Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

Multiple choice botany environmental factors environmental factors and their measurements climate factors marine life

The following evidences rejected with atmospheric pressure theory. Which of them is incorrect ?

  1. It can raise water to height of 33 feet only if complete vaccum is created.

  2. Free surface of water is required for proper operation of atmospheric pressure because of transpiration.

  3. Pressure falls below that of atmospheric pressure because of transpiration.

  4. Water rises rapidly to compensate the water loss because of atmospheric pressure.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The question is poorly phrased, but option B is the most scientifically inaccurate statement regarding atmospheric pressure and transpiration in plants.

Multiple choice botany pollination, fertilization and development of endosperm and embryo fruits and seeds fruit and its type fertilization events

Endosperm, a product of double fertilisation in angiosperms is absent in the seeds of

  1. Coconut

  2. Orchids

  3. Maize

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

Orchid seed is a non-endospermic seed, i.e., endosperm is absent in it. Endosperm is a nourishing tissue present in the seed which nourishes the developingembryo. In orchid seed endosperm is absent because it is used up during the time ofseed development. Nourishment for germinating seed is provided by the food material present in cotyledons. 


Rest of the options are examples of endospermic seeds.

Multiple choice botany pollination, fertilization and development of endosperm and embryo fruits and seeds fruit and its type fertilization events

The mature seeds of plants such as gram and peas, possess no endosperm, because

  1. these plants are not angiosperms

  2. there is no double fertilisation in them

  3. endosperm is not formed in them

  4. endosperm gets used up by the developing embryo during seed development.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Gram and pea both are dicot seeds. Cotyledons take up most of the space in the seed and these cotyledons become filled with the material that will nourish the growing embryo. therefore the endosperm is used up by the developing embryo.

So, the correct option is endosperm gets used up by the developing embryo during seed development.
Multiple choice botany pollination, fertilization and development of endosperm and embryo fruits and seeds fruit and its type fertilization events

Endospermic seeds are found in

  1. Barley

  2. Castor

  3. Pea

  4. Both (a) and (b)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Those seeds in which the endosperm persists even after germination are called endospermous seeds. Barley and castor are examples of monocot and dicot endospermous seeds respectively.

So, the correct answer is 'Both (a) and (b)'

Multiple choice botany pollination, fertilization and development of endosperm and embryo fruits and seeds fruit and its type fertilization events

Careals, castor and coconut possess ______ seeds.

  1. Endospermic

  2. Zoospermic

  3. Non-albuminous

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

If the endosperm exists after the seed has germinated then the seeds are referred to as endospermous seeds, this could be due to greater synthesis or lesser utilization by the developing embryo.

Examples, cereals, castor and coconut
So, the correct answer is 'Endospermic'

Multiple choice botany pollination, fertilization and development of endosperm and embryo fruits and seeds fruit and its type fertilization events

Endosperm is completely consumed by the developing embryo in

  1. Pea and groundnut

  2. Maize and castor

  3. Castor and groundnut

  4. Maize and pea
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In pea and groundnut, endosperm is consumed by developing embryo in the seed. The endosperm is completely absorbed by the growing embryo and the food reserve gets stored in the cotyledons. Such seeds are called non-endospermic or exalbuminous.

So, the correct option is 'Pea and groundnut'.

Multiple choice botany pollination, fertilization and development of endosperm and embryo fruits and seeds fruit and its type fertilization events

Endospermic seeds are found in.

  1. Castor

  2. Barley

  3. Coconut

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Endospermic seeds are those that have an endosperm in the mature seed. It is fleshy, oily, surrounds the embryo, and functions as the sole food storage organ. Inside the seed coat, a thin and papery cotyledon is present. Monocot plants have endospermic seeds.
So, the correct option is 'All of these'.
Multiple choice botany pollination, fertilization and development of endosperm and embryo fruits and seeds fruit and its type fertilization events

In albuminous seeds, food is stored in ________ and in non-albumious seeds, it is stored in ___________.

  1. Endosperm, cotyledons

  2. Cotyledons, endosperm

  3. Nucellus, cotyledons

  4. Endosperm, radicle
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Albuminous seeds are the seeds which have food stored in the special nourishing tissue called as endosperm that remains persistent till maturity. Cotyledons only act as food sucking organs and not food storage organs e.g., Castor seed. Non-albuminous seeds are the seeds which have the stored food and the cotyledons in a special structure called as a kernel. It does not remain until the embryo is mature. e.g. Pea seed.
So, the correct option is 'Endosperm, cotyledons'.
Multiple choice botany pollination, fertilization and development of endosperm and embryo fruits and seeds fruit and its type fertilization events

In which one of the following, would you expect to find glyoxysomes?

  1. Endosperm of wheat

  2. Endosperm of castor

  3. Palisade cells in leaf

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

Glyoxysomes are microbodies. These microbodies occur only in fat rich plant cells like castor seeds where they take part in $\beta$-oxidation of fats and perform glyoxylate cycle. Glyoxysomes possess catalase enzyme.

Multiple choice botany pollination, fertilization and development of endosperm and embryo fruits and seeds fruit and its type fertilization events

Assertion (A). All the fruits that we eat are not real fruits.
Reason (R). In few plants, floral parts like thalamus or pedicel also, contribute to fruit formation. Such fruits are called false fruits.

  1. A and R are true and R is the correct explanation of A

  2. A and R are true and R is not the correct explanation of A

  3. A is true R is false

  4. A is false, R is true
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
All fruits are not real or true fruits as some fruits like apples show the involvement of thalamus or other tissues in formation of the edible bulk of the fruit. They are called false fruits. False fruits usually develop from an inferior ovary.
So, the correct answer is 'A and R are true and R is the correct explanation of A'