TLDR;
Alright, so this video is basically a crash course on the first chapter of 12th Biology, "Reproduction in Organisms." Sir Bajesh Kumar is running through 80 important objective questions, explaining the concepts along the way. Key topics include sexual and asexual reproduction, different types of reproduction (like budding, fragmentation), and some important terms like "clone" and "gametes." Plus, there's some focus on examples from both plants and animals.
- Objective questions on reproduction in organisms
- Discussion on sexual and asexual reproduction
- Explanation of key biology terms
Introduction [0:00]
Sir Bajesh Kumar welcomes everyone to Disha Science Classes and hopes everyone is doing well with their studies. He mentions that they'll be covering all the possible objective questions from Chapter 1 in one class. He also reminds students that they had a day for revision and should be ready to score 100%.
Class Start and Test Announcement [1:13]
Sir Bajesh confirms they are finishing Chapter 1 with a test before moving to Chapter 2. He asks if everyone is ready and checks the audio/video quality. He acknowledges many students in the live class and welcomes them.
Objective of the Class [2:58]
This class is for students preparing for the Bihar Board Inter exam 2026 with a focus on Biology. It's the first objective class for the chapter "Reproduction in Organisms." There are 80 objective questions selected for this class.
Instructions and Request [4:06]
Before starting, Sir Bajesh requests students to share the class and like the video. He emphasizes the importance of liking as it's like attendance. He encourages students to share the class so more students can join.
Learning from Cricket [4:59]
Sir Bajesh talks about learning from the recent cricket match, mentioning how even when star players fail, the team can still win. He connects this to the importance of continuing to strive even when facing setbacks.
Objective Questions: Sexual Reproduction [6:03]
The first question is about what happens when male and female gametes fuse, which is called fertilization and occurs in sexual reproduction. The answer is B for Biology.
Objective Questions: Asexual Reproduction [7:19]
The next question asks about the method of reproduction when offspring originate from a single parent. This is asexual reproduction. The answer is B.
Objective Questions: Clones [7:52]
The question is about clones and which statement is correct. Clones are morphologically and genetically similar to their parents. The answer is C.
Objective Questions: Cell Division in Reproduction [9:10]
This question asks in which organisms the parent cell divides into two to give rise to new organisms. This occurs in organisms belonging to Kingdom Monera and Kingdom Protista. The answer is A and B both.
Objective Questions: Binary Fission [9:48]
The question is about binary fission. Binary fission is found in Amoeba, Paramecium. The answer is A and B both.
Objective Questions: Budding [10:28]
The question is about budding. Budding is found in Yeast. The answer is A.
Objective Questions: Gemmules [10:54]
The question is about gemmules. Gemmules are formed in sponges and are asexual reproductive structures. The answer is A.
Objective Questions: Asexual Reproduction in Plants [11:10]
The question is about which structure is not involved in sexual reproduction in flowering plants. Conidia is an asexual reproductive structure and is not involved in sexual reproduction. The answer is A.
Objective Questions: Terror of Bengal [11:34]
The question is about the "Terror of Bengal." Water hyacinth is known as the Terror of Bengal because it spreads rapidly and covers water bodies, depleting oxygen. Its other name is Water Hyacinth. The answer is B.
Objective Questions: Oxygen Depletion [13:08]
The question is about which plant takes oxygen from standing water. Water hyacinth takes oxygen from the water, harming aquatic life. The answer is A.
Objective Questions: Adventitious Buds [13:41]
The question is about which plant develops adventitious buds from the edges of its leaves. Bryophyllum develops adventitious buds from leaf margins, which then develop into new plants. The answer is B.
Objective Questions: Flowering Plants [14:46]
The question is about which plant flowers only once in its lifetime. Bamboo flowers only once in its lifetime. The answer is A.
Objective Questions: 12-Year Flowering Cycle [15:19]
The question is about which plant flowers once every 12 years. Neelakurinji flowers once every 12 years and is found in the valleys of Tamil Nadu, Karnataka, and Kerala. The answer is C.
Objective Questions: Oestrous Cycle [16:53]
The question is about the oestrous cycle. The oestrous cycle is found in cows, sheep, and dogs. The answer is D.
Objective Questions: Menstrual Cycle [17:26]
The question is about the menstrual cycle. The menstrual cycle is found in humans, monkeys, and chimpanzees. The answer is D. The menstrual cycle repeats every 28 days.
Objective Questions: Gametogenesis [18:31]
The question is about what is formed in gametogenesis. In gametogenesis, both male and female gametes are formed. The answer is C.
Objective Questions: Terms for Sex [19:07]
The question is about the term used to describe a unisexual condition. The term used for a unisexual organism is "unisexual." The answer is A.
Objective Questions: Hermaphrodite Animals [20:02]
The question is about examples of hermaphrodite animals. Sponges, tapeworms, and leeches are hermaphrodites. The answer is D.
