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Plant Kingdom · Question 62

AIPMT 2011 (Mains)MCQEasy📈 Topic in 50% papers+4−1
1

Selaginella and Salvinia are considered to represent a significant step toward evolution of seed habit because

  1. female gametophyte is free and gets dispersed like seeds.
  2. female gametophyte lacks archegonia.
  3. megaspores possess endosperm and embryo surrounded by seed coat.
  4. embryo develops in female gametophyte which is retained on parent sporophyte.

Answer

(4) embryo develops in female gametophyte which is retained on parent sporophyte.

Solution

As per NCERT, Selaginella and Salvinia are heterosporous pteridophytes producing microspores and megaspores.

∵ The megaspores germinate into female gametophytes which are retained on the parent sporophyte for variable periods,

⇒ the zygote develops into a young embryo within the female gametophyte.

∴ This event is a precursor to the seed habit – an important step in evolution.

Answer: (4)

AIPMT 2011 (Mains)

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2

Consider the following four statements whether they are correct or wrong. The two wrong statements together are

  1. A and C
  2. A and D
  3. B and C
  4. A and B.
AIPMT 2011 (Mains)
3

Examine the figure given below and select the correct option giving all the four parts (A, B, C and D) rightly identified. [Figure]

  1. (A) Archegoniophore (B) Female thallus (C) Gemma cup (D) Rhizoids
  2. (A) Antheridiophore (B) Male thallus (C) Globule (D) Roots
  3. (A) Archegoniophore (B) Female thallus (C) Bud (D) Foot
  4. (A) Seta (B) Sporophyte (C) Protonema (D) Rhizoids
AIPMT 2011 (Mains)
4

The gametophyte is not an independent, free-living generation in

  1. Polytrichum
  2. Adiantum
  3. Marchantia
  4. Pinus
AIPMT 2011 (Prelims)
5

Compared with the gametophytes of the bryophytes, the gametophytes of vascular plants tend to be

  1. smaller but to have larger sex organs
  2. larger but to have smaller sex organs
  3. larger and to have larger sex organs
  4. smaller and to have smaller sex organs
AIPMT 2011 (Prelims)
6

Archegoniophore is present in

  1. Marchantia
  2. Chara
  3. Adiantum
  4. Funaria
AIPMT 2011 (Prelims)
7

A prokaryotic autotrophic nitrogen fixing symbiont is found in

  1. Alnus
  2. Cycas
  3. Cicer
  4. Pisum
AIPMT 2011 (Prelims)
8

Examine the figures A, B, C and D. In which one of the four options all the items A, B, C and D are correct? [Figure]

  1. (A) Funaria, (B) Adiantum, (C) Salvinia, (D) Riccia
  2. (A) Equisetum, (B) Ginkgo, (C) Selaginella, (D) Lycopodium
  3. (A) Chara, (B) Marchantia, (C) Fucus, (D) Pinus
  4. (A) Selaginella, (B) Equisetum, (C) Salvinia, (D) Ginkgo
AIPMT 2010 (Mains)
9

Examine the figures (A–D) given below and select the right option, in which all the four structures A, B, C and D are identified correctly. [Figure]

  1. A Offset, B Antheridiophore, C Antipodals, D Oogonium
  2. A Rhizome, B Sporangiophore, C Polar cell, D Globule
  3. A Sucker, B Seta, C Megaspore mother cell, D Gemma cup
  4. A Runner, B Archegoniophore, C Synergid, D Antheridium
AIPMT 2010 (Mains)
10

Male and female gametophytes are independent and free-living in

  1. mustard
  2. castor
  3. Pinus
  4. Sphagnum
AIPMT 2010 (Prelims)
11

Phylogenetic system of classification is based on

  1. morphological features
  2. chemical constituents
  3. floral characters
  4. evolutionary relationships
AIPMT 2009

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