Biology - Mock Test 234

Question 2331

Pressure flow theory was proposed by?

A) H-Van Mohl B) Dixon C) Vander wall. D) Earnst Munch

---

No Details

Question 2332

Pulling upward of water and dissolved minerals towards the leaves through the xylem tissue is called?

A) Transpiration pull B) Root pressure C) Ascent of sap. D) All of these

---

No Details

Question 2333

Transport of minerals from soil to epidermal cells of roots via carrier protein molcules along their concentration gradient is called?

A) Diffusion. B) Facilitated diffusion. C) Passive transport. D) Active transport.

---

No Details

Question 2334

Symbionts which help plants in uptake of phosphorous and trace metals such as zinc and copper?

A) Rhizome B) Viruses C) Fungi D) Cyanobacterid

---

No Details

Question 2335

The opening and closing of stomata is directly controlled by the?

A) Temperature B) pH C) Light D) None of these

---

No Details

Question 2336

Low level of CO2 favours _____ of the stomata?

A) Opening B) Closure C) Both of these D) None of these

---

No Details

Question 2337

Stomata open due to _____ of K+ into the guard cells from the surrounding epidermis?

A) Diffusion B) Active transport C) Osmosis D) All of these

---

No Details

Question 2338

There are _______ hypothesis which may explain opening and closing of stomata?

A) One B) Two C) Three D) Four

---

No Details

Question 2339

They function as multisensory hydraulic valve?

A) Lenticels B) Guard cells C) Hydathods D) All of these

---

No Details

Question 2340

Stomatal transpiration is _____ of total transpiration?

A) 90% B) 91% C) 93% D) 95%

---

No Details