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#Question id: 13221


There are two main types of water-transporting cells in the Xylem,

#Unit 6. System Physiology – Plant
  1. Tracheids and Xylem fibers
  2. Xylem parenchyma and Xylem fibers
  3. Xylem parenchyma and vessel elements
  4. Tracheids and vessel elements

Answer:- Option(s): 4


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#Question id: 5556

#Unit 5. Developmental Biology

Contact of a sea urchin egg with signal molecules on sperm causes the egg to undergo a brief ________.

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#Question id: 5557

#Unit 5. Developmental Biology

The plasma membrane of the sea urchin egg ________.

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#Question id: 5558

#Unit 5. Developmental Biology

Fertilization of an egg without activation is most like ________.

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#Question id: 5559

#Unit 5. Developmental Biology

During fertilization, the acrosomal contents ________.

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#Question id: 5560

#Unit 5. Developmental Biology

In a newly fertilized egg, the vitelline layer ________.

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#Question id: 5561

#Unit 5. Developmental Biology

In sea urchins, the "fast block" and the longer lasting "slow block" to polyspermy, respectively, are ________.

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