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Past Papers > 2011 > Flashcards

2011 Flashcards

1
Q

What are the different stages in succession?

A

Serra

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2
Q

What does pollen grains do?

A

Stops risk of dehydration of gametes

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3
Q

What produces embryo plant?

A

Zygote

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4
Q

What produces testa?

A

Integuments

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5
Q

Evidence which is oils confirm that mammals same species

A

Share same gene pool
Similar physiology
Similar behaviour
Similar genetic makeup

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6
Q

Give reasons for sterility of fox and dogs offspring

A

Chromosomes by homologous
Can’t pair during prophase 1
Meiosis doesn’t take place
No gametes produced

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7
Q

What is meant by semi observation replication?

A

Each DNA used as template to make new strand

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8
Q

What is the function of Sertoli cell?

A

Nutrition of sperm cells and supplies oxygen and removes waste products

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9
Q

Why is there more spermatozoa than spermatogonia?

A

4 cells produced during meiosis

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10
Q

What are the first organisms to colonise bare rock surface?

A

Pioneer

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Past Papers (5 decks)

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