Question 1

Which of the following best describes the function of sieve-tube elements in the phloem of plants?

Accepted Answer

They transport sugars and other organic nutrients throughout the plant.

Question 2

A botanist observes a tree increasing in girth (width) over several years. Which tissue is primarily responsible for this secondary growth, and what is its main function?

Accepted Answer

Vascular cambium; it produces new xylem and phloem cells.

Question 3

Which of the following best explains how water moves upward through the xylem in tall trees?

Accepted Answer

Transpiration creates a negative pressure, and cohesion and adhesion of water molecules pull water upward.

Question 4

A plant root absorbs water and minerals from the soil. Which structure ensures that only selected substances enter the plant's vascular system?

Accepted Answer

Casparian strip

Question 5

Which of the following is a primary function of the ovary in a flowering plant?

Accepted Answer

To protect the seed and develop into fruit for seed dispersal.

Question 6

Which of the following statements about plant macronutrient absorption is correct?

Accepted Answer

Plants absorb carbon from $$\mathrm{CO_2$} in $$the air, while oxygen, hydrogen, and nitrogen are absorbed from the soil.

Question 7

Which of the following best describes the role of mycorrhizae in plant nutrition?

Accepted Answer

They increase the surface area for water and mineral absorption by forming a symbiotic relationship with plant roots.

Question 8

Which of the following is a distinguishing characteristic of arthropods?

Accepted Answer

Segmented bodies with jointed appendages and an exoskeleton made of chitin.

Question 9

Which of the following features is present in all chordates at some stage of their development?

Accepted Answer

A notochord, dorsal hollow nerve cord, pharyngeal slits, and post-anal tail.

Question 10

Which of the following statements about invertebrates is correct?

Accepted Answer

Arthropods are the most abundant group of invertebrates.

Question 11

Which of the following is a defining characteristic of vertebrates?

Accepted Answer

A backbone or vertebral column that replaces the notochord during development.

Question 12

Which of the following animals is ectothermic and relies on external sources to regulate its body temperature?

Accepted Answer

Lizard

Question 13

Which two features are unique to mammals among vertebrates?

Accepted Answer

Hair and mammary glands

Question 14

Which of the following is a characteristic present in most fish but not in sharks and rays?

Accepted Answer

Operculum and swim bladder

Question 15

A scientist discovers a new animal with a cartilaginous skeleton, no swim bladder, and gill slits not covered by an operculum. To which group does this animal most likely belong?

Accepted Answer

Sharks and rays

Question 16

Which of the following is a defining feature of tetrapods?

Accepted Answer

Four limbs adapted for life on land

Question 17

Which of the following best explains how phloem transports sugars from leaves to roots?

Accepted Answer

Sugars are actively transported into sieve-tube elements, creating a pressure gradient that moves water and sugars toward sink cells.

Question 18

Which of the following best describes the role of bacteria and fungi in fertilizing topsoil?

Accepted Answer

They decompose organic matter, releasing nutrients that plants can absorb.

Question 19

Which of the following is a characteristic of flatworms?

Accepted Answer

Bilateral symmetry and a gastrovascular cavity with only one opening

Question 20

A plant is unable to grow taller but continues to increase in girth. Which meristem is still active, and which is inactive?

Accepted Answer

Vascular cambium is active; apical meristem is inactive.

Plant Structure, Growth, Nutrition, and Animal Diversity: Key Concepts and Features

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