Tag: biology

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Questions Related to biology

Multiple choice biology classification of plants importance and classification of angiosperms plant adaptation adaptation in plants

Both a dicot root and monocot root possess six vascular bundles. The two can be distinguished by.

  1. Presence of lysigenous cavity in monocot root

  2. Occurrence of more metaxylem vessels in dicot root

  3. Presence of exarch condition in monocot root

  4. Outline of vessels
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dicot root and monocot root differ on the activity of pericycle, a number of vascular bundles and the presence of medulla. In both dicot root and monocot root, six vascular bundles are present, they distinguished by thickness of cell walls or outlines of vessels.

So, the correct option is ‘Outlines of vessels’.

Multiple choice biology classification of plants importance and classification of angiosperms plant adaptation adaptation in plants

Monocot root differs from dicot root in having.

  1. Open vascular bundles

  2. Scattered vascular bundles

  3. Well developed pith

  4. Radially arranged vascular bundles
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Dicot root and monocot root differ on the activity of pericycle, the number of vascular bundles and the presence of medulla. In monocot root, the medulla is well developed, whereas, in dicot root, it is reduced, due to the extensions of xylem strands

So, the correct option is ‘Well developed pith’

Multiple choice biology kingdom plantae importance and classification of angiosperms plant adaptation adaptation in plants

Pick the odd one out

  1. Paddy

  2. Groundnut

  3. Maize

  4. Peas
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The cropping is categorized into two main types kharif and rabi on the basis of the monsoon season. The Kharif crops are typically monsoon crops as the cropping season is started from July –October at the time of the south-west monsoon and the Rabi crops are non-monsoon crops and the cropping season is from October-March (winter). The Kharif crops include paddy, maize, groundnut (oilseeds), etc; while, the pea is a rabi crop. 

So, the correct answer is option D, Peas. 

Multiple choice biology micro - organisms: a wonderful world diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

How does Paramecium look under compound microscope?

  1. Oval

  2. Irregular

  3. Circular

  4. Long thread like
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Paramecium is a unicellular ciliated protozoan. It looks an oval, slipper-shaped micro-organism when observed under a microscope, rounded at the front/top and pointed at the back/bottom. It can also be seen by naked eyes.

Multiple choice biology micro - organisms: a wonderful world diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

A Paramoecium reproduces by 

  1. Budding

  2. Laying eggs

  3. Preparing spores

  4. Cell division
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In Paramoecium, reproduction takes place by binary fission method. At first, micronucleus divides into 2 nuclei by mitosis. The cytopharynx also divides into 2 parts. The cytoplasm is also divided into 2 parts. Then transverse constriction is made from two sides. New contractile vacuoles are formed. The constriction meet at centre and two daughter paramecia reproduced. Thus, the correct answer is option D.

Multiple choice biology micro - organisms: a wonderful world diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

The microorganism known as pond scum is autotrophic due to the presence of 

  1. Carotene

  2. Chlorophyll

  3. Melanin

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pond scum is a massive growth of algae on the surface of the pond or any stagnant water source. They are autotrophic in nature due to the green compound present which helps in photosynthesis, these pigments are called chlorophyll.

So, the correct option is 'Chlorophyll'.

Multiple choice biology wastewater story personal and public cleanliness who will do this? basics of water pollution

Study the following statements about ozone:
(a) It is essential for the breathing of living organisms.
(b) It is used to disinfect water.
(c) It absorbs ultraviolet rays.
(d) Its proportion of air is about 3%. Which of these statements are correct?

  1. (a), (b) and (c) 

  2. (b) and (c)

  3. (a) and (d)

  4. All four 
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Ozone, or trioxygen, is an inorganic molecule with the chemical formula $O _3$. It is a pale blue gas with a distinctively pungent smell.
  • Oxygen is essential for the breathing of living organisms. Hence statement (a) is incorrect.
  • Ozone is a powerful oxidant, stronger than chlorine. Ozone is used to disinfect, deodorize, decolourize and decompose organic substances in water. Hence Statement (b) is correct.
  • The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. Hence statement (c) is correct.
  • The proportion of ozone in the air is 0.000004%. Hence Statement (d) Is incorrect.
  • So, the correct answer is '(b) and (c)'.