NEET 2020: We are providing here some important questions. For upcoming exam  NEET 2020 These questions are based on the topic of BIOLOGY  section REPRODUCTION IN FLOWERING PLANTS (PART ONE) which are considered important for the upcoming test. All questions are provided with correct answers.

REPRODUCTION IN FLOWERING PLANTS (PART ONE)

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Q.1)Which of the following has proved helpful in preserving pollen as fossils? 

(a) Pollenkitt 
(b) Oil content
(c) Cellulosic intine 
(d) Sporopollenin

Answer:(d) Sporopollenin

Explanation:Sporopollenin cannot be degraded by enzyme; strong acids and alkali, therefore it is helpful in preserving pollen as fossil.

Q.2) Cryopreservation means storing of products in?

(a)Liquid hydrogen 
(b) Liquid nitrogen 
(c) iquid helium 
(d)Liquid oxygen

Answer:(b) Liquid nitrogen

Explanation: Liquid N2O at-196 °C

Q.3 Select incorrect statement regarding microsporogenesis in an anther? 

(a) It consumes tapetum and middle layers  (b) Large number of microspore mother cells differentiate in one pollen sac 
(c)Each microsporogenesis involves one meiosis and two mitosis
(d) Microspore tetrads may be tetrahedral or isobilateral

Answer: (c) Each microsporogenesis involves one meiosis and two mitosis

Explanation: Microsporogenesis involve only formation of microspores by meiosis.

Q.4) Suitable environmental conditions for seed germination are? 

(a) Adequate moisture, low temperature, light 
(b) Adequate moisture, suitable temperature and oxygen 
(c) Adequate moisture, light, anaerobic conditions 
(d) Adequate moisture, suitable temperature and oxygen

Answer: (d) Adequate moisture, suitable temperature and oxygen

Explanation: Adequatic moisture and temperature 02 is needed for germination

Q.5) Pollen grains can be stored for several years in liquid nitrogen having a temperature of ? 


(a) -80°C
(b) -120°C
(c) -196°C
(d) -160°C

Answer:(c) -196°C

Explanation: Pollen grains can be stored for several years in liquid nitrogen at -196°C (Cryopreservation)

Q.6) In monoecious plant like castor and maize

(a) Geitonogamy is not prevented
(b) Geitonogamy is prevented
(c) Autogamy is not prevented
(d) Autogamy and allogamy are not prevented

Answer:(a) Geitonogamy is not prevented

Explanation:In castor and maize unisexual male and female flower are present on the same plant

Q.7) Pollen pistil interaction is?

(a) Genetically controlled process
(b) Chemically mediated process
(c) Dynamic process
(d) More than one option is correct

Answer:(d) More than one option is correct

Explanation:Chemically mediated process as well genetically controlled process.

Q.8)  Hydrophily is limited to 30 genera
which are mostly?

(a) More than one option is correct
(b)  Monocots
(c) Gymnosperms
(d) Dicots

Answer: (b) Monocots

Q.9)  The types of flowers which always produce seeds even in the absence of pollinators?

(a) Chasmogamous flowers
(b) Unisexual flowers
(c) Bisexual flowers
(d) Cleistogamous flowers

Answer:(d) Cleistogamous flowers

Explanation:Cleistogamy take place in those flower which always remain closed.

Q.10) Common floral reward provided by plants to pollinator are?

(a) Nectar and pollen
(b) Hormones and nectar
(c) Nectar and pollen
(d) All of these

Answer:(c) Nectar and pollen

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