Science Yr09 Sum1

Question 1

B1.1 What is meristem tissue?

Answer 1

Stem cells- undifferentiated plant cells

Question 2

B1.2 Where is meristem tissue found?

Answer 2

Tips of roots and shoots

Question 3

B1.3 Put these into order smallest to largest: oak tree, roots, root hair cell, root hair tissue, water transport system

Answer 3

Root hair cell, root hair tissue, roots, water transport system, oak tree.

Question 4

B1.4 How are root hair cells adapted to their function?

Answer 4

Have long hairs to give a large surface area

Question 5

B1.5 What is the function of xylem tissue and how are the cells adapted to their function?

Answer 5

Carry water and mineral around the plant, hollow cells forming tubes

Question 6

B1.6 What is the function of phloem tissue and how are cells adapted to their function?

Answer 6

Carry sugars around the plant. Has sap which ca move between cells via pores at each end.

Question 7

B1.7 What is transpiration?

Answer 7

Evaporation of water and loss through stomata of leaf

Question 8

B1.8 List 4 factors that will affect transpiration rate.

Answer 8

Temperature, humidity, light intensity, air movement

Question 9

B1.9 What is translocation?

Answer 9

The movement of suagrs around the plant in the phloem.

Question 10

B1.1 Describe the function of palisade mesophyll

Answer 10

Photosynthesis

Question 11

B1.11 Describe the function of guard cells

Answer 11

Open and close stomata

Question 12

B1.1 What is an ecosystem?

Answer 12

The interaction of a community of living organisms with the non-living parts of their environment.

Question 13

B1.2 What is a community?

Answer 13

All of the living organisms within a habitat

Question 14

B1.3 List 3 things that animals compete for.

Answer 14

1) Food 2) Mates 3) Territory

Question 15

B1.4 List 4 things that plants compete for.

Answer 15

1) Light 2) Space 3) Minerals (ions) 4) Water

Question 16

B1.5 What is interdependence?

Answer 16

Where species depend on other species

Question 17

B1.6 What is a stable community?

Answer 17

Where all the species and environmental factors are in balance so that population sizes remain fairly constant.

Question 18

B1.7 What are abiotic factors?

Answer 18

Non-living factors

Question 19

B1.8 What are biotic factors?

Answer 19

Living factors

Question 20

B1.9 What are adaptations?

Answer 20

Any feature that allows an organism to survive in it’s habitat

Question 21

B1.1 Name the three types of adaptation.

Answer 21

Structural, Functional and Behavioural

Question 22

B1.11 What are extremophiles?

Answer 22

Organisms that live in extreme conditions

Question 23

C1.1 Describe the nuclear model of an atom

Answer 23

Mostly empty space with the mass concentrated in a positively charged nucleus of protons and neutrons, surrounded by electrons orbiting in shells.

Question 24

C1.2 State the relative charge on a proton, neutron and electron

Answer 24

Proton +1, Neutron 0, Electron -1

Question 25

C1.3 State the relative mass of a proton, neutron and electron

Answer 25

Proton 1, Neutron 1, Electron Very small

Question 26

C1.4 Define isotope

Answer 26

Atom of the same element with the same number of protons but a different number of neutrons

Question 27

C1.5 Give the equation to calculate the number of neutrons in an atom

Answer 27

Number of neutrons = mass number - atomic number

Question 28

C1.6 In what order were the subatomic particles discovered?

Answer 28

Electron then Proton then Neutron

Question 29

C1.7 Describe the plum pudding model

Answer 29

Ball of positive charge containing negative electrons

Question 30

C1.8 What did the alpha particle scattering experiment prove?

Answer 30

Atoms have a very small dense nucleus with a positive charge

Question 31

C1.9 Describe the change that Bohr made to the nuclear model.

Answer 31

Electrons orbit the nucleus at specific distances

Question 32

C1.1 Which scientist’s experimental work proved that neutrons exist within the nucleus?

Answer 32

James Chadwick

Question 33

C1.1 Define group in terms of the periodic table

Answer 33

A group is a column on the periodic table made up of elements with similar chemical properties

Question 34

C1.2 State why elements in the same group have similar chemical properties

Answer 34

Elements in the same group have the same number of electrons on their outer shell

Question 35

C1.3 What does the group number tell you in terms of electrons?

Answer 35

The number of electrons on the outer shell.

Question 36

C1.4 Give the alternative names for groups 0, 1 and 7

Answer 36

Noble gases, Alkali metals and Halogens

Question 37

C1.5 State why group 0 elements are unreactive

Answer 37

Group 0 elements have a full outer shell of electrons

Question 38

C1.6 State the trend in the boiling points of the noble gases

Answer 38

Increases as you move down the group

Question 39

C1.7 State the trend in the melting points of the group 1 metals

Answer 39

Decreases as you move down the group

Question 40

C1.8 State the trend in the reactivity of the group 1 metals

Answer 40

Increases as you go down the group

Question 41

C1.9 State the trend in the reactivity of the halogens

Answer 41

Decreases as you go down the group

Question 42

C1.1 State the trend in melting and boiling points of the halogens

Answer 42

Increases as you move down the group