Objective Questions: Hermaphrodite Plants [20:47]
The question is about which plant is hermaphrodite. Coconut is a hermaphrodite plant. The answer is A.
Objective Questions: Chromosome Number in Gametes [21:08]
The question is about the number of chromosomes in human gametes. Gametes are haploid, meaning they have half the number of chromosomes as the parent cell. The answer is B.
Objective Questions: Chromosome Number in Maize [21:49]
The question is about the number of chromosomes in maize during meiosis. The number of chromosomes in maize during meiosis is 20. The answer is A.
Objective Questions: Haploid Plant Body [22:06]
The question is about which plant body is haploid. Algae, fungi, and bryophytes all have haploid plant bodies. The answer is D.
Objective Questions: Water Medium for Fertilization [22:35]
The question is about which plant community requires a water medium for fertilization. Bryophytes require a water medium for fertilization. The answer is B.
Objective Questions: External Fertilization [23:55]
The question is about what happens when gamete fusion occurs outside the body. When gamete fusion occurs outside the body, it is called external fertilization. The answer is A.
Objective Questions: Oviparous Animals [24:43]
The question is about which of the following are oviparous. Hens, snakes, and crocodiles are oviparous. The answer is D. Humans and bats are viviparous.
Objective Questions: Diploid Structures [26:30]
The question is about which part is diploid. The zygote is diploid. The answer is A.
Objective Questions: Haploid Structures [27:11]
The question is about which part is not haploid. The zygote is not haploid. The answer is D.
Objective Questions: Correct Statements [28:02]
The question is about which statement is not correct. The ovary develops into a seed is incorrect. The ovary develops into a fruit, and the ovule develops into a seed. The answer is B.
Objective Questions: Chromosome Number in Human Gametes [29:14]
The question is about the number of chromosomes in human gametes. The number of chromosomes is 23. The answer is A.
Objective Questions: Propagation in Onion [29:22]
The question is about propagation in onions. Onions propagate through bulbs. The answer is D.
Objective Questions: Isogametes [31:14]
The question is about isogametes. Isogametes are found in Cladophora. The answer is A.
Objective Questions: Parthenogenesis [32:14]
The question is about parthenogenesis. The term parthenogenesis was coined by Owen. The answer is A.
Objective Questions: Binary Fission in Paramecium [32:34]
The question is about binary fission in Paramecium. Paramecium exhibits transverse binary fission. The answer is A.
Objective Questions: Sexual Dimorphism [33:11]
The question is about what it is called when the male is different in shape from the female. It is called sexual dimorphism. The answer is B.
Objective Questions: Plant Production without Fertilization [34:27]
The question is about plant production without fertilization. Plant production without fertilization is done by vegetative propagation. The answer is C.
Objective Questions: Hermaphrodite Animals [35:23]
The question is about which of the following is a hermaphrodite animal. Earthworm is a hermaphrodite animal. The answer is B.
Objective Questions: Micropropagation [35:56]
The question is about what is possible in micropropagation. Asexual reproduction is possible in micropropagation. The answer is A.
Objective Questions: Diploid Structure [36:56]
The question is about which of the following is a diploid structure. Zygote is a diploid structure. The answer is C.
Objective Questions: Type of Gametes [37:40]
The question is about the type of gametes. Gametes are generally haploid. The answer is A.
Objective Questions: Reproduction in Yeast [38:12]
The question is about reproduction in yeast. Reproduction in yeast mainly occurs through budding. The answer is A.
Objective Questions: Single Parent Reproduction [38:30]
The question is about single parent reproduction. When offspring are produced by a single parent, it is called asexual reproduction. The answer is B.
Objective Questions: Vegetative Propagation in Ginger [38:38]
The question is about vegetative propagation in ginger. Vegetative propagation in ginger occurs through rhizomes. The answer is A.
Objective Questions: Haploid Plant Body [39:30]
The question is about which of the following has a haploid plant body. All of these have haploid plant bodies. The answer is D.
Objective Questions: Lifespan of a Dog [39:45]
The question is about the lifespan of a dog. The lifespan of a dog is about 20 years. The answer is A.
Objective Questions: Reproduction Phase [40:57]
The question is about what comes after puberty in animals. After puberty, the reproductive phase begins. The answer is B.
Objective Questions: Lifespan of a Parrot [41:48]
The question is about the lifespan of a parrot. The lifespan of a parrot is 140 years. The answer is C.
Objective Questions: Flowering in Bamboo [42:58]
The question is about flowering in bamboo. Bamboo flowers only once in its lifetime. The answer is A.
Objective Questions: Chromosome Number in Drosophila [43:27]
The question is about the number of chromosomes in Drosophila. The number of chromosomes in Drosophila is 8. The answer is B.
