Free Biodiversity and Variety of Life MCQs with Answers

• A. Both forewings and hindwings develop
• B. Labium
• C. Mandibles become harder
• D. Anal cerci

Explanation: Cockroaches undergo paurometabolous development. The nymph moults about 67 times to reach the adult form.

• A. Malpighian tubules convert nitrogenous wastes into urea
• B. Males bear short anal styles not present in females
• C. Nervous system comprises of a dorsal nerve cord and ten pairs of ganglia
• D. The forewings are tegmina which are used in flight

Explanation: Males have paired anal styles on 9th abdominal sternite which are absent in females.

• A. Fertilization of eggs occurs inside the body
• B. The typhlosole greatly increases the effective absorption area of the digested food in the intestine
• C. The S-shaped setae embedded in the integument are the defensive weapons used against the enemies
• D. It has a long dorsal tubular heart

Explanation: In Pheretima, the intestine is next to the stomach. It is a long, wide and thin-walled tube extending from the 15th segment to the last.

• A. Malpighian tubules are its excretory organs projecting out from the colon
• B. Oxygen is transported by haemoglobin in their blood
• C. Its nitrogenous excretory product is urea
• D. Their food is ground by mandibles and the gizzard

Explanation: The mouth part of the cockroach contains two mandibles. When both the mandibles work simultaneously in the horizontal plane, the food…

• A. Paired cerebral hemispheres
• B. A hepatic portal system
• C. Nucleated red blood cells
• D. A thyroid as well as parathyroid

Explanation: Human erythrocytes are enucleated and discoidal while in frogs erythrocytes are large, oval and biconvex nucleated cells.

• A. Clitellum - Secretes cocoon
• B. Gizzard - Absorbs digested food
• C. Setae - Defence against predators
• D. Typhlosole - Storage of extra nutrients

Explanation: In a mature earthworm, the 14th and 16th segments are covered by a prominent dark band of glandular tissues called clitellum which…

• A. Nails
• B. Ear ossicles
• C. Tip of the nose
• D. Vertebrae

Explanation: Yellow elastic fibrocartilage, a type of skeletal tissue, is found in the pinna, Eustachian tubes, epiglottis and tip of the nose.

• A. Gut peristalsis
• B. Setae
• C. Coelomic fluid
• D. Blood

Explanation: The hydraulic skeleton is the system of support found in soft-bodied invertebrates which relies on the incompressibility of fluids…

• A. Rat: Left kidney is slightly higher in position than the right one
• B. Cockroach: 10 pairs of spiracles(2 pairs on thorax and 8 pairs on abdomen)
• C. Earthworm: The alimentary canal consists of a sequence of pharynx, oesophagus, stomach, gizzard and intestine.
• D. Frog: Body divisible into three regions: head, neck and trunk.

Explanation: There are 10 pairs of spiracles in cockroach. Two pairs are thoracic in which first pair is known as mesothoracic, lying infront of the…

• A. Blue with haemocyanin in corpuscles
• B. Blue with haemocyanin in plasma
• C. Red with haemoglobin in corpuscles
• D. Red with haemoglobin in plasma

Explanation: The circulatory or blood vascular system of earthworm is a closed system consisting of blood vessels and capillaries which ramify all…

• A. Clitellum
• B. Many eyes
• C. Dorsal surface
• D. Lateral sides

Explanation: Photoreceptors are restricted only to the dorsal surface. They are more numerous on the prostomium and peristomium of the earthworm and…

• A. Heterotroph
• B. Organic synthesis
• C. Eukaryotes
• D. Multicellular

Explanation: Organic synthesis is referred to as photosynthesis in which inorganic molecules (water and carbon dioxide) are converted into organic…

• A. Diploblastic
• B. Acoelomate
• C. Triploblastic
• D. Pscudococlomate

Explanation: Grade radiata includes only one phylum; Cnidaria. These animals are always diploblastic and have gastrovascular cavity with sac type…

• A. Germlayer
• B. Ectoderm
• C. Mesoderm
• D. Endoderm

Explanation: Ectoderm form skin and nervous system. Endoderm form digestive system and rest of the systems in triploblastic animals are formed from…

• A. Ectoderm
• B. Endoderm
• C. Mesoderm
• D. Ectoderm and endoderm

Explanation: Ectoderm forms skin and nervous system. Endoderm forms lining of digestive system and rest of the systems in triploblastic animals…

• A. Lesser developed
• B. Lacking mesoderm
• C. Placed in one phylum only
• D. Triploblastic

Explanation: All bilaterally symmetrical animals are triploblastic.

• A. Coelomic Epithelium
• B. Ectoderm
• C. Visceral mesoderm
• D. Parictal Mesoderm

Explanation: All bilateral symmetrical animals are triploblastic. Coelom (body cavity) is formed due to splitting of mesoderm at embryonic stages.

• A. Sac type digestive system
• B. Well-developed respiratory system
• C. Parenchyma till the body space
• D. Well-developed excretory system

Explanation: Acoelomate includes animals of Phylum Platyhelminthes in which respiratory and circulatory system is absent.

• A. Platyhelminthes
• B. Echinoderms
• C. Molluscs
• D. Aschelminthes

Explanation: Aschelminthes or nematodes are pseudocoelomates.

• A. Coelom
• B. Gastrocoel
• C. Pseudocoelum
• D. Sponogocoel

Explanation: Coelom is true body cavity, which is always fonned from mesoderm. Nematodes are Pseudocoelomates