Following process and their mechanism during fertilization in mammals.

a. Rheotaxis	i.A sensing mechanism in which, the oocyte and its accompanying cumulus cells secrete molecules that attract capacitated sperm toward the egg during the last stages of sperm migration
b.  Chemotaxis	ii.It is a transient event, and sperm are given a relatively brief window of competence during which they can successfully fertilize the egg.
c.  Capacitation		iii.it is the ability to sense temperature difference and preferentially swim from cooler to warmer sites is found only in capacitated sperm.
d. Thermotaxis		iv.Sperm receive long-distance directional cues from the flow of liquid from the oviduct to the uterus and they will migrate against the direction of the flow—using CatSper calcium channels to sense calcium influx and monitor the direction of the current

Which of the following option is correct?

#Question id: 9164

#Unit 9. Diversity of Life Forms

Use the following figures to answer the question below.

East of the Mississippi River, in Hopkinsville Kentucky, the mean annual precipitation is 130 cm. The mean annual temperature is 14.3°C. In the winter, the mean temperature is 7.3°C, while in summer it is 20.6°C. Using the climograph shown here, how would we classify the biome found in Hopkinsville?

#Question id: 9163

#Unit 9. Diversity of Life Forms

Use the following figures to answer the question below

Based on the data in the figures, which of the following statements are correct?

I) Area 1 would be considered a desert because of its high average temperature.

II) Area 1 has more average precipitation than Area 2.

III) Area 2 would be considered a desert because of its low average precipitation.

IV) Area 2 has a larger annual temperature variation.

#Question id: 9159

#Unit 9. Diversity of Life Forms

Which of the following investigations would shed the most light on the future distribution of organisms in temperate regions that are faced with climate change?

#Question id: 9157

#Unit 9. Diversity of Life Forms

At 15-30°N, air masses formed over the Pacific Ocean are moved by prevailing westerlies, where they encounter extensive north-south mountain ranges. Which statement best describes the outcome of this encounter between a landform and an air mass?

#Question id: 9156

#Unit 9. Diversity of Life Forms

Generalized global air circulation and precipitation patterns are caused by ________.

#Question id: 9153

#Unit 9. Diversity of Life Forms

Imagine some cosmic catastrophe jolts Earth so that its axis is perpendicular to the orbital plane between Earth and the sun. The most obvious effect of this change would be ________.