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Biology (NEST Practice test)

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Which of the following is not a vestigial organ in humans?

  1. Nictitating membrane

  2. Toe nail

  3. Wisdom tooth

  4. Coccyx

  5. Appendix


Correct Option: B
Explanation:

It is the nail present on the toe.

Name the molecule in cells that carries codes from DNA in the nucleus to the sites of protein synthesis in the cytoplasm.

  1. mRNA

  2. rRNA

  3. tRNA

  4. RNA

  5. DNA


Correct Option: A
Explanation:

It is the molecule in cells that carries information from DNA to the sites of protein synthesis in the cytoplasm.

Name the most diverse macromolecule that is found in the cell both physically and chemically.

  1. Proteins

  2. Lipids

  3. Nucleic acid

  4. Carbohydrates

  5. Vitamins


Correct Option: A
Explanation:

They are a class of nitrogenous organic compounds.

Which of the following bacteria is responsible for nitrogen fixation?

  1. Agrobacterium

  2. Cyanobacteria

  3. Rhizobium

  4. Pseudomonas

  5. Anabaena


Correct Option: C
Explanation:

Its role is to fix nitogen in root nodules of leguminous plants.

Which of the following has the largest gametophyte?

  1. Selaginella

  2. Cycad

  3. Angiosperm

  4. Moss

  5. Gymnosperm


Correct Option: D
Explanation:

These are small flowerless plants.

Which of the following is known as friend of farmers?

  1. Mosquito

  2. Earthworm

  3. Frog

  4. Salamander

  5. Ant


Correct Option: B
Explanation:

It is a worm that lives in the soil.

The death of a cell in an organ or tissue due to disease, injury or failure of blood supply is known as

  1. black root rot

  2. chlorosis

  3. gray mould

  4. spotted wilt

  5. necrosis


Correct Option: E
Explanation:

It is the death of most of the cells in an organ or tissue due to disease, injury or failure of blood supply.

Name the last electron acceptor in non-cyclic photophosphorylation.

  1. Cytocrome

  2. Plastocyanin

  3. An iron sulphur-protein

  4. Ferredoxin

  5. None of these


Correct Option: D
Explanation:

It is the last electron acceptor and reduces the enzyme NADP+ reductase.

Soil water avilable to roots is

  1. surface water

  2. hygroscopic water

  3. gravitational water

  4. groundwater

  5. capillary water


Correct Option: E
Explanation:

Water that remains in the soil after gravitational water is drained out.

Which of the following shows anti-insulin effect?

  1. Relaxin

  2. Cortisol

  3. Prolectin

  4. Oxytoxin

  5. Oestrogen


Correct Option: B
Explanation:

It is a glucocorticoid secreted by adernal cortex.

Tri-carboxylic acid cycle occurs in

  1. mitochondria

  2. cytoplasm

  3. chloroplast

  4. ribosome

  5. golgi bodies


Correct Option: A
Explanation:

Krebs cycle occurs in the matrix of mitochondria.

Who gave the theory of pangenesis?

  1. Mendel

  2. Lamarck

  3. Charles Darwin

  4. Pasteur

  5. Weismann


Correct Option: C
Explanation:

He gave the theory of pangenesis.

Who among the following is known as the father of angiosperm embryology in India?

  1. Leeuwenhoek

  2. P. Maheshwari

  3. Noll

  4. Steward

  5. Guignard


Correct Option: B
Explanation:

He is known as the father of angiosperm embryology in India.

Which of the following is used to ripen a fruit?

  1. Abscisic acid

  2. Auxin

  3. Cytokinin

  4. Cuomarin

  5. Ethylene


Correct Option: E
Explanation:

It is an alkane substance that is used to ripen the fruits.

Which of the following is a stress hormone?

  1. Benzyl aminopurine

  2. Dichloro acetic acid

  3. Abscisic acid

  4. Auxin

  5. Oxaloacetic acid


Correct Option: C
Explanation:

It promotes leaf detachment which induces dormancy and inhibits germination.

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