Tag: botany

Questions Related to botany

Proestrus bleeding in dogs is caused due to 

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

  1. Increase of the estradiol-17 hormone

  2. Inflammatory response of WBC

  3. Ovulation

  4. All of the above

Show answer
Correct Option: A
Explanation:

The reproductive cycle of the non primate females is called estrous cycle. It can be divided into four phases: proestrus, estrus, metestrus and diestrus. Proestrus stage is the building up phase. There is bleeding found in dogs during the proestrus phase. There is increase in the level of estradiol-17 hormone. This results in the movement or diapedesis of the red blood cells in the blood vessels which causes bleeding. 

Thus, the correct answer is option A. 

The female cat stays in heat for

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

  1. 18-21 days

  2. 16-21 days

  3. 14-21 days

  4. None of the above

Show answer
Correct Option: C
Explanation:
  • Estrus is the period in the sexual cycle of female mammals, except the higher primates, during which they are in heat—i.e., ready to accept a male and to mate.
  • The female cat stays in heat for 14-21 days i.e. it is ready to mate for this duration.
  • So, the correct option is '14-21 days'.

A difference between estrous and menstrual cycles is that

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

  1. Non-mammalian vertebrates have estrous cycles, whereas mammals have menstrual cycles

  2. The endometrial lining is shed in menstrual cycles but reabsorbed in estrous cycles

  3. Estrous cycles occur more frequently than menstrual cycles do

  4. Ovulation occurs before the endometrium thickens in estrous cycles

Show answer
Correct Option: B
Explanation:

Menstrual cycle occurs in primates (monkeys, apes and human beings). This cycle consists of the menstrual phase, the proliferative phase and the secretory phase and the broken endometrium is passed out during menstruation. The oestrous cycle occurs in non-primates such as cows, dogs, etc. It consists of a short period of estrus or heat followed by anoestrus or passive period. The broken endometrium is reabsorbed during the oestrous cycle.

So the correct option is 'the endometrial lining is shed in menstrual cycles but reabsorbed in the oestrous cycle'.

The limited period of sexual receptivity that occur around the time of ovulation in all female mammals, except human, is called

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

  1. Oogenesis

  2. Menstruation

  3. Estrus

  4. Puberty

Show answer
Correct Option: C
Explanation:

Estrus is the period in the sexual cycle of female mammals, except humans during which they are in heat, i.e ready to mate. Prior to ovulation, the endometrium (uterine lining) thickens, in preparation for holding the fertilized ova. As the proliferation of uterine tissue reaches its peak, receptivity is the highest which is called the oestrous period. The period of sexual receptivity is primarily initiated by the elevation in estrogens from mature follicles just prior to ovulation. The basic pattern of the oestrous cycle is the same in all domestic animals, but some specific differences are found in specific parts of the cycle. 

So the correct option is 'estrus'.

In a biological community, Gauze's principle explains.

botany taxonomy and systematic botany life introduction to plant kingdom classification of organisms

  1. Competition among different species under unlimited resources

  2. Competitive exclusion of an inferior species due to the limited natural resources

  3. Coexistence of closely related species due to resource partitioning

  4. Intra specific competition due to limited natural resources

Show answer
Correct Option: A

Which one of the following statements is incorrect about the occurrence of notochord?

botany taxonomy and systematic botany life introduction to plant kingdom classification of organisms

  1. It is present only in larval tail in ascidian.

  2. It is replaced by a vertebral column in adult frog.

  3. It is absent throughout life in humans from the very beginning.

  4. It is present throughout life in Amphioxus.

Show answer
Correct Option: C
Explanation:

Humans belong to the Phylum Chordate. Animals belonging to the Phylum Chordata possess a notochord either during early embryonic life or throughout the embryonic life. In some, it Is replaced by vertebral column. In humans, notochord is present only In the embryonic stage, it is replaced by vertebral column in the adult form.

Read the following matches.

(i) Guava Spiral phyllotaxy
(ii) Ruscus Cladode
(iii) Opuntia Phylloclade's
(iv) Mustard Spiral phyllotaxy


Which of these are correct?

botany leaf - external morphology venation arrangement of leaves morphology of leaf

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

  2. (ii), (iii) and (iv)

  3. (i), (iii) and (iv)

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

Show answer
Correct Option: B
Explanation:

1) Guava- Opposite phyllotaxy

2) Ruscus- Cladode
3) Opuntia- Phylloclade
4) Mustard- Alternate/spiral phyllotaxy


So the correct option is " B) ii, iii, iv". 

Reticulate venation is not seen in _________.

botany leaf - external morphology venation arrangement of leaves morphology of leaf

  1. Mango

  2. Maize

  3. Sunflower

  4. Hibiscus

Show answer
Correct Option: B
Explanation:
In reticulate venation, the veins branch and unite forming a complicated network. All the veins are interconnected, like the strands of the net.
Leaves of dicot plants generally have reticulate venation. Maize is a monocot and hence shows only parallel venation.
So, the correct option is 'Maize'.

Veins are _________ strands on the lamina.

botany leaf - external morphology venation arrangement of leaves morphology of leaf

  1. Conducting

  2. Transpirational

  3. Exceptional

  4. Flattened

Show answer
Correct Option: A
Explanation:

Veins provide support for the leaf and transport both water and minerals (via xylem) and food energy (via phloem) through the leaf and on to the rest of the plant and hence are conducting in their function.

So, the correct option is 'Conducting'.

Parallel venation is a characteristic feature of ..........

botany leaf - external morphology venation arrangement of leaves morphology of leaf

  1. Monocotyledon

  2. Dicotyledon

  3. Pteridophytes

  4. Bryophytes

Show answer
Correct Option: A
Explanation:


Parallel venation, in which veins run parallel to one another from base to the tips of the leaf. Reticulate venation in which veins are arranged in a net like a pattern on both sides.

Name of the organism  Type of venation
Monocotyledons Parallel
Dicotyledons Reticulate
Pteridophytes Reticulate 
Bryophytes The plant body is not differentiated into root, stem, leaves, lack vascular tissue( Xylem and phloem) and there are no veins i.e. .conducting lines, so venation is not present.

So, the correct option is ' Monocotyledonae '