Zoology MCQs - Everyday Science Practice | PakExamPoint

Practise Zoology MCQs in Everyday Science. Attempt multiple-choice questions, check answers and revise related subtopics.

Zoology MCQs and revision practice

Study Zoology through multiple-choice questions in Everyday Science. This subtopic contains 1568 practice questions. Read the wording carefully, compare the options and attempt an answer before checking the solution in learning mode.

Use these Zoology MCQs to identify the facts, rules or methods you need to revise. Where an explanation is available, work through it and write down why your chosen option was correct or incorrect. Revisit difficult questions after reviewing your notes, then use exam mode for timed practice.

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Zoology: questions and answer review

Try each question before opening its answer. Record the concept behind each mistake and revisit it during your next practice session.

831. The term lodicules refers to _____?

اصطلاح لوڈیکولس سے مراد _____ ہے؟

Check answer and explanation

Answer: Perianth

Explanation Lodicules are small, scaly structures found at the base of a grass flower. They are essentially modified parts of the perianth, which is the non-reproductive part of a flower. The perianth consists of sepals and petals (or tepals if they are undifferentiated). In grasses, the perianth is reduced and modified into these small scales called lodicules.

832. What percentage of CO2 is present in atmosphere?

فضا میں کاربن ڈائی آکسائڈ کا کتنا فیصد موجود ہے؟

Check answer and explanation

Answer: 0.032%

Explanation 0.032% of the Earth's atmosphere consists of carbon dioxide (CO2). This percentage may vary slightly, but it generally remains around this value , contributing to the greenhouse effect .

833. Ray-finned fishes originated during the _____ period (444 to 416 million years ago).

کرنوں والی مچھلیاں _____ دور (444 سے 416 ملین سال پہلے) کے دوران پیدا ہوئیں۔

Check answer and explanation

Answer: Silurian

Explanation Ray-finned fishes originated during the Silurian period (444 to 416 million years ago). They are characterized by bony skeletons and fins supported by rays, distinguishing them from other fish groups.

834. _____ a freshwater cnidarian, exists only in polyp form and reproduces asexually by budding.

ایک میٹھے پانی کا نیڈیرین، صرف پولیپ کی شکل میں موجود ہے اور ابھرتے ہوئے غیر جنسی طور پر دوبارہ پیدا کرتا ہے۔ _______

Check answer and explanation

Answer: Hydra

Explanation Hydra is a freshwater cnidarian that exists only in the polyp form . It reproduces asexually through budding , where new individuals grow from the parent body.

835. An area in which an animal travels and gathers food is called _______?

ایک ایسا علاقہ جس میں جانور سفر کرتا ہے اور کھانا اکٹھا کرتا ہے _______ کہلاتا ہے؟

Check answer and explanation

Answer: Home range

Explanation A home range is the area where an animal travels, gathers food, and conducts its daily activities. Unlike a territory , a home range is not actively defended and may overlap with others.

836. Increase in behavioural response following repeated stimuli is known as ________?

بار بار کی حوصلہ افزائی کے بعد رویے کے ردعمل میں اضافہ ________ کے نام سے جانا جاتا ہے؟

Check answer and explanation

Answer: Sensitization

Explanation Sensitization is the increase in an organism's behavioral response to a stimulus after repeated exposure to it. It occurs when a stimulus elicits a stronger reaction over time. This often due to heightened awareness or sensitivity.

837. The most evolutionarily advanced type of nephridium in annelids is?

Check answer and explanation

Answer: Metanephridium

Explanation Metanephridia are well-developed excretory organs. They have an open funnel (nephrostome) and tubules. They efficiently remove wastes and regulate body fluids, making them evolutionarily advanced.

838. Bacteria which grow in oxygen and in absence of oxygen environment is known as ?

Check answer and explanation

Answer: Facultative Anaerobic

Explanation Bacteria capable of growth and survival in both oxygen-rich and oxygen-absent environments are known as facultative anaerobes. These organisms utilize aerobic respiration when oxygen is present and switch to anaerobic respiration or fermentation when it is absent.

839. _________ neurons in type 1 male fish fires at higher percentage as compared to type 2 male fish in midshipman.

مڈشپ مین میں ٹائپ 2 نر مچھلی کے مقابلے میں ٹائپ 1 نر مچھلی میں _________ نیوران زیادہ فیصد پر فائر ہوتے ہیں۔

Check answer and explanation

Answer: Pacemaker

Explanation Pacemaker neurons in Type 1 male midshipman fish fire at a higher rate compared to Type 2 males. This increased activity is essential for generating the vocalizations used in courtship.

840. The factor responsible for disruption of mutualism among species is called?

انواع کے درمیان باہمی خلل کا ذمہ دار عنصر کو کیا کہا جاتا ہے؟

Check answer and explanation

Answer: Invasion of exotic species

Explanation Invasion of exotic species disrupts mutualism by introducing non-native species that compete with or harm native species. This can lead to ecological imbalances , threatening existing symbiotic relationships.

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