Bio - Section 2: Nutrition and respiration

Question 1

Chemical equation of photosynthesis

Answer 1

carbon dioxide + water (+ sunlight) –> glucose + oxygen

Question 2

Chemical equation of aerobic respiration

Answer 2

glucose + oxygen –> carbon dioxide + water (+ energy)

Question 3

Inside which organelle does photosynthesis occur?

Answer 3

chloroplasts

Question 4

Name of the green pigment that traps sunlight inside chloroplasts

Answer 4

chlorophyll

Question 5

What affects the rate of photosynthesis?

Answer 5

light intensity, carbon dioxide concentration, temperature

Question 6

What are the adaptations of plant leaves for photosynthesis?

Answer 6

Large surface area, while the leaves are thin; Waterproof waxy cuticle allows light to reach the chloroplasts in mesophyll cells and prevents direct evaporation of water; Lower epidermis us covered in stomata which allow carbon dioxide to diffuse into the leaf and oxygen out of the leaf;

Question 7

Why do plants need nitrate ions for growth?

Answer 7

NItrate ions provide a source of nitrogen which the plant needs to make amino acids

Question 8

Why do plants need magnesium ions for growth?

Answer 8

Magnesium is a critical part of chlorophyll which is found inside the chloroplasts.

Question 9

Which cell layer of the leaf contains the highest number of chloroplasts?

Answer 9

Palisade mesophyll layer

Question 10

How to gases like carbon dioxide and oxygen get in and out of the leaf?

Answer 10

Through the stomata.

Question 11

What are the names of the layers of a plant leaf from top to bottom?

Answer 11

TOP - waxy cuticle - upper epidermis - palisade mesophyll layer - spongy mesophyll layer - lower epidermis (with stomata) - waxy cuticle - BOTTOM