is ‘All of the above’.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Wrong statement about angiospperm roots is?

  1. Apex is protected by root cap

  2. Vascular bundles are collateral

  3. Xylem is centripetal in young state

  4. Cuticle is absent in young state
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A. True - In Angiosperms, the root tip is covered by a protective layer called Root cap or Calyptra, to provide protection.

B. False - in the roots, xylem and phloem are present on the different radii. so they are called radial vascular bundles, not collateral vascular bundles.
C. True - in the roots, development of xylem proceeds from periphery to centre.  It is called centripetal development of xylem.
D. True - Roots are not covered externally by cuticle, it is waxy layer.
So, the correct option is ' Vascular bundles are collateral'.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Greatest extent of adaptation to various environments is found in 

  1. Gymnosperms.

  2. Bryophytes.

  3. Ferns.

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

Greatest extent of adaptation to various environments is found in angiosperms. Angiosperms grow on most of the places on earth. They grow in hot and cold deserts. They also grow in high altitude of Himalayas.

Thus, the correct answer is option D. 

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

The giant redwoods of California are the tallest plants reaching a height of 110 m. But which are the longest plants in the world?

  1. Liane

  2. Ressurrection plant

  3. Sorrel

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

Rattan belongs to the palm family (Arecales or Palmea) and is found from sea level up to 3,000 m. Around 600 species and 13 genera of rattan are known. Although most rattan species are native to the tropical regions of Africa, Asia, and Australia, there is a large variety in their distribution.  Commercially-used rattan usually grows in hilly tropical areas, with a mean annual temperature of 25° C and an annual rainfall of -2,000 mm. As a result, the main area for rattan production is in the tropical regions of South and Southeast Asia. There are different types of rattan palms, such as high or low climbers, single stemmed or clustered rattan species. Some have very short and underground stems. Several rattan species are known to reach lengths of 100m. Rattan sheaths have spines for protection, along with ‘whips’ that are also covered with spines. These play a major role in supporting the rattan as it grows over trees and other plants in the rainforest. 

So the correct option is 'Rattan Palm'.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Vessels are found in

  1. All pteridophytes

  2. All angiosperms

  3. Some gymnosperms

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

Vessels are one of the type of water conducting tissue. These cells are long, cylindrical, dead cells. Vessels are absent in pteridophytes. These cells are present in all angiosperms and some gymnosperms. 

Therefore, the correct answer is option D.