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Home » Biology MCQs (Multiple Choice Questions) – Part #1

Biology MCQs (Multiple Choice Questions) – Part #1

This is the Part #1 of our Biology MCQs section. There are few other parts and each one contain 40 Biology MCQs. You can answer first and check your answers at the end of the page.

1. Which one of the following is a characteristic of dicotyledonous plants?

  1. Non-branched stems
  2. Parallel veins
  3. Fibrous root system
  4. Flowers with 5 petals or multiples of 5

2. Tortoises and crocodiles belong to which group?

  1. Pisces
  2. Reptiles
  3. Annelida
  4. Amphibians

3. Microorganisms which have a simpler body structure. They can only reproduce inside another living cell.

  1. Protozoa
  2. Fungi
  3. Bacteria
  4. Virus

4. Animals that have a segmented body with a pair of appendages in each body segment and a body covered by a firm exoskeleton is,

  1. Coelentarates
  2. Mollusca
  3. Annelida
  4. Arthropods

5. The plants that reproduce seeds which are not enclosed in a fruit are,

  1. Fungi
  2. Conifers
  3. Mosses
  4. Ferns

6. Muscles which are involuntary are,

  1. Smooth muscles & Skeletal muscles
  2. Cardiac muscles & Skeletal muscles
  3. Unstriated muscles & Skeletal muscles
  4. Smooth muscles & Cardiac muscles

7. Algae are said to be autotrophic because they,

  1. Prepare their own food
  2. Are unicellular
  3. Live in water
  4. Are made up of filaments

8. In a systole of ventricles,

  1. The semilunar valves close
  2. The ventricular muscles relax
  3. The tricuspid and bicuspid valves open
  4. Blood flows into the 2 main arteries

9. Unstriated muscles can be found in

  1. Heart
  2. Intestinal wall
  3. Trachea
  4. Biceps and upper arm

10. When foods containing fiber are consumed, it can prevent,

  1. Gall stones
  2. Constipation
  3. Amoebisis
  4. Gastritis

11. Which one of the following is not exactly an excretory product?

  1. Faeces
  2. Sweat
  3. Urine
  4. Carbon dioxide

12. Myocarditis is a disease,

  1. Of the kidney caused by a virus
  2. Of the heart caused by a thrombosis
  3. Of the kidney caused by a bacterium
  4. Of the heart caused by a virus

13. The BCG vaccine is given to infants to prevent,

  1. Phneumonia
  2. Myocarditis
  3. Bronchitis
  4. Tuberculosis

14. Animals that live in both aquatic and land environments and possess webbed feet are able to swim in water and hop on land, belong to the group,

  1. Arthropods
  2. Pisces
  3. Mammals
  4. Amphibians

15. The part of a cell in which the reactions that supply energy for vital activities take place is the,

  1. Chloroplast
  2. Golgibody
  3. Ribosomes
  4. Mitochondria

16. The part of the plant which carries genetic materials required for reproduction is the,

  1. Stem
  2. Roots
  3. Androecium
  4. Leaf

17. Muscles of the heart are,

  1. Striated & Voluntary
  2. Unstriated & Involuntary
  3. Unstriated & Voluntary
  4. Striated & Involunatry

18. In testing of a leaf for starch, at one stage the leaves are boiled in alcohol. The purpose of it is,

  1. To remove starch
  2. To remove chlorophyll
  3. To destroy cell walls
  4. To enable us to see starch

19. Which one is an example for biochemical catalyst?

  1. Nickel
  2. Methane
  3. Iron
  4. Lipase

20. The rate of transpiration in plants decrease with an increase in,

  1. Speed of wind
  2. Intensity of light
  3. Humidity of air
  4. Temperature of enviornment

21. Which one of the following is an example for In Situ conservation?

  1. Coral reefs
  2. Botanical gardens
  3. Elephant orphanage
  4. Turtle breeding centers

22. Most unlikely effect of depletion of Ozone layer is,

  1. Skin cancers
  2. Genetic disorder in organisms
  3. Acid rains
  4. Reduction of bio diversity

23. What is the correct sequence of following endocrine gland its hormone?

  1. Adrenal gland – Insulin
  2. Pancreas – Panereatic juice
  3. Thyroid gland – Adrenaline
  4. Pituitary gland – FSH

24. The part of the brain that controls the respiratory movements,

  1. Medulla Oblongata
  2. Midbrain
  3. Cerebrum
  4. Cerebellum

25. Style is part of a flower that belongs to the,

  1. Androecium
  2. Gynoecium
  3. Stamen
  4. Receptacle

26. Consider following 2 statements, a) Decomposers bring about the decay of dead organic matter. b) Addition of compost to soil destroys decomposers.

