Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

Multiple choice botany photosynthesis electron transport system modern concept of photosynthesis photosynthesis in higher plants
Electron Transport System (ETS) is located in mitochondrial

  1. Outer membrane

  2. Inter membrane space

  3. Inner membrane

  4. Matrix
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An electron transport system (ETS) or electron transport chain (ETC) is a series of coenzymes and cytochromes that take part in the passage of electrons from one carrier to another and to its ultimate acceptor. The various components of ETS are arranged in five kinds of complexes, arranged in a definite sequence in the inner mitochondrial membrane.

So the correct option is C.

Multiple choice botany photosynthesis electron transport system modern concept of photosynthesis photosynthesis in higher plants

Cyclic photophosphorylation takes place in the thylakoid which lacks:

  1. Electron transport system

  2. Enzyme FNR(ferredoxin NADP reductase )

  3. Lumen
  4. Photosystem with absorption peak $700nm$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cyclic Photophosphorylation is the process, in which systems (like prokaryotes), just accomplishes the ADP to ATP for immediate energy for the cells. This type of photophosphorylation usually occurs in the thylakoid membrane. So the correct option is ' Electron transport system'.

Multiple choice botany photosynthesis electron transport system modern concept of photosynthesis photosynthesis in higher plants

Consider the following events in the photochemical conversion of light energy into chemical energy by chlorophyll during photosynthesis.
a. Charge separation
b. Absorption of a quantum of energy
c. Ejection of electron
d. Transfer of light energy
The correct sequence of these events is?

  1. $4, 2, 1, 3$
  2. $4, 2, 3, 1$
  3. $2, 4, 1, 3$
  4. $2, 4, 3, 1$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The correct sequence is: 1. Absorption of light energy (2), 2. Transfer of light energy (4), 3. Charge separation (1), 4. Ejection of electron (3).

Multiple choice botany photosynthesis electron transport system modern concept of photosynthesis photosynthesis in higher plants
Which range of wavelength (in nm) is called photosynthetically active radiation (PAR)? 

  1. 100-390

  2. 390-430

  3. 400-700

  4. 760-10,000
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sunlight or solar radiations reaching the earth have wavelength between 300 nm (in the ultra volt rang) to 2600 nm (in the infa-red range). Part of the spectrum used in photosynthesis has a wavelength between 400-700 nm, it is called as photo synthetically active radiation (PAR). 

Multiple choice botany root - external morphology zones of the root morphology of root root system in plants

Choose the incorrect statement.

  1. Epiphytic roots and Vanda has well developed root cap and root hair

  2. Tinospora and Trapa possess assimilatory roots

  3. Cuscuta is a parasitic plant

  4. Saccharum and Zea mays possess still toots
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Epiphytic roots (like those in Vanda) are hygroscopic and lack root hairs and a true root cap; instead, they possess a velamen tissue for moisture absorption. The other statements correctly describe Tinospora/Trapa, Cuscuta, and Saccharum/Zea mays.

Multiple choice botany root - external morphology zones of the root morphology of root root system in plants

Hairy root disease of dicot plants is caused by

  1. Agrobacterium tumefaciens

  2. Agrobacterium rhizogene

  3. Bacillus thuringiensis

  4. Meloidogyne incognita
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • A soil bacterium Agrobacterium rhizogenes causes “hairy root” disease in some dicotyledonous plants(For example, capsicum species).
  • A bacterial Ri (root inducing) plasmid integrates its transfer-DNA (T-DNA) into the plant genome (DNA). As a result, rapidly growing and intensely branched (hairy) adventitious roots are developed.
  • Hence Hairy root disease of dicot plants is caused by Agrobacterium rhizogene.
  • So, the correct answer is 'Agrobacterium rhizogene'.
Multiple choice botany root - external morphology zones of the root morphology of root root system in plants

Clowes observed a central cup like region of passive cells in the root tip of Zea mays which lies in between?

  1. Root cap and active root meristem

  2. Protoderm and procambium

  3. Cork cambium and quiescent centre

  4. Quiescent centre and calyptrogen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The quiescent centre is a region of inactive or slowly dividing cells located between the root cap (calyptra) and the active root apical meristem. It serves as a reservoir of cells to replace damaged meristematic cells.

Multiple choice botany root - external morphology zones of the root morphology of root root system in plants

Root cap is absent in

  1. Hydrophytes

  2. Lithophytes

  3. Xerophytes

  4. Mesophytes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Root caps are present in terrestrial plants to protect the root tip from breaking away as they grow deeper through the layers of the soil. However,the roots of hydropytes that are floating or submerged do not have to grow through the abrasive layers of soil, as the roots are floating in water or the soil is soft and water logged.

So, the correct answer is 'Hydrophytes'