Basic Science — Web Mentor

Question 1

What planet is known as the Red Planet?

Venus Mars Jupiter Mercury

Question 2

A healthy green plant is supplied with water, minerals, chlorophyll, and sunlight, but carbon dioxide is completely removed from its surroundings. Which process will be directly affected?

Respiration Germination Photosynthesis Transpiration

Question 3

A scientist blocks the xylem vessels of a plant without affecting the phloem. Which event is most likely to occur first?

Food cannot move to roots Water cannot reach the leaves Seeds stop germinating Flowers stop producing pollen

Question 4

Why is iodine used after removing chlorophyll from a leaf during the starch test?

To remove water To colour chlorophyll To detect stored starch To increase photosynthesis

Question 5

A cactus has very small leaves modified into spines. How does it continue to prepare food?

Roots perform photosynthesis Flowers perform photosynthesis Green stem performs photosynthesis Fruits prepare food

Question 6

Which statement correctly explains why guard cells are important?

They absorb minerals They manufacture starch They regulate the opening and closing of stomata They transport food

Question 7

A potted plant is placed in complete darkness for one week but watered regularly. Which statement is correct?

Photosynthesis continues normally Respiration stops Photosynthesis stops, but respiration continues Both photosynthesis and respiration stop

Question 8

Which pair of processes mainly depends on stomata?

Germination and pollination Photosynthesis and transpiration Fertilisation and seed dispersal Growth and flowering

Question 9

Food moves in both upward and downward directions inside plants because

Xylem carries food Phloem transports food in both directions Guard cells push food Chlorophyll stores food

Question 10

A student says, 'Photosynthesis cannot occur without oxygen.' Which response is correct?

The statement is correct Oxygen is required before photosynthesis begins Oxygen is actually produced during photosynthesis Oxygen is stored inside chlorophyll

Question 11

Which condition would reduce transpiration the most?

Wide open stomata Bright sunlight Closed stomata High temperature

Question 12

Why is chlorophyll called an essential pigment?

It absorbs minerals It absorbs sunlight needed for photosynthesis It transports water It stores oxygen

Question 13

Which process mainly helps pull water from roots to leaves?

Pollination Transpiration Fertilisation Diffusion

Question 14

If phloem is damaged while xylem remains healthy, the plant will still

Transport food normally Absorb water from the soil Distribute glucose to all parts Stop photosynthesis immediately

Question 15

Which observation proves that osmosis has taken place in the potato experiment?

Potato changes colour Sugar solution level rises Water turns blue Potato becomes heavier due to minerals

Question 16

Which gas enters a leaf during photosynthesis but leaves the leaf during respiration?

Carbon dioxide Oxygen Nitrogen Both A and B, depending on the process

Question 17

Why are root hairs numerous and very thin?

To store starch To increase the surface area for water absorption To perform respiration To make chlorophyll

Question 18

Which statement about xylem is FALSE?

It transports water It transports minerals Its movement is bidirectional It forms part of the vascular system

Question 19

A student removes all leaves from a plant. Which function is most immediately affected?

Seed formation Food preparation Root growth Mineral absorption

Question 20

Which process releases energy stored in glucose?

Photosynthesis Respiration Transpiration Osmosis

Question 21

Which statement best explains why plants need both xylem and phloem?

Both transport only water Xylem transports food while phloem transports water Xylem transports water and minerals, while phloem distributes food throughout the plant Both perform photosynthesis