Q. No.Which of the following hormones is secreted by implanted blastocyst, that acts on the corpus luteum in the ovary, stimulating the body to produce estrogens and progesterone to maintain the uterine lining?
(1) Estrogen
(2) HCG
(3) Progesterone
(4) Oxytocin
(1) Estrogen
Assertion : Embryonic development proves interrelationship and common ancestory of metazoans.
Reason : It involves similar sequence of five dynamic processes during development.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Assertion : There is generally monospermy in most of animals.
Reason : Vitelline membrane of ovum checks polyspermy.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Assertion : Penetration of sperm into ovum is a chemical process.
Reason : Acrosome of sperm secretes a lytic enzyme hyaluronidase which dissolves vitelline membrane of ovum.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Assertion : Cleavage is also called fractionating process.
Reason : In cleavage, number of blastomeres increases but size of blastomears decreases.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Assertion : Nuclear-cytoplasmic ratio decreases in cleavage.
Reason : During cleavage, cytoplasmic synthesis is faster than DNA synthesis.
Assertion : Implantation is the process of attachment of blastocyst on uterine endometrium.
Reason : Implantation is controlled by trophoblast and occurs by decidual cell reaction.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Assertion : Gastrular movements are morphogenetic.
Reason : During gastrulation, cells move in masses and towards definite direction.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Assertion(A): Individuals produced by asexual reproduction are genetically similar to parents.
Reason(R): Asexual reproduction involves only mitotic divisions.
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion
3. If Assertion is a true statement but Reason is false.
4. If both Assertion and Reason are false statements.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Assertion : Amoeba shows multiple fission during unfavourable conditions.
Reason : Chances of survival are less during unfavourable conditions.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
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