All Free Biology MCQs with Answers

1361. Kingdom protista includes_____________phyla?

• A. 27
• B. 28
• C. 26
• D. 29

Explanation: In the classification system used by the source text, Kingdom Protista is divided into 27 phyla. Students may choose 28 because different textbooks revise protist classification and count groups differently, but within the stated textbook classification the expected number is 27. The submitted key matches.

1362. Most dinoflagellates are___________?

• A. Unicellular
• B. Multicellular
• C. Both of these
• D. Zooflagellates

Explanation: Most dinoflagellates are unicellular organisms with two flagella and characteristic grooves in their cell covering. Students may choose zooflagellates because dinoflagellates are flagellated, but zooflagellate is a different classification group rather than a description of their usual body form. The submitted key matches.

1363. Plasmodium belongs to__________?

• A. Ciliates
• B. Apicomplexans
• C. Actinopods
• D. Foraminferans

Explanation: Plasmodium is an apicomplexan, a group of parasitic protists that possess an apical complex used to enter host cells. Students may choose ciliates because both are protozoan parasites in some contexts, but Plasmodium has no cilia and belongs specifically to Apicomplexa. The submitted key matches.

1364. How many species of mushrooms are edible?

• A. 100
• B. 200
• C. 3000
• D. 4000

Explanation: About 200 mushroom species are generally reported as edible, although the exact number varies with classification and regional use. The likely mistake is choosing 3000, which confuses all described mushroom species with the much smaller group considered safe and edible.

1365. Fungi which get their food directly from dead organic matter are called______________?

• A. Parasitic fungi
• B. Predators
• C. Mutualists
• D. Decomposers

Explanation: Decomposer fungi obtain nutrients by secreting enzymes onto dead organic matter and absorbing the soluble products. A student may choose parasitic fungi, but parasites obtain nutrients from living hosts rather than dead material.

1366. Which one of the following is different from all the rest regarding the number of cells inits body_______________?

• A. Rusts
• B. Mushrooms
• C. Molds
• D. Yeasts

Explanation: Yeasts are usually unicellular fungi, whereas rusts, mushrooms and molds are mainly multicellular and form hyphae or larger fruiting structures. The likely mistake is choosing molds because their individual hyphae may look like separate units, although the mold body is multicellular.

1367. Death cap/death angel (Amanita) and Jack O Latern mushroom are examples of__________?

• A. Edible mushrooms
• B. Poisonous mushrooms
• C. Both of these
• D. None of these

Explanation: Death cap, death angel and Jack-o'-lantern mushrooms contain toxic compounds and are classified as poisonous mushrooms. The likely mistake is choosing edible mushrooms because they have a recognizable mushroom form, but appearance does not indicate safety.

1368. Which of the following group represent pathological fungi______________?

• A. Mushrooms morels and truffles
• B. Rusts smuts and molds
• C. Penicillium
• D. All of these

Explanation: Rusts, smuts and many molds include fungi that cause diseases in plants, animals or humans, so they are commonly grouped as pathological fungi. Penicillium is a genus with useful species as well as some harmful effects, so it is not the best group answer by itself.

1369. The discease in which transmembrane carrier for the chloride ion is not produced is__________?

• A. Hyperchloesterolemia
• B. Cystic fibrosis
• C. Severe combined immunodeficiency syndrome
• D. AIDS

Explanation: Cystic fibrosis results from mutations in the CFTR gene, which normally produces a transmembrane chloride channel. Defective chloride transport disturbs salt and water movement across epithelial surfaces, producing thick mucus. Students may choose AIDS because it is also a serious disease, but AIDS is caused by HIV attacking immune cells, not by loss of a chloride channel.

1370. The first organism of whose genome was completely discovered was____________?

• A. Human beings
• B. Influenza Virus
• C. Hemophilus Influenza
• D. None of these

Explanation: Haemophilus influenzae was the first free-living organism whose complete genome was sequenced, in 1995, establishing an important milestone in genomics. The likely mistake is human beings, because the human genome project became famous later, but the human genome was not the first complete genome discovered.