Tag: botany

Questions Related to botany

Lenticles are involved in

botany movement in and out of the cell diffusion transport in vascular plants types of transport

  1. Photosynthesis.

  2. Transpiration.

  3. Gaseous exchange.

  4. Food transport.

Show answer
Correct Option: C
Explanation:

Lenticels are involved in gaseous exchange between internal tissues and atmosphere. These are porous tissues present in periderm that are developed during secondary growth.

Thus, the correct answer is option C.

In which part of the plant, the rate of respiration is higher?

botany movement in and out of the cell diffusion transport in vascular plants types of transport

  1. Root and stem tip

  2. Buds

  3. Germinating seeds

  4. All of the above

Show answer
Correct Option: D
Explanation:

The highest rate of respiration are found in the actively growing root and stem tips, cambium and embryos of germinating seeds and lowest rates in dormant seeds or spores. As, the growing tips are generally rich in meristematic tissues the rate of respiration is also high.

Which of the following features does all gas exchange have in common?

botany movement in and out of the cell diffusion transport in vascular plants types of transport

  1. They are enclosed within ribs.

  2. They are maintained at constant temperature.

  3. The exchange surfaces are moist.

  4. They are exposed to air.

Show answer
Correct Option: C
Explanation:

Out of all the options given the third option is the correct one.
Exchange of gases is a feature that is common in all living things. Irrespective of the genera of living organisms,  all organs that exchange gases are characterized by features such as- thin, moist, large surface area and a large capillary network.

Correct statement is 

botany movement in and out of the cell diffusion transport in vascular plants types of transport

  1. Roots of plant respire through lenticels and stomata.

  2. Stem of plant respire through lenticels.

  3. Both A and B are correct.

  4. None of the above.

Show answer
Correct Option: B
Explanation:

All parts of the plant respire, the leaves, the stem, the roots and even the flowers. The parts above the soil get their oxygen directly from the air through pores. The pores in the leaves are called stomata. The pores in stems of trees are called lenticels.

During night, a person should not sleep under a tree because the tree

botany movement in and out of the cell diffusion transport in vascular plants types of transport

  1. Releases O$ _2$ during night.

  2. Does not release CO$ _2$ during night.

  3. Releases CO$ _2$ during night.

  4. Releases water during guttation.

Show answer
Correct Option: C
Explanation:

Photosynthesis does not take place in plants during night time as the sunlight is absent and the accumulation of carbon dioxide is more. we feel suffocated if we sleep under trees during night times are more carbon dioxide is present around the trees.

So the correct option is 'Releases CO$ _2$ during the night.'

Stomata perform the function of

botany movement in and out of the cell diffusion transport in vascular plants types of transport

  1. Gaseous exchange

  2. Oxygen evolution

  3. Carbon dioxide evolution

  4. $CO _2$ absorption.

Show answer
Correct Option: A
Explanation:
The stomata control gas exchange in the leaf. Each stoma can be open or closed, depending on how turgid its guard cells are. In the light, the guard cells absorb water by osmosis, become turgid and the stoma opens. In the dark, the guard cells lose water, become flaccid and the stoma closes.
So, the correct answer is 'Gaseous exchange'.

Read the following statements about the reproductive cycles in mammals and select the correct ones.
(i) Oestrous cycle occurs in primate mammals.
(ii) In species with oestrous cycle, females are generally sexually active during oestrous phase.
(iii) Both the cycles show monthly recurrence.

botany modes of reproduction sexual reproduction in organisms sexual reproduction & its importance reproduction in organisms

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (ii) only

  4. (i), (ii) and (iii)

Show answer
Correct Option: C
Explanation:

Oestrous cycle occur in non-primates such as cows, dogs, etc. Menstrual cycle occurs in primates only. Menstrual cycle shows monthly recurrence but oestrous cycle does not.

So, the correct answer is '(ii) only

Oestrous cycle is reported in

botany modes of reproduction sexual reproduction in organisms sexual reproduction & its importance reproduction in organisms

  1. Cows and sheep

  2. Humans and monkeys

  3. Chimpanzees and gorillas

  4. None of these

Show answer
Correct Option: A
Explanation:
The females of placental mammals exhibit cyclical changes in the activities of ovaries and accessory ducts as well as hormone during the reproductive phase.
-In non-primate mammals like cows, sheep, deer, dog, tiger, etc., such cyclical changes during reproduction are called oestrus cycle whereas in primates ( monkey, apes and humans)  such cyclical changes are called Menstrual cycle.
So, the correct answer is 'Option A- Cows and sheep'.

The word estrus means

botany modes of reproduction sexual reproduction in organisms sexual reproduction & its importance reproduction in organisms

  1. Heat

  2. Blood

  3. Hormone

  4. None of the above

Show answer
Correct Option: A
Explanation:

The reproductive cycle of the non-primate females is called oestrous cycle. For example, in rats, horse etc. It can be divided into four phases proestrus, estrus, metestrus and diestrus. The word estrus means heat. It is a sign of sexual receptivity and fertility.

So, the correct option is A.

Monoestrous  and diestrous can be differentiated by

botany modes of reproduction sexual reproduction in organisms sexual reproduction & its importance reproduction in organisms

  1. Breeding cycle

  2. Reproductive cycle

  3. Ornithine cycle

  4. None of the above

Show answer
Correct Option: A
Explanation:

On the basis number of estrous cycle (breeding cycle), females of some species can be monoestrous and diestrous. Monoestrous animals are those in which only one estrous cycle can be seen in a year. For example, dogs, fox etc. Whereas, diestrous animals are those in which two estrous cycles are seen in a year. For example, horse, goats etc. So, the correct option is A.