Bio Paper 2 Flashcards

1
Q

Factors that affect rate of photosynthesis

A

Light
Carbon Dioxide
Temperature

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2
Q

Inverse square law

A

(Original light intensity x original distance^2)/new distance^2

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3
Q

Palisade Cells

A

Near top of leaf and packed with chloroplast

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4
Q

Stomata

A

Open and close due to guard cells taking in water.

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5
Q

How are root hair cells adapted

A

Large SA:V ratio

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6
Q

What is transpiration

A

Movement of water up the plant
Cohesion-Tension Theory

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7
Q

What are Xylem Cells

A

Continuous pipes made from lignin.
Dead cells for more space

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8
Q

What is Translocation

A

Active transport of sucrose and amino acids around plant from store to sink.
Move through phloem

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9
Q

How does phloem work

A

Flow through sieve cells with companion cells to pump sucrose through

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10
Q

What are the glands for Hormones

A

Pituitary
Adrenal
Thyroid
Pancreas
Ovaries
Testes

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11
Q

What does Thyroxine do

A

Controls metabolism. Amount controlled by TRH and TSH

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12
Q

What is the negative feedback system of Thyroxine

A

Low Thyroxine -> TRH produced -> TSH -> Thyroxine produced -> TRH stops

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13
Q

What does Adrenaline do

A

Increased strength of heart
Tunnel vision
Widened lumen
Increased glucose levels

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14
Q

What is Type 1 diabetes and how to control

A

Immune system attacks pancreatic cells
Inject insulin

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15
Q

What is Type 2 diabetes and how to control

A

Not enough insulin is produced and Target Organs become resistant
Do exercise and eat proper foods

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16
Q

What does Insulin and Glucagon do

A

Insulin - Glucose into Glycogen
Glucagon - Glycogen into Glucose

17
Q

Where are glucose levels detected

18
Q

Cycles of Menstruation

A

Day 1-5 = avg shedding
Day 14 = Ovulation

19
Q

What is Menstruation controlled by

A

Oestrogen and Progesterone - produced in the ovaries

20
Q

What does FSH do and where

A

Produced in Pituitary
Causes maturation of egg

21
Q

What does Oestrogen do and where

A

Produced in Ovary
Inhibits FSH, Thickens lining of uterus

22
Q

What does LH do and where

A

Produced in pituitary
Stimulates release of egg

23
Q

What does Progesterone do and where

A

Produced in corpus luteum
Maintains uterus lining

24
Q

What do Oral Contraceptives do

A

Contains progesterone and sometimes oestrogen.

Lining doesn’t shed. Stop FSH and LH

25
Q

What is clomifene therapy

A

Inject FSH and LH

26
Q

Biotic VS Abiotic

A

Biotic are living
Abiotic are not

27
Q

What effects food security

A

Increase human population
Increased meat and dairy consumption
New pests and pathogens
Environmental change
Biofuels

28
Q

How does Carbon Cycle work

A

Respiration
Photosynthesis
Eating
Decomposition
Combustion

29
Q

Nitrogen Fixing Bacteria

A

Turns noticed into ammonia - found in legumes of nodules

30
Q

Nitrifying bacteria

A

Ammonia into nitrates

31
Q

Denitrifying

A

Turns nitrates back into nitrogen