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Biology Online Exam Quiz

Important questions about Biology. Biology MCQ questions with answers. Biology exam questions and answers for students and interviews.

1. Ptyalin is an enzyme produced in the

Options

A : salivary glands

B : pituitary glands

C : thyroid glands

D : pancreas

2. One of the following is most suitable for study of mutations

Options

A : Haploids

B : Diploids

C : Tetraploids

D : Polyploid

3. Most highly intelligent mammals are

Options

A : whales

B : dolphins

C : elephants

D : kangaroos

4. Prokaryotic cells lack

Options

A : nucleolus

B : nuclear membrane

C : membrane bound by organelles

D : All of these

5. Organic Substances which, in very small amounts, control growth and development called

Options

A : vitamins

B : hormones

C : enzymes

D : None of the above

6. Phloem is a tissue found in

Options

A : reproductive organs of animals

B : plants

C : insects

D : mammals

7. Night blindness is cause by lack of which vitamin?

Options

A : Vitamin A

B : Vitamin B

C : Vitamin C

D : Vitamin D

8. Plants absorb dissolved nitrates from soil and convert them into

Options

A : free nitrogen

B : urea

C : ammonia

D : proteins

9. Most of the red, blue and purple colours of plants are due to a pigment called

Options

A : anthocyanin

B : carotene

C : chlorophyll

D : xanthophylls

10. Plant bends towards the source of light on account of the movement of curvature known as

Options

A : geotropism

B : thigmotropism

C : chemotropism

D : phototropism

1. Other than spreading malaria, anopheles mosquitoes are also vectors of

Options

A : dengue fever

B : filariasis

C : encephalitis

D : yellow fever

2. Plants absorb most part of water needed by them through their

Options

A : embryonic zone

B : growing point

C : root hairs

D : zone of elongation

3. Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?

Options

A : By cyanobacteria

B : By electrical discharges in the atmosphere

C : By industrially synthesised fertilizer

D : By denitrification

4. Monocot root differs from dicot root in having

Options

A : open vascular bundles

B : scattered vascular bundles

C : well developed pith

D : radially arranged vascular bundles

5. Plants that grow in saline water are called

Options

A : halophytes

B : hydrophytes

C : mesophytes

D : thallophytes

6. Plants wilt due to excess of

Options

A : transpiration

B : photosynthesis

C : absorption

D : None of these

7. O 2 released in the process of photosynthesis comes from

Options

A : CO 2

B : water

C : sugar

D : pyruvic acid

8. Photo-oxidation is

Options

A : photorespiration

B : photolysis

C : light and oxygen induced breakdown

D : All of the above

9. One of the following is not a function of bones.

Options

A : Place for muscle attachment

B : Protection of vital organs

C : Secretion of hormones for calcium regulation in blood and bones

D : Production of blood corpuscles

10. Norepinephrine increases

Options

A : respiration

B : urine production

C : saliva production

D : blood pressure

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