Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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11.

In a moss the sporophyte

  • is partially parasitic on the gametophyte

  • produces gametes that give rise to the gametophyte

  • arises from a spore produced from the gametophyte

  • arises from a spore produced from the gametophyte


A.

is partially parasitic on the gametophyte

In mosses, the sporophyte developing from the embryo is a simple structure without rhizoids and is differentiated into foot, seta ad capsule. It parasitic (partially or wholly) on the gametophyte as it is organically attached and is nutritionally dependent upon the gametophyte.

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12.

People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude of 5400 metres have around 8 million. This is because at high altitude:

  • people get pollution-free air to breathe and more oxygen is available

  • atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive

  • there is more UV radiation which enhances RBC production

  • there is more UV radiation which enhances RBC production

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13.

A major breakthrough in the studies of cells came with the development of electron microscope. This is because

  • the resolution power of the electron microscope is much higher than that of the light microscope

  • the resolving power of the electron microscope is 200 – 350 nm as compared to 0.1 – 0.2 nm for the light microscope

  • electron beam can pass through thick materials, whereas light microscopy requires thin sections

  • electron beam can pass through thick materials, whereas light microscopy requires thin sections

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14.

Which one of the following is a matching set of a phylum and its three examples?

  • Cnidaria — Bonellia, Physalia, Aurelia

  • Platyhelminthes — Planaria, Schistosoma, Enterobius

  • Mollusca — Loligo, Teredo, Octopus

  • Mollusca — Loligo, Teredo, Octopus

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15.

Metameric segmentation is the characteristic of

  • Platyhelminthes and Arthropoda

  • Echinodermata and Annelida

  • Annelida and Arthropoda

  • Annelida and Arthropoda

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16.

What is common about Trypanosoma, Noctiluca, Monocystis and Giardia?

  • These are all unicellular protists

  • They have flagella

  • They produce spores

  • They produce spores

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17.

Which of the following statements regarding cilia is not correct?

  • The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane

  • Cilia are hair-like cellular appendages

  • Microtubules of cilia are composed of tubulin

  • Microtubules of cilia are composed of tubulin

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18.

Which of the following environmental conditions are essential for optimum growth of Mucor on a piece of bread?
A. Temperature of about 25°C
B. Temperature of about 5°C
C. Relative humidity of about 5%
D. Relative humidity of about 95%
E. A shady place
F. A brightly illuminated place

Choose the answer from the following options

  • A, C and E only

  • A, D and E only

  • B, D and E only

  • B, D and E only

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19.

During photorespiration, the oxygen-consuming reaction(s) occur in

  • stroma of chloroplasts and mitochondria

  • stroma of chloroplasts and peroxisomes

  • grana of chloroplasts and peroxisomes

  • grana of chloroplasts and peroxisomes

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20.

Which one of the following not act as a neurotransmitter?

  • Acetylcholine

  • Epinephrine

  • Nor epinephrine

  • Nor epinephrine

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