What is the evolutionary advantage of an exoskeleton? A) It protects the body. B

Question

What is the evolutionary advantage of an exoskeleton? A) It protects the body. B) It waterproofs the body. C) It provides for muscle attachment D) It allows an animal to molt E) A, B, and C only. The monotremes are classified as mammals because they A) Are endoderms B) Are carnlovres C) Are carnlvores D) Have mammary glands E) Give birth to live young rather than lay eggs. What is the primary role of mushroom's underground mycellum? A) protection. B) sexual reproduction C) anchoring. D) absorbing nutrients. E) asexual reproduction. Why is the term cold-blooded not very appropriate for reptiles? A) the keratinized skin of the reptiles serves to insulate and conserve heat. B) the metabolism of the reptiles can generated internal heat by radiation to the environment. E) Reptiles swallow large prey whole to provide enough food to generate boy heat. Chemicals for insect communication are called A) ecdysones B) pheromones C) deutrosones D) protosones E) None of the above Gas exchange in the human lungs occur through structures called A) spiracles B) gas pores C) arteries. D) surfactant E) alveoli The arthropods, especially insects affect human life by which of the following? A) pollination of crops and fruits. B) competition for food of every kind. C) crop damage before and after harvest. D) production and spreading of many plant and human diseases. E) all of the above.

Explanation / Answer

Answer 79.

The evolutionary advantage of exoskeleton of animals are answer E) A,B and C only

The exoskeleteon protects the body, waterproofs the body and it provides for muscle attachment.

The endoskeleton are bones (internally present), where as exoskeletons ae the hard outer covering of the body in arthropods, insects, spiders etc. It helps in great defence as like wearing a raincoat .

It keep awat from getting dry or getting wet, proveds movement partly as muscle attachment to the exoskeleton

80. The monotrems are classified as mammals as (D) they have mammary glands.

The monotremes are primitive mammals whic lay eggs rather than giving birth .

81. The primary role of undeground mushroom's mycellium is (B) absorbing the nutrients

as the hypha secretes enzyme to degrade polymers to monomers and my cellim absorbs these nutrient by diffusion and active transport.

82. The cold blooded term is not a very appropriate for reptiles as (A) The keratinized skin of reptiles serves to insult and conserve heat. Keratinocytes are cells present in the epidermis of skin and produce keratin.

83. Gas exchange in the human lung occur through structure called alveoli. Alviole are small/tyny sacs in our lung that exchange oxygen and carbon dioxide .

84 The arthropods , especially insects affect human life by (E) all of the above

i.e The insects help in pollination of crops and fruits, competeion for food of every kind, crop damage before and after harvest and production and spreading of many plant and human.

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