Tag: biology

Questions Related to biology

Breeding for disease resistance requires

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

  1. A good source of resistance

  2. Planned hybridisation

  3. Disease test

  4. All the above.

Show answer
Correct Option: D

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

  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.

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Correct Option: C

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

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

  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

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Correct Option: A

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

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

  1. True

  2. False

  3. Ambigous

  4. Data insufficient

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Correct Option: A
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.

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

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

  1. plymouth rock

  2. white leghorn

  3. aseel

  4. rhode island red

Show answer
Correct Option: C
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. 

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

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

  1. Sahiwal

  2. Karan-Swiss

  3. Tharparkar

  4. Jersey.

Show answer
Correct Option: B
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.

Which pathogen causes the blast disease of rice?

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

  1. Cercospora personata

  2. Pyricularia oryzae

  3. Xanthomonas citri

  4. Tungro virus

Show answer
Correct Option: B
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.

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

biology seeds - structure and germination what is a seed? seeds seed

  1. Germinated pollen grain

  2. Embryo

  3. Unfertilized ovule

  4. Seed

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Correct Option: D

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

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

  1. Heart

  2. Lungs

  3. Both (1) and (2)

  4. Kidneys

Show answer
Correct Option: C
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'.

Opening and closing of stomata is controlled by

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

  1. $K^{+}$

  2. $Mg^{2+}$

  3. $Ca^{2+}$

  4. None of the above

Show answer
Correct Option: A
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.