biology MCQs - 11th class Chapter 12 Mcqs

1

The sum total of all processes involved in the taking in and utilization of elements for growth, repair, and maintenance is called?

A

Digestion

B

Metabolism

C

Nutrition

D

Absorption

2

Organisms that can manufacture their own organic compounds from inorganic raw materials are known as?

A

Heterotrophs

B

Autotrophs

C

Saprotrophs

D

Parasites

3

Which element is a key component of chlorophyll?

A

Iron

B

Phosphorus

C

Nitrogen

D

Magnesium

4

Nitrogen deficiency in plants typically results in stunted growth and what other visible symptom?

A

Dark green leaves

B

Chlorosis

C

Thickened stems

D

Excessive flowering

5

Puccinia is an example of a parasitic fungus that destroys which plant?

A

Corn

B

Rice

C

Wheat

D

Barley

6

The association between a fungus and the roots of higher plants is known as?

A

Lichen

B

Mycorrhiza

C

Nodule

D

Parasitism

7

Insectivorous plants are true autotrophs that trap insects primarily to supplement their diet with which compounds?

A

Carbohydrates

B

Lipids

C

Nitrogenous compounds

D

Sugars

8

Which insectivorous plant has leaves modified into a sac or pitcher partly filled with water?

A

Venus-fly trap

B

Sundew

C

Pitcher plant

D

Dodder

9

The rasping organ used by the garden snail for feeding is called the?

A

Stylet

B

Mandible

C

Radula

D

Tentacle

10

Animals that feed on detritus, which is organic debris from decomposing plants and animals, are called?

A

Herbivores

B

Carnivores

C

Omnivores

D

Detritivores

11

Which of the following is an example of a filter feeder?

A

Hydra

B

Earthworm

C

Mussel

D

Aphid

12

A parasite that lives within the host's body is called an?

A

Ectoparasite

B

Endoparasite

C

Facultative parasite

D

Obligate parasite

13

Which of the following is a common endoparasite in humans?

A

Leech

B

Flea

C

Tape worm

D

Tick

14

The process of taking in complex food is known as?

A

Digestion

B

Ingestion

C

Assimilation

D

Egestion

15

In Amoeba, digestion occurs within a food vacuole and is therefore described as?

A

Extracellular

B

Intercellular

C

Intracellular

D

Exocellular

16

The digestive cavity in Hydra, which has a single opening for both ingestion and egestion, is called a?

A

Coelom

B

Alimentary canal

C

Gastrovascular cavity

D

Gut

17

The stinging cells in the tentacles of Hydra are called?

A

Cnidocils

B

Nematocysts

C

Gastrodermal cells

D

Phagocytes

18

The digestive system of a cockroach is of what type?

A

Sac-like

B

Tubular

C

Intracellular

D

Branched

19

In the cockroach, partly digested food is temporarily stored in the?

A

Gizzard

B

Crop

C

Mesenteron

D

Rectum

20

The main sites of digestion in the human digestive system are the oral cavity, stomach, and?

A

Esophagus

B

Large intestine

C

Small intestine

D

Liver

21

The enzyme in saliva that begins the digestion of starch is?

A

Pepsin

B

Lipase

C

Amylase or ptyalin

D

Trypsin

22

The small oval lump of softened, partly digested food rolled by the tongue is called a?

A

Chyme

B

Bolus

C

Feces

D

Nutrient

23

The wavelike muscular contractions that move food along the digestive tract are called?

A

Antiperistalsis

B

Peristalsis

C

Swallowing

D

Egestion

24

The ring of muscle at the junction of the esophagus and stomach is the?

A

Pyloric sphincter

B

Cardiac sphincter

C

Ileocolic sphincter

D

Anus

25

Parietal or oxyntic cells in the stomach wall secrete what substance?

A

Mucus

B

Pepsinogen

C

Gastrin

D

Hydrochloric acid

26

The inactive form of pepsin secreted by zymogen cells is?