Objective Questions: Similar Gametes [45:41]
The question is about what gametes are called when they look similar. They are called isogametes. The answer is A.
Objective Questions: Lifespan of Gharial and Mayfly [46:14]
The question is about the lifespan of a gharial and mayfly. The lifespan of a gharial is 60 years, and a mayfly is 1 day. The answer is D.
Objective Questions: Nodes in Potato [47:23]
The question is about nodes in potatoes. Nodes are called eyes and are found in potatoes. The answer is B.
Objective Questions: Lifespan Definition [48:48]
The question is about the definition of lifespan. The period between birth and death is called lifespan. The answer is A.
Objective Questions: Insectivorous Plants [49:27]
The question is about insectivorous plants. Drosera and Nepenthes are insectivorous plants. The answer is D.
Objective Questions: Dioecious Plant [51:31]
The question is about which of the following is a dioecious plant. Coconut is a dioecious plant. The answer is B.
Objective Questions: Oviparous Animals [51:45]
The question is about oviparous animals. All of these are oviparous animals. The answer is D.
Objective Questions: Diploid Structure [51:53]
The question is about the diploid structure. Zygote is a diploid structure. The answer is C.
Objective Questions: Number of Male Gametes [51:56]
The question is about the number of male gametes formed from one meiosis cell division. Four male gametes are formed. The answer is D.
Objective Questions: Monocarpic Plant [54:50]
The question is about which plant flowers and fruits only once in its lifetime. It is a monocarpic plant. The answer is A.
Objective Questions: Correct Sequence [55:25]
The question is about the correct sequence of events. The correct sequence is gametogenesis, syngamy, zygote, and embryo. The answer is C.
Objective Questions: Lifespan [57:54]
The question is about the period from birth to death. It is called lifespan. The answer is A.
Objective Questions: Butterfly Lifespan [58:03]
The question is about the lifespan of a butterfly. It is one to two weeks. The answer is A.
Objective Questions: Parrot Lifespan [58:30]
The question is about the lifespan of a parrot. It is 140 years. The answer is C.
Objective Questions: Factors Affecting Reproduction [58:37]
The question is about factors affecting reproduction. Habitat and physiology both affect reproduction. The answer is C.
Objective Questions: Asexual Reproduction [58:56]
The question is about asexual reproduction. It occurs in bacteria, fungi, and protozoa. The answer is D.
Objective Questions: Clones [59:10]
The question is about clones. Clones are morphologically and genetically similar to parents. The answer is C.
Objective Questions: Lack of Reproduction [59:25]
The question is about which of the following cannot reproduce. Eunuchs, mules, and sterile worker bees cannot reproduce. The answer is D.
Objective Questions: Reproduction in Amoeba [1:00:13]
The question is about reproduction in Amoeba. It is by binary fission. The answer is A.
Objective Questions: Reproduction by Budding [1:00:41]
The question is about reproduction by budding. It occurs in yeast and hydra. The answer is C.
Objective Questions: Gemmules [1:01:09]
The question is about gemmules. They are found in sponges. The answer is A.
Objective Questions: Natural Vegetative Propagation [1:01:22]
The question is about natural vegetative propagation. It occurs by roots, stems, and leaves. The answer is D.
Objective Questions: Examples of Roots [1:02:15]
The question is about examples of roots. Radish, carrot, and turnip are examples of roots. The answer is D.
Objective Questions: Underground Stem [1:02:46]
The question is about which of the following is not an example of an underground stem. Carrot is not an example of an underground stem. The answer is C.
Objective Questions: Aerial Stem [1:03:23]
The question is about aerial stem. The answer is A.
Objective Questions: Terror of Bengal [1:04:09]
The question is about the Terror of Bengal. Water hyacinth is the Terror of Bengal. The answer is A.
Objective Questions: Vegetative Propagation by Leaves [1:04:14]
The question is about vegetative propagation by leaves. It occurs in Bryophyllum. The answer is A.
Objective Questions: Characteristics of Asexual Reproduction [1:04:25]
The question is about which of the following is not a characteristic of sexual reproduction. It is simple and fast is not a characteristic of sexual reproduction. The answer is C.
Objective Questions: Monocarpic Plants [1:05:03]
The question is about examples of monocarpic plants. Paddy, wheat and maize are examples of monocarpic plants. The answer is D.
Objective Questions: Seasonal Breeders [1:05:25]
The question is about seasonal breeders. Frogs and lizards are seasonal breeders. The answer is C.
Score Sharing and Next Class [1:06:15]
Sir Bajesh asks students to share their scores and provide feedback on the class. The next class will cover "Sexual Reproduction in Flowering Plants."
Call to Action for New Students [1:10:06]
Sir Bajesh encourages new students to join the "Manzil Batch" to avoid missing lectures and falling behind. He emphasizes the importance of consistent effort and hard work to achieve success.
