Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

In China rose the flowers are

  • actinomorphic, hypogynous with twisted aestivation

  • actinomorphic, epigynous with valvate aestivation

  • zygomorphic, hypogynous with imbricate aestivation

  • zygomorphic, epigynous with twisted aestivation


A.

actinomorphic, hypogynous with twisted aestivation

Actinomorphic  (star-shaped) can be divided into 3 or more identical sectors, which are related to each other by rotation about the centre of the flower, e.g., china rose. Zygomorphic flowers can be divided by only a single plane into two mirror-image halves., e.g., orchids.
Valvate aestivation: The sepals or petals in whorl just touch one another at the margin, e.g., Calotropis.
Twisted aestivation: One margin of the appendage overlaps that of the next one, e.g., china rose. Imbricate aestivation the margins of sepals or petals overlap but not necessarily in a specific direction. e.g cassia.

1469 Views

2.

Lenticels are involved in

  • Transpiration

  • Gaseous exchange

  • Food transport

  • Photosynthesis


B.

Gaseous exchange

Plants have stomata and Lenticles involved in gaseous exchange. In stems, the living cells are organised in thin layers inside and beneath the bark. They have openings called Lenticles.

1088 Views

3.

Select the wrong statement

  • Isogametes are similar in structure, function and behaviour

  • Anisogamets differ either in structure, function and behaviour

  • In oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile

  • Chlamydomonas exhibits both isogamy and anisogamy and fucus shows oogamy


C.

In oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile

Oomycetes (egg fungus) include water moulds, white rusts and downy mildews. In these, white rusts and downy mildews. In these, female gamete is smaller and motile, whereas male gamete is larger and non-motile. 
Isogametes are found in algae like Ulothrix, Chlamydomonas, Spirogyra etc., which are similar in structure, function and behaviour. 
Anisogametes are found in Chlamydomonas in which one gamete is larger and non-motile and the other one is motile and smaller.
Oogamy is the fusion of non-motile egg with motile sperm. The gametes differ both morphologically as well as physiologically. It occurs in Chlamydomonas, Fucus Chara, Volvox, etc

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4.

Isogamous condition with non-flagellated gametes is found in

  • Chlamydomonas

  • Spirogyra

  • Volvox

  • Fucus


B.

Spirogyra

Isogamy is found in Spirogyra in which both gametes are non-motile.In Chlamydomonas, all three conditions, isogamy anisogamy and oogamy are found.Both motile and non-motile gametes are found. In volvox and Fucus, oogamy is present, where non-motile egg fuses with motile sperm.

2031 Views

5.

Besides paddy fields, cyanobacteria are also found inside vegetative part of

  • Pinus

  • Cycas

  • Equisetum

  • Psilotum


B.

Cycas

Cyanobacteria within the coralloid roots of Cycas are chemoheterotrophic and specifically adapted to life in symbiosis. Only a few species of cyanobacteria form associations with Cycas. Pinus is gymnosperm.Equisetum belongs to vascular plants and to horse tail family.Psilotum belongs to division -Pteridophyta and is a fern like a plant.

1310 Views

6.

Among bitter gourd mustard, brinjal, pumpkin, China rose, lupin, cucumber, sunn hemp, gram, guava, bean, chilli, plum, Petunia, potato tomato, rose, With potato, onion, aloe and tulip, how many plants have hypogynous flower?

  • Six

  • Ten

  • Fifteen

  • Eighteen


C.

Fifteen

 

Flowers

 

Hypogynous

Perigynous

Epigynous

Gynoecium present above all the floral parts

Ovary is superior

Gynocecium present in the centre.

Other part almost at same level.

Ovary half inferior, e.g., Plum,rose

Ovary enclosed by thalamus and gets fused with it

Other parts above ovary

Ovary inferior e.g., Guava, cucumber.

Pulm, rose are perigynous and guava, cucumber are epigynous. So, total remaining plants are hypogynous.

2962 Views

7.

Interfascicular cambium develops from the cells of

  • medullary rays

  • xylem parenchyma

  • endodermis

  • pericycle


A.

medullary rays

In dicot stems, the cells of cambium present between primary xylem and primary phloem are the intrafasicular cambium. The cells of medullary rays, adjoining these intrafascicular cambium become meristematic and form the interfascicular cambium. Xylem parenchyma is living and thin-walled and their cell walls are made up of cellulose. In dicot roots, the innermost layer of the cortex is called endodermis. Next to endodermis lies a few layers of thin-walled parenchymatous cells called as pericycle.

1775 Views

8.

Seed coat is not thin, membranous in

  • maize

  • coconut

  • groundnut

  • gram


B.

coconut

The seed coat is thick in coconut seed and thin, membranous in groundnut, gram and maize seeds.

1631 Views

9.

Which one of the following is not correct statement?

  • Herbarium houses dried, pressed and preserved plant specimens.

  • Botanical gardens have collection of living plants for reference

  • A museum has collection of photographs of plants and animals

  • Key is a taxonomic aid for identification of specimens


C.

A museum has collection of photographs of plants and animals

Museums have a collection of preserved plants and animal specimens for study and reference specimens are preserved in the containers in preservative solutions.
Herbarium is a store house at collected plant specimens that are dried, pressed and preserved on sheets.
Botanical gardens have a collection of living plants for reference.
The key is a taxonomic aid for identification of plants and animals based on the similarities and dissimilarities.

1391 Views

10.

Transition state structure of the substrate formed during an enzymatic reaction is

  • transient but stable

  • permanent but unstable

  • transient and unstable

  • permanent and stable


C.

transient and unstable

The substrate binds to the enzyme at its active site forming an enzyme-substrate complex. This complex formation is a transient and unstable phenomenon. very soon, the product is released from the active site. It is the fact that all other intermediate structural states are unstable. Stability is related to energy status of the molecule or the structure.

1427 Views