A

Trypsinogen

B

Pepsinogen

C

Amylopsin

D

Enterokinase

27

The semi-solid mass of partially digested food that leaves the stomach is called?

A

Bolus

B

Chyme

C

Feces

D

Bile

28

The first part of the human small intestine, about 20-25 cm long, is the?

A

Jejunum

B

Ileum

C

Duodenum

D

Caecum

29

The hormone secretin, produced by the intestinal mucosa, stimulates the pancreas to produce what?

A

Bile

B

Gastric juice

C

Pancreatic juice

D

Mucus

30

The fat-digesting enzyme found in pancreatic juice is called?

A

Amylase

B

Trypsin

C

Lipase

D

Pepsin

31

Trypsinogen is activated to trypsin by an enzyme called?

A

Pepsin

B

Lipase

C

Enterokinase

D

Secretin

32

Bile, which is secreted by the liver, aids in digestion by?

A

Digesting proteins

B

Emulsifying fats

C

Breaking down starch

D

Neutralizing acid only

33

A condition caused by the accumulation of bile pigments in the blood is known as?

A

Jaundice

B

Gall stones

C

Dyspepsia

D

Ulcer

34

Most of the absorption of digested food takes place in which part of the small intestine?

A

Duodenum

B

Jejunum

C

Ileum

D

Colon

35

The finger-like outgrowths on the internal surface of the ileum are called?

A

Microvilli

B

Lacteals

C

Villi

D

Folds

36

Fats, after being absorbed and recombined in epithelial cells, enter which vessels in the villi?

A

Blood capillaries

B

Arterioles

C

Lacteals

D

Venules

37

From the blind end of the caecum arises a finger-like process called the?

A

Rectum

B

Colon

C

Appendix

D

Ileum

38

Excessive absorption of water in the large intestine leads to a condition called?

A

Diarrhoea

B

Constipation

C

Dyspepsia

D

Vomiting

39

Useful bacteria in the large intestine synthesize vitamins, especially which vitamin?

A

Vitamin A

B

Vitamin C

C

Vitamin D

D

Vitamin K

40

The condition characterized by incomplete or imperfect digestion, abdominal discomfort, and flatulence is?

A

Dyspepsia

B

Obesity

C

Anorexia Nervosa

D

Botulism

41

A severe form of food poisoning caused by toxins from Clostridium botulinum is?

A

Salmonellosis

B

Botulism

C

Dyspepsia

D

Campylobacteriosis

42

The eating disorder characterized by a fear of becoming obese, leading to loss of appetite, is?

A

Bulimia Nervosa

B

Obesity

C

Anorexia Nervosa

D

Dyspepsia

43

Masses of dilated, tortuous veins in the anorectal mucosa are known as?

A

Ulcers

B

Piles or hemorrhoids

C

Appendicitis

D

Tumors

44

A sore that develops when the mucus layer of the stomach or duodenum breaks down is an?

A

Ulcer

B

Pang

C

Burn

D

Hernia

45

In the human digestive system, the liver, pancreas, and salivary glands are known as?

A

Main organs

B

Accessory organs

C

Primary sites

D

Tubular parts

46

In herbivorous mammals like deer and sheep, which teeth are typically missing?

A

Incisors

B

Molars

C

Canines

D

Premolars

47

The first phase of digestion in Amoeba occurs in an _______ medium.

A

Alkaline

B

Neutral

C

Acidic

D

Salty

48

The digestive system of Planaria is described as a branched?

A

Tubular gut

B

Alimentary canal

C

Gastrovascular cavity

D

Coelenteron

49

In the cockroach, the gizzard's primary function is?

A

Storing food

B

Digesting food

C

Grinding food

D

Absorbing water

50

Which hormone stimulates the production of more gastric juice when protein is present in food?

A

Secretin

B

Gastrin

C

Insulin

D

Enterokinase