Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology breeding and biotechnology method of plant breeding for crop improvement plant breeding for food production biotechnology

Breeding for disease resistance requires

  1. A good source of resistance

  2. Planned hybridisation

  3. Disease test

  4. All the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Breeding for disease resistance is a comprehensive process that requires identifying a source of resistance, planning the hybridization, and rigorously testing the progeny for resistance.

Multiple choice biology breeding and biotechnology method of plant breeding for crop improvement plant breeding for food production biotechnology

Match the columns:

I II
a Mutation breeding 1 Johannsen
b Inbreeding depression 2 Karpechenko
c Pureline selection 3 Darwin
d Intergeneric hybridization 4 Staddler
5 Shull

  1. a-4, b-2, c-5, d-1

  2. a-4, b-5, c-2, d-1

  3. a-4, b-5, c-1, d-2

  4. a-5, b-4, c-1, d-2.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mutation breeding is associated with Staddler (4), Inbreeding depression with Shull (5), Pureline selection with Johannsen (1), and Intergeneric hybridization with Karpechenko (2).

Multiple choice biology breeding and biotechnology method of plant breeding for crop improvement plant breeding for food production biotechnology

The Ear cockier of wheat can be differentiated from Molya disease of wheat by the fact that in the former.

  1. Plants become dwarf, stem and leaves become twisted spike lets get distorted and grains get replaced by brown stony structures

  2. Plants become pale, leaves turn yellow with reddish lip, roots get matted and fail to ear

  3. Root tips swell and cyst adheres to roots that turn brown and fall

  4. Show hypertrophy of stern and leaves and roots swell
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ear cockle of wheat is caused by the nematode Anguina tritici, which causes the formation of galls (brown stony structures) in place of grains and distorts the spikelets.

Multiple choice biology breeding and biotechnology method of plant breeding for crop improvement plant breeding for food production biotechnology

State whether the following statement is true or false.
Ability of an organism to resist disease is called as host resistance.

  1. True

  2. False

  3. Ambigous

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

Ability of an organism to resist disease is called host resistance. These plant varieties are developed under Integrated Pest Management to provide resistance against a particular variety of pest. 

Example Bt Cotton a transgenic plant which has resistance to a certain kind of disease called the boll disease.
So, the given statement is true.

Multiple choice biology breeding and biotechnology method of plant breeding for crop improvement plant breeding for food production biotechnology

Which one of the following is the indigenous breed of chickens ?

  1. plymouth rock

  2. white leghorn

  3. aseel

  4. rhode island red
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Aseel is a pure indigenous breed of chicken originated from India and Pakistan. They are used for cock fighting. They are very large breed of chicken from subcontinents. This breed is good in high yield of meat but it is not good for egg production. The average weight of cock varies from 4 to 5 kg and hens 3 to 4 kg. 

Multiple choice biology breeding and biotechnology method of plant breeding for crop improvement plant breeding for food production biotechnology

Which one of following breeds of cattle is a cross-breed and high milk yielding ?

  1. Sahiwal

  2. Karan-Swiss

  3. Tharparkar

  4. Jersey.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Karan Swiss is the hybrid variety and high milk yielding breed of cow. It is the hybrid breed of Taurine and Zebu. Taurine is used for milk production, while Zebu is used for flesh.

Multiple choice biology breeding and biotechnology method of plant breeding for crop improvement plant breeding for food production biotechnology

Which pathogen causes the blast disease of rice?

  1. Cercospora personata

  2. Pyricularia oryzae

  3. Xanthomonas citri

  4. Tungro virus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Blast disease in rice is caused by the fungus Magnaporthe oryzae which was earlier known as Pyricularia oryzae. Different parts of the plants are affected by the fungus. The blast can occur wherever blast spores are present. Rice can have blast in all growth stages. There are lesions formed on the leaf, panicle and neck region of the plant. There is great loss in yield due to this disease affecting the rice plants.
Thus, the correct answer is option B.
Multiple choice biology seeds - structure and germination what is a seed? seeds seed

The plant part which consists of two generations one within the other, is ____________.

  1. Germinated pollen grain

  2. Embryo

  3. Unfertilized ovule

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

A seed contains the embryo (new generation) and the seed coat/endosperm (remnants of the parent plant/previous generation), effectively housing two generations.

Multiple choice biology respiration in organism human respiration the mechanism of breathing breathing and its movements

During running or cycling ,Which of the following organs have to increase their activity

  1. Heart

  2. Lungs

  3. Both (1) and (2)

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

During any physical exercise such as running or cycling the two vital organs of our body heart and lungs come into action since lung try to bring oxygen into the body to provide energy and side by side removing carbon dioxide formed by strenuous physical activity. While the heart pumps oxygen-rich blood to skeletal muscle undergoing physical exercise to meet their metabolic requirements.

Thus, the correct answer is  'Both (1)-Heart and (2)-Lungs'.

Multiple choice blackman's principle of limiting factors photosynthesis in higher plants biology

Opening and closing of stomata is controlled by

  1. $K^{+}$
  2. $Mg^{2+}$
  3. $Ca^{2+}$

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

Potassium ions are involved in turgor movement of guard cells. Formation of organic acids like malic acid in guard cells promotes intake of potassium into the guard cells, which causes a decrease in water potential leading to intake of water by guard cells.