Question with Answer Biology

1: Select the correct combination of the statements (A-D) regarding the characteristics of certain organisms.

A. Methanogens are Archaebacteria, wind produce methane in marshy areas.

B. Nostoc is a filamentous blue-green algae which fixes atmospheric nitrogen.

C. Chemosynthetic auto trophic bacteria synthesize cellulose from glucose.

D. Mycoplasma lack a cell wall and can survive without oxygen.

A: B, C

B: A, B, C

C: B, C, D

D: A, B, D

Correct Answer: D

2: Which one of the following is the correct description of a certain part of a normal human skeleton?

A: Parietal bone and the temporal bone of the skull are joined by fibrous joint

B: First vertebra is axis, which articulates with the occipital condyles

C: The 9th and 10th pairs of ribs are called the floating ribs

D: Glenoid cavity is a depression to which the thigh bone articulates

Correct Answer: A

3: Vegetative propagation in Pistia occurs by

A: stolen

B: offset

C: runner

D: sucker

Correct Answer: B

4: The 3’-5' phosphodiester linkages inside a polynucleotide chain serve to join

A: One DNA strand with the other DNA strand

B: One nucleoside with another nucleoside

C: One nucleotide with another nucleotide

D: One nitrogenous base with pentose sugar

Correct Answer: C

5: Identify the components labeled A, B, C in the diagram below from the list 1 to 8 given along with

1. Cristae of mitochondria
2. Inner membrance of mitochondria
3. Cytoplasm
4. Smooth endoplasmic reticulum
5. Rough endoplasmic reticulum
6. Mitochondrial matrix
7. Cell vacuole
8. nucleus

A: 5 4 8 3

B: 1 4 8 6

C: 6 5 4 7

D: 5 1 3 2

Correct Answer: A

6: Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character.

A: The female parent is heterozygous

B: The parents could not have had a normal daughter for this character

C: The trait under study could not be colour blindness

D: The male parent is homozygous dominant

Correct Answer: A

7: Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statement is not correct during the process of nitrogen fixation?

A: Leghaemoglobin scavenges oxygen and is pinkish in colour

B: Nodules act as a site for nitrogen fixation

C: The enzyme nitrogenase catalysis the conversion of atmospheric N2 to NH3

D: Nitrogenase is insensitive to oxygen

Correct Answer: D

8: The figure given below shows the conversion of a substrate into product by an enzyme. In which one of the four options (a-d), the components of reaction labeled as A, B, C and D are identified correctly?

A: Potential Transition Activation Activation energy state energy with energy enzyme without enzyme

B: Transition Potential Activation Activation energy energy energy energy without with enzyme enzyme

C: Potential Transition Activation Activation energy state energy with energy enzyme without enzyme

D: Activation Transition Activation Potential energy state energy energy with without enzyme enzyme

Correct Answer: B

9: Study the cycle shown below and select the option which gives correct words for all the four blanks A, B, C and D.

A: Nitrification Ammonification Animals Plants

B: Denitrification Ammonification Plants Animals

C: Nitrification Denitrification Animals Plants

D: Denitrification Nitrification Plants Animals

Correct Answer: B

10: Study the pathway given below In which the following options, correct words for all the three blanks A, B and C are indicated?

A: Decarboxylation Reduction Regeneration

B: Fixation Transamination Regeneration

C: Fixation Decarboxylation Regeneration

D: Carboxylation Decarboxylation Reduction

Correct Answer: C

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