Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

What do A, B, C and D represent in the following figure?

  • A : carrier protein, B: symport, C: uniport, D : antiport

  • A : carrier protein, B : uniport, C: antiport, D : symport

  • A: carrier protein, B: antiport, C: symport, D : uniport

  • A : carrier protein, B: uniport, C: symport, D : antiport


B.

A : carrier protein, B : uniport, C: antiport, D : symport

Carrier proteins are integral membrane proteins that exist within and span the membrane across which they transport substances.

Uniport is an integral membrane protein that transports a single type of substrate species and moves in a single direction.

An antiport is an integral membrane transport protein that simultaneoulsy transports two different molecules in the opposite direction.

Symport is the movements of two substances that moves in the same direction.


2.

Which of the following is correct?

  • Paneth cells secrete pepsinogen

  • Parietal cells secrete hydrochloric acid

  • Argentaffin cells secrete mucus

  • Chief cells secrete gastrin


B.

Parietal cells secrete hydrochloric acid

Parietal cells are present in the epithelium of the gastric glands. They are large and are presenton the side walls of the glands. They are also called oxyntic cells as they stain strongly with eosin. They secrete hydrochloric acid and Castle intrinsic factor.


3.

Protista differs from monera in having

  • cell wall

  • autotrophic nutrition

  • flagella

  • nuclear membrane


D.

nuclear membrane

All single-celled eukaryotes are placed under protista. Phylogenetically the kingdom protista acts as a connecting link between the prokaryotic kingdom-Monera and the complex multicellular kingdoms- Fungi, Plantae and Animalia.

Protistan cell body has a well defined nucleus and other membrane- bound organelles. It is surrounded by plasmalemma (cell membrane). It consists of cilia and flagella. It has nucleus, nucleolus and nucleoplasm. Monerans lack nuclear membrane.


4.

Who invented electron microscope?

  • Janssen

  • Edison

  • Knoll and Ruska

  • Landsteiner


C.

Knoll and Ruska

The Electron microscope was discovered by Max Knoll and Ernst Ruska at the Berlin Technische Hochschule in 1931. It was the first practical demonstration of the principles of electron microscopy.


5.

Refer the given figures on photoperiodism and select the correct option.

  • A B C
    no correlation between light period and flowering long light- exposure period short light- exposure period
  • A B C
    long light- exposure period no correlation between light period and flowering short light- exposure period
  • A B C
    short light exposure period long light exposure period no correlation between light period and flowering
  • A B C
    no correlation between light period and flowering short light exposure period long light exposure period

C.

A B C
short light exposure period long light exposure period no correlation between light period and flowering

A plant that requires a long period of darkness, is termed as "short day" (long night) plants. The form flowers only when day length is less than about 12 hours.

Long- day plant is a term used to refer to flowers that require long light hours and short darkness hours before blooming. These plants require much less darkness to begin the process of flowering.

A day- neutral plant is a plant that flowers regardless of the amount of light of daylight it receives. Eg. Corn and rice that will bloom whether the day is long or short.


6.

Why are vascular bundles closed in monocots?

  • Xylem and phloem are present.

  • Xylem and phloem occur in separate bundles.

  • Vascular cambium is present between xylem and phloem.

  • Vascular cambium is not present.


D.

Vascular cambium is not present.

The vascular system consists of complex tissues, the phloem and the xylem.

The xylem and phloem together constitute vascular bundles. In dicotyledonous stems, cambium is present between phloem and xylem. Such vascular bundles because of the presence of cambium possess the ability to form secondary xylem and phloem tissues, and hence are called open vascular bundles. In the monocotyledons, the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissues so they are referred to as closed.


7.

Gametophyte and sporophyte are independent of each other in which of the following groups?

  • Pteridophytes

  • Angiosperms

  • Gymnosperms

  • Bryophytes


A.

Pteridophytes

Bryophytes are non vascular terrestrial plants of moist habitats in which a multicellular diploid sporophyte lives as a parasite on an independent multicellular haploid gametophyte that develops multicellular jacketed sex organs. Whereas, in pteridophytes, the main plant body is a sporophyte which is differentiated into true root, stem and leaves and gametophyte is small or inconspicuous, it is usually independent.


8.

What is correct about the movement of substance across the membrane in facilitated diffusion?

  • It is an active transport

  • It doesn't cause transport of molecules from low concentration to high concentration

  • It is insensitive to inhibitors

  • It is a very specific transport


D.

It is a very specific transport

In facilitated diffusion special proteins help move substances across membranes along the concentration gradient without expenditure of energy. It is very specific, it allows cell to select substances for uptake. It is sensitive to inhibitors which react with protein side chains.


9.

Which of the following is correct about the given figure?

  • The length ofthe thick and thin myofilaments has changed.

  • Length of both anisotropic and isotropic band has changed.

  • The myosin cross-bridges move on the surface of actin and the thin and thick myofilaments slide past each other.

  • Length of the sarcomere remains same.


C.

The myosin cross-bridges move on the surface of actin and the thin and thick myofilaments slide past each other.

Myofibrils are composed of smaller structures called myofilaments. These are of two types: Thick filaments and Thin filaments.

1. Thick filaments- composed of myosin proteins, tails of which bind together leaving the heads exposed to the interlaced thin filaments.

2. Thin filaments- composed of actin, tropomyosin band troponin.

The molecular model of contraction which describes the interaction between actin and myosin myofilaments is called the cross- bridge cycle.


10.

Vitamin B6 is also called

  • thiamine

  • pantothenic acid

  • pyridoxine

  • retinol


C.

pyridoxine

Vitamin B6 is known as Pyridoxine. It is widely distributed in cereal grains, yeast, liver, milk etc. It is a constituent of a coenzyme (pyridoxal phosphate) involved in amino acid metabolism. Its deficiency causes retarted growth, dermatitis, convulsions and other symptoms.