Following are the statements related to mammalian chaemotaxis:

A. During chaemotaxis, the oocyte and its accompanying cumulus cells secrete molecules that attract only uncapacitated sperm toward the egg during the last stages of sperm migration.

B. These chaemotactic compound are hormone progesterone, which is made by the cumulus cells.

C. Progesterone has been shown to bind to a receptor that activates Ca2+ channels in the cell membrane of the sperm tail, leading to sperm hyperactivity and provides directional cue.

D. Cumulus cells also secrete a substance, CRISP1, that attracts sperm and hyperactivates them through CatSper channels similar as in sea urchins.

Which of  the following statement is incorrect?

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#Question id: 17666

#Unit 11. Evolution and Behavior

 In the Mesozoic era, periods included;

A. Cretaceous

B. Jurassic

C. Triassic

i) Increase of dicotyledons

ii) Seeds ferns disappear

iii) Rapid development of angiosperms

iv) Spread of cycads and conifers

v) Gymnosperms declined

Find out the correct match of given period with their plants diversification events;

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#Question id: 17667

#Unit 11. Evolution and Behavior

Jurassic periods belong to the Mesozoic era has various characteristics of invertebrates and vertebrates animals except;

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#Question id: 17668

#Unit 9. Diversity of Life Forms

The most recent common ancestor of all land plants was probably similar to modern-day members of which group? 

TLS Online TPP Program

#Question id: 17669

#Unit 9. Diversity of Life Forms

Use the letters A-D to label where on the phylogenetic tree each of the following derived characters appeared. 

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#Question id: 17670

#Unit 9. Diversity of Life Forms

The following are common to both charophytes and land plants except 

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#Question id: 17671

#Unit 9. Diversity of Life Forms

Protection from predators