What is the evolutionary advantage of an exoskeleton? A) It protects the body. 8

Question

What is the evolutionary advantage of an exoskeleton? A) It protects the body. 8) It waterproofs the body. C) It provides for muscle attachment D) It allows an animal to molt 79. 80. in lactating mothers, the two hormones that promote milk synthesis and milk rel respectively are and A)prolactin and calcitonin. B) prolactin and oxytocin. C) follicle stimulating hormone and luteinizing hormone D) luteinizing hormone and oxytocin. E) estrogen and progesterone. What is the primary role of mushroom's underground mycelium? A) protection. B) sexual reproduction C) anchoring. 81. D) absorbing nutrients. E) asexual reproduction 82. Which gland is both endocrine and exocrine? A). thyroid gland. B). pineal gland. C). pancreatic gland. D). adrenal gland. E). parathyroid gland. Chemicals for insect communication are called A) ecdysones B) pheromones C) deutrosones 83. D) protosones E) None of the above 84. Gas exchange in the human lungs occur through structures called A) spiracles B) gas pores C) arteries. D) surfactant E) alveoli 85) 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

Hi Answer:

79. What is the evolutionary advantage if an exoskeleton

Answer. Option. E (A, B and C ) (It protect the body, it water proof the body, it provide the muscle attachment.

Explanation: The exoskeleton is the outer rigid covering of the body and it is made up of chitin in the addition of calcium carbonate which makes it more harder.it have multiple functioning. Such as protection, excretion, sensing, support, feeding and acting as a barrier against desiccation in terrestrial organisms.

80. In lactating mothers, the two hormones that permute milk synthesis and milk release respectively are Prolactin and Oxytocin.

Explanation: Prolactin is also known as luteotropic hormone or luteotropin. Prolactin is secreted by the pituitary gland. It stimulates the production of breast milk and necessary for milk production during breastfeeding. It plays an essential role in metabolism, regulation of the immune system and pancreatic development. Oxytocin is peptide hormone and neuropeptide. It is normally produced by the paraventricular nucleus of the hypothalamus and released by the posterior pituitary. Oxytocin stimulates the milk ejection. It also helps with birth, bonding with the baby, and milk production

81. What is the primary role of mushroom's underground mycelium?

Answer. Option. D (Absorbing nutrients)

Explanation: The mushroom’s underground mycelium absorb nutrients. The nutrients are absorbed into 2 steps. First enzymes are secreted which break the polymers into monomers and then via facilitated diffusion or active transport nutrients are absorbed.

82. Which gland is both endocrine and exocrine?

Answer. Option. C (Pancreatic gland)

Explanation: The pancreas is a dual function gland it acts as both endocrine as well as exocrine. The endocrine function is carried out by specific cell cluster called islets of Langerhans. These cells plays an important role in glucose metabolism and blood glucose regulation. Pancreas also carry out the exocrine gland and its secretions help in the food digestion. The pancreatic fluid contain some specific enzymes which help in the breakdown of the carbohydrates, protein and lipids in the chyme.

83. Chemicals for insect communication are called

Answer. Option. B (pheromones)

Explanation: The pheromones are also called the insect perfumes. It is used by the insects for communications within the same species. Sex pheromones are used to attract insects for mating within the same species. Pheromones are of different type like alarm pheromones, aggregation pheromones, trail pheromones which are used by insects for sending warning signals, aggregation signal and moving signal respectively.

84. Gas exchange in the human lungs occur through structures called

Answer. Option. E (Alveoli)

Explanation: In lungs the gas exchange took place in alveoli and the capillaries which surrounds the alveoli. The gas exchange took place through diffusion where oxygen and carbon dioxide moves from higher concentration to lower concentration means oxygen is diffuses out from lungs to alveoli and the carbon dioxide from alveoli to lungs.

85. The arthropods, especially insects affect human life by which of the following?

Answer. Option. E (All the above)

Explanation: Insects affect human life in both positive and negative way, in a positive way they help in the pollination of crops and fruits due to which human got food and fruits. There are some beneficial insects which also help human by eating up the other harmful insects. In another way insect cause damage to human by crop damage and spreading disease in both plants and animals.

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