NEET and AIPMT NEET Botany Plant Kingdom MCQ Questions Solved


The pyrenoids are made up of                                        [1995]

(a) Proteinaceous centre and starchy sheath

(b) Core of protein surrounded by fatty sheath

(c) Core of starch surrounded by sheath of protein

(d) Core of nucleic acid surrounded by protein sheath 

(a) Pyrenoids consist of dense proteinaceous area surrounded by starchy sheath. These are unique to chloroplast of algae and are associated in polymerising sugars into reserve polymers (starch). 

Difficulty Level:

  • 46%
  • 19%
  • 28%
  • 9%

Consider the following features:

I. Chlorophyll a and Chlorophyll c

II. Fucoxanthin

III. Floridean starch

IV. Flagella 2 in number, unequal and lateral

Which of these are seen in Phaeophyceae?

(1) I, II, III

(2) I, II, IV

(3) II, III, IV

(4) I, II, III, IV

(2) Floridean starch is the stored food in red algae.

Difficulty Level:

  • 17%
  • 55%
  • 12%
  • 18%

The endosperm of a gymnosperm develops _______ fertilization, whereas the endosperm of an angiosperm develops _________ fertilization.

(1) before, before

(2) after, after

(3) after, before

(4) before, after

(4) The endopserm in gymnosperms is formed during the germination of the megaspore and contains a haploid [n] set of chromosomes.

Difficulty Level:

  • 8%
  • 16%
  • 18%
  • 60%

In Pinus,

I. The stem is branched

II. Roots have fungal association in the form of mycorrhiza

III. The male and female strobili are borne on different trees

Of the above statements:

(1) Only I is correct

(2) Only II is correct

(3) Only I and II are correct

(4) I, II and III are correct

(3) Pines are monoecious i.e., the male or female strobili are borne on the same tree (Pinus).

Difficulty Level:

  • 13%
  • 18%
  • 46%
  • 26%

Match each term with its definition and choose your answer from the codes given:

I.

Isogamy

1.

The union of two gametes

II.

Syngamy

2.

Two gametes, one larger than the other

III. 

Heterogamy  

3.  

Two kinds of gametes, one motile and other non motile

IV.

Anisogamy

4.

Two kinds of morphologically distinct gametes

V.

Oogamy

5.

Both gametes morphologically indistinguishable

Codes:

 

I  

II

III

IV

V

(1)   

1     

2     

3     

4     

5

(2)

4

1

2

3

4

(3)

5

1

2

4

3

(4)  

3

1

2

4

5

 

(3) Factual

Difficulty Level:

  • 10%
  • 20%
  • 65%
  • 8%

Identify the incorrectly matched pair:

(1)  

Chlamydomanas:  

Microscopic unicellular algae

(2)

Volvox:

Colonial algae

(3)

Ulothrix:

Filamentous algae

(4)

Fucus:

Isogamous algae

(4) Fucus is oogamous.

Difficulty Level:

  • 10%
  • 9%
  • 12%
  • 71%

Identify the incorrect statement regarding algae:

(1) At least a half of the total carbon dioxide fixation on earth is carried out by algae through photosynthesis.

(2) Around 70 species of freshwater algae can be used as food.

(3) Certain marine brown and red agae produce large amounts of hydrocolloids (water holding substances), e.g., algin (brown algae) and carrageen (red algae) which are used commercially.

(4) Agar, obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies.

(2) Around 70 species of MARINE algae are used as food.

Difficulty Level:

  • 15%
  • 61%
  • 17%
  • 9%

What is not true for red algae?

(1) Lack centriole and flagella

(2) Accessory pigments include phycocyanin, phycoeythrin and allophycocyanin

(3) They reproduce using alternation of generation

(4) The stored food is floridean starch very similar to cellulose

(4) Floridean starch is very similar to amylopectin and glycogen in structure.

Difficulty Level:

  • 20%
  • 18%
  • 32%
  • 33%

Identify the incorrect statement reagrding green algae?

(1) They contain chl a, chl b as well as carotenoids.

(2) The chloroplasts may be discoid, plate-like, reticulate, cup-shaped, spiral or ribbon-shaped in different species.

(3) Most members have one or more storage bodies called pyrenoids located outside the chloroplasts.

(4) They usually have a rigid cell wall made of an inner layer of cellulose and an outer layer of pectose.

(3) Pyrenoids are located in the chloroplast.

Difficulty Level:

  • 20%
  • 9%
  • 58%
  • 15%

Consider the following statements regarding brown algae:

I. The pigments are chl a, c and xanthophylls, fucoxanthin

II. Storage food is laminarin and mannitol 

III. The cellulosic cell wall is covered with algin

IV. They have a centrally located vacuole

V. Their photosynthetic organs are called as fronds - leaf like structures

VI. They have pear shaped biflagellate zoospores

VII. They have two unequal laterally attached flagella.

The number of correct statements is

(1) 5

(2) 6

(3) 7

(4) 4

(4) Factual, read NCERT.

Difficulty Level:

  • 15%
  • 34%
  • 43%
  • 10%