The kidneys in human beings are a part of the system for

1

(a)

Nutrition

(b)

Respiration

(c)

Excretion

(d)

Transportation

The xylem in plants is responsible for

1

(a)

Transport of water

(b)

Transport of food

(c)

Transport of amino acids

(d)

Transport of oxygen

The autotrophic mode of nutrition requires

1

(a)

Carbon dioxide and water

(b)

Chlorophyll

(c)

Sunlight

(d)

All of the above

The breakdown of pyruvate to give carbon dioxide, water and energy takes place in

1

(a)

Cytoplasm

(b)

Mitochondria

(c)

Chloroplast

(d)

Nucleus

Which of the following statements about the autotrophs is incorrect?

1

(a)

They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll

(b)

They store carbohydrates in the form of starch

(c)

They convert carbon dioxide and water into carbohydrates in the absence of sunlight

(d)

They constitute the first trophic level in food chains

Deoxygenated blood enters the heart through

1

(a)

Right ventricle

(b)

Right atrium

(c)

Light ventricle

(d)

Left atrium

Complete digestion of carbohydrates, proteins and fats takes place in

1

(a)

Stomach

(b)

Large intestine

(c)

Small intestine

(d)

Villi

Green dots present on a leaf are cell organelles called

1

(a)

Chlorophyll

(b)

Chloroplast

(c)

Stomach

(d)

Veins

Cramps caused during sudden activities are due to the formation of

1

(a)

Ethanol

(b)

Acetic acid

(c)

Lactic acid

(d)

Excess of water

How do autotrophs obtain CO₂ and N₂ to make their food?

1

(a)

CO2 is obtained from leaves through stomata pores and N2 is obtained in combined
form, e.g. nitrates, through roots in dissolved form.

Why is respiration considered an exothermic process?

1

(a)

Respiration involves the breaking down of digested food using oxygen.As respiration produces a lot of energy in the form of ATP, this process is exothermic in nature

What is meant by 'translocation' with respect to transport in plants?

1

(a)

The transport of food from the leaves to the different parts of the plant is called translocation.

Name the term for transport of food from leaves other parts of the plant.

1

(a)

Translocation

Name the excretory unit of a kidney

1

(a)

Nephron