Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The guta of cow and buffalo possess

  • Fucus sp

  • Chlorella sp

  • Methanogens

  • Cyanobacteria


C.

Methanogens

Methanogens are microorganisms taht produces methane as a by product of its metabolism. These are both archeans and obligate anaerobes. They are commonly found in wetlands, where they form marsh gas and in guts of animals such as ruminants and humans, where they are resposible for flatulence(burping)

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2.

Which one gives the most valid and recent explanation for stomatal movements?

  • Transpiration

  • Potassium influx and efflux

  • Starch hydrolysis

  • Guard cell photosynthesis


B.

Potassium influx and efflux

Levitt in 1954 proposed active potassium transport theory, which is the most valid and recent explanation for stomatal movements. It is explained below as:

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3.

Typical growth curve in plants is

  • sigmoid

  • linear

  • Stair-steps shaped

  • parabolic


A.

sigmoid

Sigmoid curve shows the growth in plants. It contains three phases
(i) Lag phase(initial phase)
(ii) Log phase(initial phase)
(iii) Steady phase (stationary phase).



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4.

Typical growth curve in plants is 

  • sigmoid

  • linear

  • stair-steps shaped

  • parabolic


A.

sigmoid

Sigmoid curve shows the growth in plants. It contains three phases:
(i) Lag phase (initial phase)
(ii) Log phase (exponential phase)
(iii) Steady phase (stationary phase)



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5.

In which of the following gametophyte is not independent free-living?

  • Funaria

  • Marchantia

  • Pteris

  • Pinus


D.

Pinus

Gametophyte is phase of life cycle in which the gametes, i.e. egg and sperm are produced. In bryophytes (Funaria and Marchantia) fertilisation is dependent on water for the transfer of sperm to the egg. The gametophyte are fetilized outside the body. Therefore, they have independent free-living gametophyte.

In this respect Pteridophyte are similar to bryophytes i.e they still have free-living gametophytes. Pinaceae (Pinus) has well developed gametophyte in which sperm cells are fertilised with egg cell within the ovule. Hence, pinus is the correct option.

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6.

The chromosomes in which centromere is situated close to one end are

  • metacentric

  • acrocentric

  • telocentric

  • sub-metacentric


B.

acrocentric

Acrocentric chromosome has centrosome, which is situated almost closed to an end. 
There are 4 types of chromosomes according to location of centromere on chromosome (chromatid arms) as
1. Metacentric X-shaped chromosomes with centromere exactly at the middle of two arms
Chromosomes 1 and 3 are metacentric.
2. Acrocentric When one arm is short and centromere is inner to telomere. It is hard to observe short arm but still it is present. 
Chromosome 13, 14, 15, 21 and 22 are acrocentric.
3. Submetacentric: Centromere is sub median, so Arm's length are unequal but observable. Chromosomes 4 and 12 are submetacentric. 
4. Telocentric: When centromere is located at the terminal end of the chromatid arm.
Human do not possess telocentric chromosome.

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7.

Keel is the characteristic feature of flower of

  • Tulip

  • Indigofera

  • Aloe

  • Tomato


B.

Indigofera

Keel is petal is vexillary aestivation, which is a characteristic of family -  Fabaceae, i.e. Indigofera tomato belongs to family - Solanaceae, tulip and while aloe to Liliaceae.

Papilionaceae (e.g. Indigofera, pea) is sub-family of Fabaceae, which has bilateral symmetry with corolla consist of 5 petals. It follows vexillary aestivation. A single upper posterior petal is known as banner.  Two lateral compressed petals called wings and a pair of anterior small fused petal forms keel. Keel has concave sides which make them fused at bases. 


Hence, keel is the characteristic feature of flower of family - Papilionaceae. e.g. Indigofera.

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8.

Select the correct matching in the following pairs

  • Smooth ER — Oxidation of phospholipids

  • Smooth ER — Synthesis of lipids

  • Rough ER — Synthesis of glycogen

  • Rough ER — Oxidation of fatty acids


C.

Rough ER — Synthesis of glycogen

Smooth ER-synthesis of lipids is correct match.
Endoplasmic Reticulum (ER) is a network of tubules and flattened sacs in the cell. It is responsible of manufacturing and packaging system. There are two regions of ER as
(i) Rough Endoplasmic Reticulum (RER) It contains ribosomes on its membrane so it synthesis only proteins and also transfer them wherever these are required.
(ii) Smooth Endoplasmic Reticulum (SER) It is smooth because of lack of ribosomes around its membrane. It is involved in the synthesis and storage of lipids, fats, sterols and glycogen etc. 

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9.

Which one of the following statements is wrong?

  • Algin and carrageenian are products of algae.

  • Agar-agar is obtained from Gelidium and Gracilaria

  • Chlorella and Spirulina are used as space food

  • Mannitol is stored food in Rhodophyceae


D.

Mannitol is stored food in Rhodophyceae

Mannitol is stored food in Phaeophyceae. Red algae are the oldest groups of eukaryotic algae which includes marine algae especially seaweeds. The floridean starch is storage carbohydrate of red algae as grains outside the chloroplast.

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10.

The structures that are formed by stacking of organized flattened membranous sacs in the chloroplasts are

  • cristate

  • grana

  • stroma lamellae

  • stroma


B.

grana

The structures that are formed by stacking of organised flattened membranous sacs (thylakoids) in the chloroplasts are grana. Chloroplasts are organelles found in plant cells that conduct photosynthesis. It is made up of three layers (membranes).
(i) Smooth outer membrane
(ii) Smooth inner (middle) membrane
(iii) Innermost membrane

It has thylakoid system, which is surrounded by the stroma and grana.
Stroma is a alkaline, aqueous fluid which is protein rich.
Grana is formed by stacking of organised flattened membranous sacs called thylakoid.




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