Science and Environment Quiz: Day 131

April 2, 2023

The period at which an organism attains sexual maturity is called ___________

(A) Puberty
(B) Adolescence
(C) Growth
(D) Maturity

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Answer : A

Anemophilous flowers have __________ .

(A) Sessile stigma
(B) Small smooth stigma
(C) Colored flower
(D) Large feathery stigma

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Answer : D

Consider the following statement:
1. During pregnancy, the corpus luteum continues to grow and produces large amount of estrogen and progesterone
2. LH is secreted by the posterior pituitary
3. Menstrual cycle ceases during pregnancy
Which of the above is/are incorrect

(A) Only 1
(B) Only 2 and 3
(C) Only 1 and 2
(D) All of these

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Answer : C

Match the following
A. Parturition 1.- Release of egg from Graafian follicle
B. Gestation 2.- Attachment of zygote to endometrium
C. Ovulation 3.- Duration between pregnancy and birth
D. Implantation 4.- Delivery of baby from uterus
Choose the correct code:

(A) A-3, B-4, C-1, D-2
(B) A-3, B-4, C-2, D-1
(C) A-4, B-3, C-1, D-2
(D) A-4, B-3, C-2, D-1

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Answer : C

The plant which propagates with the help of its leaves is ___________

(A) Onion
(B) Neem
(C) Ginger
(D) Bryophyllum

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Answer : C

The large elongated cells that provide nutrition to developing sperms are

(A) Primary germ cells
(B) Sertoli cells
(C) Leydig cells
(D) Spermatogonia

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Answer : B

The essential parts of a flower are ___________ .

(A) Calyx and Corolla
(B) Calyx and Androecium
(C) Corolla and Gynoecium
(D) Androecium and Gynoecium

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Answer : D

Which of the following statements is/are correct ?
1. Sex organs produce gametes which are Diploid
2. Surgical methods of contraception prevent gamete formation.
3. Yeast reproduces asexually by means of multiple fission.
4. Insect pollinated flowers are characterized by dry and smooth pollen.
Select the correct answer using the code given below:

(A) 1, 2 and 3
(B) 1 and 4 only
(C) 2 and 4
(D) None of These

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Answer : D

Syngamy results in the formation of _________ .

(A) Zoospores
(B) Conidia
(C) Zygote
(D) Chlamydospores

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Answer : C

Androgen production is regulated by ___________

(A) GH hormone
(B) LH hormone
(C) TSH hormone
(D) ACTH hormone

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Answer : D

Adrenocorticotrophic Hormone

Consider the following statements about light pollution
1. It is caused only by artificial light.
2. Blue light used for displays in electronic devices has no harmful impact on human health.
3. Skyglow is a form of light pollution.
Choose the correct statements using the codes given below

(A) 1 and 2 only
(B) 1 and 3 only
(C) 2 and 3 only
(D) 1, 2 and 3

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Answer : B

Which of the following statements is correct regarding the process of “bioaccumulation”?

(A) Increasing concentration of a substance, such as a toxic chemical, in the tissues of organisms at successively higher levels in a food chain.
(B) Increase of contaminant concentration in organisms following uptake from ambient environmental pollution
(C) Intake and retention of a substance in an organism entirely by respiration
(D) Natural aging of a lake by nutrient enrichment of its water

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Answer: B

Consider the following statements about Nitrogen Fixation.
1. Nitrogen Fixation is a process of converting nitrogen into nitrates.
2. During lightning nitrogen fixation occurs.
Which of the statements given above is/are correct?

(A) 1 only
(B) 2 only
(C) Both 1 and 2
(D) Neither 1 nor 2

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Answer: C

Consider the following statements regarding Biochemical Oxygen Demand
1. It refers to the amount of oxygen consumed if all the organic matter in one litre of water were oxidized by bacteria.
2. The aerobic microbes during the biological treatment of sewage decrease the amount of BOD.
3. The greater is the BOD of the waste water less is its polluting potential.
Which of the statements given above is/are correct?

(A) 1 and 3 only
(B) 1 and 2 only
(C) 2 and 3 only
(D) All of the above

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Answer : B

Which of the following organization have launched Clean Sea Campaign

(A) National Oceanic and Atmospheric Administration
(B) Ocean Conservancy
(C) UN Environment Programme
(D) None of the above

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Answer : C