Tag: gymnosperms

Questions Related to gymnosperms

Angiosperms have dominated the land primarily by their ________________.

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Power of adaptability to diverse habitat

  2. Nature of pollination

  3. Domestication by humans

  4. Large number of seeds

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Correct Option: A

Angiosperms differ from gymnosperms having

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Covered seeds

  2. Large leaves

  3. Seeds

  4. Tap roots.

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Correct Option: A

What is true of angiosperms ?

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Seeds are naked

  2. They have tracheids only

  3. They are not cryptogams

  4. They lack companion cells.

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Correct Option: C

Greatest extent of adaptation to various environments is found in __________.

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Gymnosperms

  2. Bryophytes

  3. Ferns

  4. Angiosperms.

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Correct Option: D
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 (Cactus) and cold deserts. They also grow in high altitude of Himalayas, in water (Hydrilla)  and all types of terrestrial habitat.

So, the correct answer is 'Angiosperms.'

Phloem of angiosperms differs from that of other vascular plants in presence of ______________.

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Vessels

  2. Companion cells

  3. Tylosoldes

  4. Albuminous cells

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Correct Option: B

Endosperm is formed in angiosperms due to double fertilization. It is, however, absent in certain seeds due to lack of ______________.

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Certain enzymes

  2. Growth hormone

  3. Dicotyledonous hormone

  4. Nutrients

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Correct Option: C

Floral features are chiefly used in angiosperms identification because

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Flowers are nice to work with

  2. Flowers have various colour

  3. Flowers can be safely pressed

  4. Reproductive parts are more stable and conservative than vegetative parts

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Correct Option: D

A group of PUC students are appearing for a biology practical examination. One of the practical problems is to identify the slide focused under a microscope. When they observe, they see a structure more or less spherical having an outer most layer which is green in colour and in the middle many of parenchyma cells and a number of skull-shaped bundles are arranged irregularly all around. Help them in identifying the structure properly.

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. It is the transverse section of a dicot stem.

  2. It is the transverse section of a monocot root.

  3. It is the transverse section of a dicot leaf.

  4. Both B and C

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Correct Option: D
Explanation:

Monocots have their vascular bundles arranged in the form of a ring. They have spherical structures when seen in a microscope.  In their outermost layer, there is a presence of chloroplast containing chlorophyll. Both of them have these layers of epidermis, cortex, endodermis, pericycle, vascular tissue, conjunctive tissue, pith. In the middle layer, there are parenchyma cells. Below it, there are skull-shaped bundles of xylem and phloem arranges spherically.

So, option D is the correct answer.

Ploidy of ovum of angiosperms is

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Haploid

  2. Diploid

  3. Triploid

  4. Polyploid

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Correct Option: A
Explanation:

In Angiosperms, the female gametophyte, or megagametophyte, is the embryo sac. Eggs develop in the ovules of the angiosperm flower. Within each ovule is a megaspore mother cell. Each megaspore mother cell undergoes meiosis to produce four haploid megaspores.

Secondary growth is absent in

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Monocotyledons

  2. Dicotyledons

  3. All angiosperms

  4. Gymnsoperms

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Correct Option: A
Explanation:
(A) secondary growth is absent in monocotyledons due to absent of cambium ring between xylem and phloem.
(B) Dicotyledons show secondary growth due to the presence of the cambium ring between xylem and phloem.
(C) Angiosperms include monocot and dicot in which monocot does not show secondary growth due to the absence of cambium ring.
(D)  secondary growth present also in gymnosperms due to the presence of the cambium ring between xylem and phloem.
So, the correct answer is 'Monocotyledons'.