Question 1

Which of the following best explains why gram-negative bacteria are generally more resistant to antibiotics than gram-positive bacteria?

Accepted Answer

Gram-negative bacteria possess an outer membrane that restricts the entry of many antibiotics.

Question 2

A scientist discovers a unicellular organism living in a hot spring with a temperature of 90°C and high sulfur content. The organism lacks a nucleus and has unique membrane lipids. To which group does this organism most likely belong?

Accepted Answer

Archaea

Question 3

Which structure allows certain bacteria to survive harsh environmental conditions, such as extreme heat or desiccation, by forming a tough, protective shell?

Accepted Answer

Endospore

Question 4

A protist undergoes a life cycle in which both haploid and diploid multicellular stages are present. What is this type of life cycle called?

Accepted Answer

Alternation of generations

Question 5

Which of the following best describes the ecological role of fungi as decomposers in an ecosystem?

Accepted Answer

They break down complex organic matter, recycling nutrients back into the environment.

Question 6

Which of the following is NOT a key trait that defines a plant?

Accepted Answer

Presence of chitin in cell walls

Question 7

A botanist is examining a plant with parallel leaf veins, scattered vascular bundles in the stem, and a single cotyledon in the seed. To which group does this plant most likely belong?

Accepted Answer

Monocots

Question 8

Which plant cell type is primarily responsible for photosynthesis and storage, and is characterized by thin, flexible cell walls?

Accepted Answer

Parenchyma

Question 9

A plant cell is placed in a solution with a lower water potential than the cell's cytoplasm. What will most likely happen to the cell?

Accepted Answer

It will undergo plasmolysis.

Question 10

Which of the following equations correctly represents water potential ($$\Psi) in $$plant cells?

Accepted Answer

$$\Psi = \Psi_s + \Psi_p$$

Question 11

Which transport pathway in plants involves movement of water and solutes through the cell walls and extracellular spaces, without crossing any plasma membranes?

Accepted Answer

Apoplast

Question 12

A farmer notices that his crops are showing signs of nitrogen deficiency. Which process in the nitrogen cycle is most directly responsible for converting atmospheric nitrogen ($$N_2) $$into a form usable by plants?

Accepted Answer

Nitrogen fixation

Question 13

Which of the following best describes the function of xylem in vascular plants?

Accepted Answer

Transport of water and minerals from roots to shoots

Question 14

Which floral organ is directly involved in the production of pollen grains in angiosperms?

Accepted Answer

Anther

Question 15

Which of the following is a potential ecological risk associated with the widespread use of genetically engineered (GE) plants?

Accepted Answer

Development of herbicide-resistant weeds

Question 16

A plant species is found growing on the branches of trees, obtaining water and nutrients from the air and rain, but not harming the host tree. This plant is best described as a(n):

Accepted Answer

Epiphyte

Question 17

Which of the following best explains why bulk flow in the xylem is much faster than diffusion?

Accepted Answer

Bulk flow is driven by pressure differences, while diffusion relies on concentration gradients.

Question 18

Which of the following is a correct match between a plant organ and its primary function?

Accepted Answer

Stem – support and transport

Question 19

Which of the following best describes the difference between primary and secondary growth in plants?

Accepted Answer

Primary growth increases the length of stems and roots, while secondary growth increases their thickness.

Question 20

A plant is observed to have vascular bundles arranged in a ring, net-like leaf venation, and two cotyledons. Which group does this plant most likely belong to?

Accepted Answer

Dicots (Eudicots)

Biology Study Guide: Bacteria, Archaea, Protists, Fungi, and Plant Diversity

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