Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

In the given table, some organisms are classified into categories. However, there is one exception. Select the option with correctly mentioned exceptional organism.

  • Organisms Category Exception
    Penicillium, Aspergillus, Mucor Fungi Mucor
  • Organisms Category Fungi
    Cacti, Venus flytrap Plants Cacti
  • Organisms Category Exception
    Ascaris, Nereis, Wuchereria Aschelminthes Nereis
  • Organisms Category Exception
    Scorpion, Prawn, Anopheles Arthropoda Prawn

C.

Organisms Category Exception
Ascaris, Nereis, Wuchereria Aschelminthes Nereis

Nereis comes under Phylum- Annelida. It is a unisexual annelid andHeteronereis is the reproductive phase. It is also known as clam worm or sand worm or rag worm. It is usually found on the sea shore in the tubular burrows. Except peristomium and last anal segment, each segment bears laterally one pair of fleshy projections, parapodia which is used in swimming.


12.

Match Column - I with Column - II and select the correct option from the codes given below

Column I Column II
A. Chlorophyta (i)Equisetum
B. Lycopsida (ii)Chara
C. Phaeophyta (iii)Selaginella
D. Sphenopsida (iv)Ectocarpus

  • A - (ii), B - (iii), C - (iv), D - (i)

  • A - (iv), B - (i), C - (ii), D - (iii)

  • A - (ii), B - (iii), C - (i), D - (iv)

  • A - (iv), B - (i), C - (iii), D - (ii)


A.

A - (ii), B - (iii), C - (iv), D - (i)

Chara is a genus of charophyte green algae in the family Characeae. They are multicellular and resemble land plants as they have stem and leaf like structures.

Selaginella is the sole genus of vascular plants in the family Selagginellaceae. It consists of scaled leaves bearing a ligule and by having spores of two types.

Ectocarpus is a genus of filamentous brown alga that is a model organism for the genomics of muticellularity.

Sphenopsida is a class of vascular plants with a fossil. Commonly known as horsetails. Found mainly in wet areas.


13.

Which of the following microbes is correctly paired with its function?

  • Aspergillus niger- Production of lactic acid

  • Trichoderma polysporum- Lowers blood cholesterol

  • Saccharomyces cerevisiae- Production of citric acid

  • Methanogenic bacteria- Gobar gas formation


D.

Methanogenic bacteria- Gobar gas formation

Aspergillus niger carries out fermentation to form citric acid.

Fungus Trichoderma polysporum produces cyclosporin through fermentative activity.

Cyclosporin-A has antifungal, anti-inflammatory and immunosuppressive properties.

Saccharomyces cerevisiae (baker's yeast/brewer's yeast) is used in production of bread/alcohol.

Methanogenic bacteria carry out microbial decomposition of organic matter and aids in gobar gas production.


14.

What is the oxidation state of iron in haemoglobin?

  • Fe-

  • Fe2+

  • Fe3+

  • Fe4+


B.

Fe2+

Red Blood Cells or RBCs contain haemoglobin. It has 4 polypeptide chains and 4 haem groups attached to it or 4 atoms of iron in ferrous form (Fe2+). Thus, it can react with 4 molecules of oxygen to form oxyhaemoglobin.


15.

Which of the following is correctly matched without exception in regard to plant classification?

  • Family - Poaceae - ae

  • Division - Pteridophyta - phyta

  • Class - Bryopsida - sida

  • Genus - Solanum - um


A.

Family - Poaceae - ae

All plant families end with -ae suffix. However, it differs for division, class and genus.


16.

Which of the following is true for excretion in humans?

  • Glucose and amino acids are reabsorbed in PCT by simple diffusion.

  • OCT is impermeable to water.

  • Or an average, 25-30 gm of urea is excreted out per day.

  • Maximum reabsorption occurs in the loop of Henle.


C.

Or an average, 25-30 gm of urea is excreted out per day.

Glucose and amino acids are reabsorbed in PCT by secondary active transport. Water, Sodium (Na) and Chloride ions are reabsorbed in OCT. It is permeable to water. Maximum reabsorption takes place within the PCT. Humans are ureotelic and excrete out 25-30 gm of urea per day.


17.

Which of the following is true for the function disease in family A and B? of labelled parts in the diagram below?

  • A - Blind spot - Image is formed here

  • - Fovea - No visual activity is present

  • C - Cornea - Helps to hold lens in place

  • D - Iris - Visible coloured portion of eye


D.

D - Iris - Visible coloured portion of eye

A- Fovea centralis : Sharpest vision occurs here

B -Blindspot : No image is formed here

C - Ciliary body : It helps to hold the lens in position.

D- Iris : Visible coloured portion of eye.


18.

Which of the following is true for the labelled parts in the figure below?

  • A - Z- line - located at centre of I - band

  • B - Thin filament - occurs in A- band only

  • C - Thick filament - confined to I- band

  • - H- zone - located at centre of M - Line


A.

A - Z- line - located at centre of I - band

A - Z line : located at centre of I- band

B - Thin filament : occurs in both I- band and A- band

C - Thick filament : occurs in A - band

D - H- zone : present at the centre of A- band


19.

Which of the following is the correct floral formula for the floral diagram given below?

  • BrEpi K5 or (5) C5 A()G(2 )

  • K(5) C5 A(5) G (2)

  • % K(5)C1 + 2 + (2) A(9) + 1 G1

  • P3 + 3 or (3 + 3)A 3 + 3 G (3)


C.

% K(5)C1 + 2 + (2) A(9) + 1 G1

The given floral diagram is of family Fabaceae. Flower is bisexual and zygomorphic. It has racemose inflorescence. Calyx has five sepals. Corolla has five petals. Androceium is ten, diadelphous, anther dithecous. Gynoecium has ovary superior, mono carpellary, is unilocular with many ovules. Mainly found in legumes, seeds. These plants are dources of pulses, oils, dye, fibres, fodders etc.


20.

Which of the following gastric secretions is correctly matched with its source?

  • Pepsin - Chief cells

  • Chymotrypsin - Parietal cells

  • HCl - Goblet cells

  • Mucus - Oxyntic cells


A.

Pepsin - Chief cells

Parietal cells (or oxyntic cells) secrete hydrochloric acid (HCl) and Castle's intrinsic factor.

Chief cells (or peptic cells) secrete gastric digestive enzymes as proenzymes such as pepsinogen and prorennin.

HCl helps in converting pepsinogen to pepsin.

Goblet cells secrete mucus which helps to neutralise acid in stomach and protects stomach wall against HCl action.