Assertion (A):
In frog, grey crescent is formed during fertilization.
Reason (R):
It is because the black granules move towards the point of entry of the sperm in animal half.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Frogs: Anatomy (Female Reproductive System) |
 61%
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Adult frog (Rana tigrina) cannot respire through
1. Moist skin
2. Lungs
3. Gills
4. Buccal cavity
Subtopic: Â Frogs: Anatomy (Respiratory System) |
 87%
From NCERT
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What happens if the bone of a frog is kept in dilute hydrochloric acid?
(1) Will becomes flexible
(2) Will turn black
(3) Will break into pieces
(4) Will shrink
(1) Will becomes flexible
(2) Will turn black
(3) Will break into pieces
(4) Will shrink
Subtopic: Â Connective Tissue |
 57%
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Match each item regarding Periplaneta americana in Column I with one in Column II and select the correct match from the codes given:
Codes:
| Morphological feature | Location | ||
| A. | Sternites | P. | Ventral sclerites |
| B. | Tegmina | Q. | Dorsal sclerites |
| C. | Tergites | R. | Mesothorax |
| D. | Hind wings | S. | Metathorax |
| A | B | C | D | |
| 1. | Q | S | P | R |
| 2. | S | Q | R | P |
| 3. | P | R | Q | S |
| 4. | R | P | S | Q |
Subtopic: Â Cockroach: Intro & External Morphology |Â Cockroach: Structure of Thorax |
 88%
From NCERT
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Consider the following statements regarding cockroaches:
The number of correct statements are:
1. 2
2. 3
3. 4
4. 5
| I. | Blood transports respiratory gases |
| II. | Anal styles are absent in females |
| III. | There are 10 [5 pairs] of spiracles |
| IV. | Vision with the help of ommatidia is mosaic vision |
| V. | Development is paurometabolous |
The number of correct statements are:
1. 2
2. 3
3. 4
4. 5
Subtopic: Â Cockroach: Intro & External Morphology |Â Cockroach: Compound Eye |Â Cockroach: Female Reproductive System |
 56%
From NCERT
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The diagram shows the chief structural unit of compact (cortical) bone called:
1. Osteocyte
2. Osteoclast
3. Osteon
4. Trabeculae
1. Osteocyte
2. Osteoclast
3. Osteon
4. Trabeculae
Subtopic: Â Connective Tissue |
From NCERT
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Study the given diagram regarding the alimentary canal of cockroach and select the correct statements:
1. Only I and II
2. Only I, III and IV
3. Only II
4. Only III and IV
| I: | A is used for storing food |
| II: | B helps in grinding the food particles |
| III: | C help in osmoregulation |
| IV: | D secretes digestive enzymes |
2. Only I, III and IV
3. Only II
4. Only III and IV
Subtopic: Â Cockroach: Digestive System |
 87%
From NCERT
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Identify the incorrectly matched pair:
| 1. | Ciliated epithelium | Fallopian tubes |
| 2. | Dense irregular connective tissue | Skin |
| 3. | Nissl’s granules | Neuron |
| 4. | Smooth muscle | Intercalated disc |
Subtopic: Â Simple Epithelium |Â Compound & Specialised Epithelium |Â Cardiac Muscle & Smooth Muscle |Â Nervous Tissue |
 81%
From NCERT
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Regarding nervous system of Cockroach:
1. Most of it is held in the head region.
2. The brain is represented by sub-oesophageal ganglion
3. It is located on the dorsal side of the body
4. Compound eyes provide mosaic vision
1. Most of it is held in the head region.
2. The brain is represented by sub-oesophageal ganglion
3. It is located on the dorsal side of the body
4. Compound eyes provide mosaic vision
Subtopic: Â Cockroach: Nervous System |Â Cockroach: Compound Eye |
 59%
From NCERT
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Simple squamous epithelium is not seen in the lining of:
1. Alveoli
2. Blood capillaries
3. Loop of Henle
4. Proximal convoluted tubule of the nephron
1. Alveoli
2. Blood capillaries
3. Loop of Henle
4. Proximal convoluted tubule of the nephron
Subtopic: Â Simple Epithelium |
 81%
From NCERT
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