  1. Statements A and B are both correct
  2. Statements A is correct B is wrong
  3. Statements A and B both are wrong
  4. Statements B is correct and A is wrong

27. Biotechnology has become very useful to farmers. Out of the following which one can be considered as a Biofertilizer introduced due to modern technology?

  1. Introducing denitrifying bacteria to agricultural lands
  2. Introducing artificially made fertilizers to agricultural lands
  3. Planting leguminous plants which have root nodules contacting bacteria in agricultural lands
  4. Introducing genetically improved nitrogen fixing bacteria to agricultural lands.

28. A student had gathered some seeds, which show the following characteristics,
a) There is an embryo inside the seed
b) Seeds are found in cones
c) The seed is not enclosed in a fruit

The seeds belong to a plant in the group

  1. Monocotyledonons
  2. Angisperms
  3. Gymnosperms
  4. Bryophyta

29. The microorganisms that do not perform vital activities unless inside another living cell are,

  1. Bacteria
  2. Algae
  3. Fungi
  4. Virus

30. The two groups of animals that are warm blooded are,

  1. Amphibians and Pisces
  2. Mammals and Aves
  3. Reptiles and Aves
  4. Annelida and Pisces

31. The hepatic portal vein conveys blood from,

  1. Kidneys to the liver
  2. Intestines to the liver
  3. Legs to the heart
  4. Liver to the heart

31. Which one of the following is a meristematic tissues?

  1. Epidermis
  2. Xylem
  3. Cortex
  4. Cambium

32. The skin is considered an excretory organ because,

  1. It has a fat layer for insulation
  2. It has sebaceous glands to exude oil
  3. It has sweat glands to extract sweat
  4. It has nerve endings connecting the brain

33. The juice that enters duodenum and supplies an alkaline medium is,

  1. Saliva
  2. Gastric juice
  3. Bile
  4. Pancreatic juice

34. A deadly disease caused by a virus on the heart muscles,

  1. Myocarditis
  2. Bronchitis
  3. Angina
  4. Hypertension

35. A multicolor leaf is used for certain experiments in photosynthesis with the view of showing that,

  1. Carbon dioxide is necessary for photosynthesis
  2. Chlorophyll necessary for photosynthesis
  3. Sunlight necessity
  4. Water necessity

36. Nephritis is a disease condition connected with the,

  1. Villi
  2. Alveoli
  3. Lymph nodes
  4. Kidneys

37. In the expiration of air from lungs

  1. Curvature of diaphragm decreases
  2. Pressure of chest cavity decreases
  3. Volume of chest cavity increases
  4. Alveoli walls contract and volume of lung decreases

38. Disinfectants are used to destroy bacteria. It is not always advisable to destroy them due to certain reasons. The need to destroy them is because,

  1. They decompose garbage
  2. They may be pathogenic
  3. They are involved in recycling of materials
  4. They are helpful in increasing fertility of soil

39. Which one of the following does not affect global warming?

  1. Increase in water vapor contained in air
  2. Increase in addition of green house gases to the atmosphere
  3. Absorption of heat rays from sun by certain gases
  4. Heat radiations from sun getting reflected back

40. Humans are badly affected when the quality of soil is not maintained. Farmers should be made aware of ways to maintain the texture soil. Which one of the following will affect soil in an unhealthy way?

  1. Farmers must practice multicrop agricultural methods
  2. Farmers should practice biological control of pests and not use pesticides
  3. Farmers should use compost fertilizer instead of chemical fertilizers
  4. Farmers must remove all residues of agricultural crops from agricultural lands